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FKIE_CVE-2025-34468

Vulnerability from fkie_nvd - Published: 2025-12-31 19:15 - Updated: 2026-01-14 20:18

Severity ?

9.8 (Critical) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Summary

libcoap versions up to and including 4.3.5, prior to commit 30db3ea, contain a stack-based buffer overflow in address resolution when attacker-controlled hostname data is copied into a fixed 256-byte stack buffer without proper bounds checking. A remote attacker can trigger a crash and potentially achieve remote code execution depending on compiler options and runtime memory protections. Exploitation requires the proxy logic to be enabled (i.e., the proxy request handling code path in an application using libcoap).

References

URL	Tags
disclosure@vulncheck.com	https://github.com/obgm/libcoap/commit/30db3ea	Patch
disclosure@vulncheck.com	https://github.com/obgm/libcoap/pull/1737	Issue Tracking
disclosure@vulncheck.com	https://libcoap.net/	Product
disclosure@vulncheck.com	https://www.vulncheck.com/advisories/libcoap-stack-based-buffer-overflow-in-address-resolution-dos-or-potential-rce	Third Party Advisory

Impacted products

	Vendor	Product	Version
	libcoap	libcoap	*

JSON

To clipboard

{
  "configurations": [
    {
      "nodes": [
        {
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:a:libcoap:libcoap:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "22875932-4B0B-490A-AE0E-751EBC7CD54A",
              "versionEndIncluding": "4.3.5",
              "vulnerable": true
            }
          ],
          "negate": false,
          "operator": "OR"
        }
      ]
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "libcoap versions up to and including 4.3.5, prior to commit 30db3ea, contain a stack-based buffer overflow in address resolution when attacker-controlled hostname data is copied into a fixed 256-byte stack buffer without proper bounds checking. A remote attacker can trigger a crash and potentially achieve remote code execution depending on compiler options and runtime memory protections. Exploitation requires the proxy logic to be enabled (i.e., the proxy request handling code path in an application using libcoap)."
    }
  ],
  "id": "CVE-2025-34468",
  "lastModified": "2026-01-14T20:18:32.890",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "HIGH",
          "baseScore": 9.8,
          "baseSeverity": "CRITICAL",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 3.9,
        "impactScore": 5.9,
        "source": "nvd@nist.gov",
        "type": "Primary"
      }
    ],
    "cvssMetricV40": [
      {
        "cvssData": {
          "Automatable": "NOT_DEFINED",
          "Recovery": "NOT_DEFINED",
          "Safety": "NOT_DEFINED",
          "attackComplexity": "LOW",
          "attackRequirements": "PRESENT",
          "attackVector": "NETWORK",
          "availabilityRequirement": "NOT_DEFINED",
          "baseScore": 8.2,
          "baseSeverity": "HIGH",
          "confidentialityRequirement": "NOT_DEFINED",
          "exploitMaturity": "NOT_DEFINED",
          "integrityRequirement": "NOT_DEFINED",
          "modifiedAttackComplexity": "NOT_DEFINED",
          "modifiedAttackRequirements": "NOT_DEFINED",
          "modifiedAttackVector": "NOT_DEFINED",
          "modifiedPrivilegesRequired": "NOT_DEFINED",
          "modifiedSubAvailabilityImpact": "NOT_DEFINED",
          "modifiedSubConfidentialityImpact": "NOT_DEFINED",
          "modifiedSubIntegrityImpact": "NOT_DEFINED",
          "modifiedUserInteraction": "NOT_DEFINED",
          "modifiedVulnAvailabilityImpact": "NOT_DEFINED",
          "modifiedVulnConfidentialityImpact": "NOT_DEFINED",
          "modifiedVulnIntegrityImpact": "NOT_DEFINED",
          "privilegesRequired": "NONE",
          "providerUrgency": "NOT_DEFINED",
          "subAvailabilityImpact": "NONE",
          "subConfidentialityImpact": "NONE",
          "subIntegrityImpact": "NONE",
          "userInteraction": "NONE",
          "valueDensity": "NOT_DEFINED",
          "vectorString": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X",
          "version": "4.0",
          "vulnAvailabilityImpact": "HIGH",
          "vulnConfidentialityImpact": "NONE",
          "vulnIntegrityImpact": "NONE",
          "vulnerabilityResponseEffort": "NOT_DEFINED"
        },
        "source": "disclosure@vulncheck.com",
        "type": "Secondary"
      }
    ]
  },
  "published": "2025-12-31T19:15:43.923",
  "references": [
    {
      "source": "disclosure@vulncheck.com",
      "tags": [
        "Patch"
      ],
      "url": "https://github.com/obgm/libcoap/commit/30db3ea"
    },
    {
      "source": "disclosure@vulncheck.com",
      "tags": [
        "Issue Tracking"
      ],
      "url": "https://github.com/obgm/libcoap/pull/1737"
    },
    {
      "source": "disclosure@vulncheck.com",
      "tags": [
        "Product"
      ],
      "url": "https://libcoap.net/"
    },
    {
      "source": "disclosure@vulncheck.com",
      "tags": [
        "Third Party Advisory"
      ],
      "url": "https://www.vulncheck.com/advisories/libcoap-stack-based-buffer-overflow-in-address-resolution-dos-or-potential-rce"
    }
  ],
  "sourceIdentifier": "disclosure@vulncheck.com",
  "vulnStatus": "Analyzed",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-121"
        }
      ],
      "source": "disclosure@vulncheck.com",
      "type": "Primary"
    },
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-787"
        }
      ],
      "source": "nvd@nist.gov",
      "type": "Primary"
    }
  ]
}

FKIE_CVE-2025-59391

Vulnerability from fkie_nvd - Published: 2025-12-08 17:16 - Updated: 2025-12-12 12:34

Severity ?

6.5 (Medium) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:L

Summary

A memory disclosure vulnerability exists in libcoap's OSCORE configuration parser in libcoap before release-4.3.5-patches. An out-of-bounds read may occur when parsing certain configuration values, allowing an attacker to infer or read memory beyond string boundaries in the .rodata section. This could potentially lead to information disclosure or denial of service.

References

	URL	Tags
	cve@mitre.org	https://github.com/obgm/libcoap/pull/1730	Issue Tracking, Patch
	cve@mitre.org	https://github.com/obgm/libcoap/releases/tag/v4.3.5a	Release Notes

Impacted products

	Vendor	Product	Version
	libcoap	libcoap	*

JSON

To clipboard

{
  "configurations": [
    {
      "nodes": [
        {
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:a:libcoap:libcoap:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "8519F781-B2B5-48CA-BE86-B187221928B6",
              "versionEndExcluding": "4.3.5a",
              "vulnerable": true
            }
          ],
          "negate": false,
          "operator": "OR"
        }
      ]
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "A memory disclosure vulnerability exists in libcoap\u0027s OSCORE configuration parser in libcoap before release-4.3.5-patches. An out-of-bounds read may occur when parsing certain configuration values, allowing an attacker to infer or read memory beyond string boundaries in the .rodata section. This could potentially lead to information disclosure or denial of service."
    }
  ],
  "id": "CVE-2025-59391",
  "lastModified": "2025-12-12T12:34:00.573",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "LOW",
          "baseScore": 6.5,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "LOW",
          "integrityImpact": "NONE",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:L",
          "version": "3.1"
        },
        "exploitabilityScore": 3.9,
        "impactScore": 2.5,
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "type": "Secondary"
      }
    ]
  },
  "published": "2025-12-08T17:16:20.080",
  "references": [
    {
      "source": "cve@mitre.org",
      "tags": [
        "Issue Tracking",
        "Patch"
      ],
      "url": "https://github.com/obgm/libcoap/pull/1730"
    },
    {
      "source": "cve@mitre.org",
      "tags": [
        "Release Notes"
      ],
      "url": "https://github.com/obgm/libcoap/releases/tag/v4.3.5a"
    }
  ],
  "sourceIdentifier": "cve@mitre.org",
  "vulnStatus": "Analyzed",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-125"
        }
      ],
      "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
      "type": "Secondary"
    }
  ]
}

FKIE_CVE-2025-65499

Vulnerability from fkie_nvd - Published: 2025-11-24 14:15 - Updated: 2025-12-01 16:29

Severity ?

4.3 (Medium) - CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L

Summary

Array index error in tls_verify_call_back() in src/coap_openssl.c in OISM libcoap 4.3.5 allows remote attackers to cause a denial of service via a crafted DTLS handshake that triggers SSL_get_ex_data_X509_STORE_CTX_idx() to return -1.

References

	URL	Tags
	cve@mitre.org	https://github.com/obgm/libcoap/issues/1747	Issue Tracking
	cve@mitre.org	https://github.com/obgm/libcoap/pull/1750	Issue Tracking, Patch

Impacted products

	Vendor	Product	Version
	libcoap	libcoap	4.3.5

JSON

To clipboard

{
  "configurations": [
    {
      "nodes": [
        {
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:a:libcoap:libcoap:4.3.5:*:*:*:*:*:*:*",
              "matchCriteriaId": "774891BC-C4E5-404A-B2C7-8603769C5B81",
              "vulnerable": true
            }
          ],
          "negate": false,
          "operator": "OR"
        }
      ]
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "Array index error in tls_verify_call_back() in src/coap_openssl.c in OISM libcoap 4.3.5 allows remote attackers to cause a denial of service via a crafted DTLS handshake that triggers SSL_get_ex_data_X509_STORE_CTX_idx() to return -1."
    }
  ],
  "id": "CVE-2025-65499",
  "lastModified": "2025-12-01T16:29:53.680",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "LOW",
          "baseScore": 4.3,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "NONE",
          "integrityImpact": "NONE",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "REQUIRED",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L",
          "version": "3.1"
        },
        "exploitabilityScore": 2.8,
        "impactScore": 1.4,
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "type": "Secondary"
      }
    ]
  },
  "published": "2025-11-24T14:15:47.643",
  "references": [
    {
      "source": "cve@mitre.org",
      "tags": [
        "Issue Tracking"
      ],
      "url": "https://github.com/obgm/libcoap/issues/1747"
    },
    {
      "source": "cve@mitre.org",
      "tags": [
        "Issue Tracking",
        "Patch"
      ],
      "url": "https://github.com/obgm/libcoap/pull/1750"
    }
  ],
  "sourceIdentifier": "cve@mitre.org",
  "vulnStatus": "Analyzed",
  "weaknesses": [
    {
      "description": [
        {
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          "value": "CWE-129"
        }
      ],
      "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
      "type": "Secondary"
    }
  ]
}

FKIE_CVE-2025-65496

Vulnerability from fkie_nvd - Published: 2025-11-24 14:15 - Updated: 2025-12-01 17:00

Severity ?

4.3 (Medium) - CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L

Summary

NULL pointer dereference in coap_dtls_generate_cookie() in src/coap_openssl.c in OISM libcoap 4.3.5 allows remote attackers to cause a denial of service via a crafted DTLS handshake that triggers SSL_get_SSL_CTX() to return NULL.

References

	URL	Tags
	cve@mitre.org	https://github.com/obgm/libcoap/issues/1745	Issue Tracking
	cve@mitre.org	https://github.com/obgm/libcoap/pull/1750	Issue Tracking, Patch

Impacted products

	Vendor	Product	Version
	libcoap	libcoap	4.3.5

JSON

To clipboard

{
  "configurations": [
    {
      "nodes": [
        {
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:a:libcoap:libcoap:4.3.5:-:*:*:*:*:*:*",
              "matchCriteriaId": "78120234-9F76-4010-AD0E-FEA4DE8A76F9",
              "vulnerable": true
            }
          ],
          "negate": false,
          "operator": "OR"
        }
      ]
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "NULL pointer dereference in coap_dtls_generate_cookie() in src/coap_openssl.c in OISM libcoap 4.3.5 allows remote attackers to cause a denial of service via a crafted DTLS handshake that triggers SSL_get_SSL_CTX() to return NULL."
    }
  ],
  "id": "CVE-2025-65496",
  "lastModified": "2025-12-01T17:00:40.420",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "LOW",
          "baseScore": 4.3,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "NONE",
          "integrityImpact": "NONE",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "REQUIRED",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L",
          "version": "3.1"
        },
        "exploitabilityScore": 2.8,
        "impactScore": 1.4,
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "type": "Secondary"
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    ]
  },
  "published": "2025-11-24T14:15:47.203",
  "references": [
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      "source": "cve@mitre.org",
      "tags": [
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      "url": "https://github.com/obgm/libcoap/issues/1745"
    },
    {
      "source": "cve@mitre.org",
      "tags": [
        "Issue Tracking",
        "Patch"
      ],
      "url": "https://github.com/obgm/libcoap/pull/1750"
    }
  ],
  "sourceIdentifier": "cve@mitre.org",
  "vulnStatus": "Analyzed",
  "weaknesses": [
    {
      "description": [
        {
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          "value": "CWE-476"
        }
      ],
      "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
      "type": "Secondary"
    }
  ]
}

FKIE_CVE-2025-65498

Vulnerability from fkie_nvd - Published: 2025-11-24 14:15 - Updated: 2025-12-01 16:31

Severity ?

4.3 (Medium) - CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L

Summary

NULL pointer dereference in coap_dtls_generate_cookie() in src/coap_openssl.c in OISM libcoap 4.3.5 allows remote attackers to cause a denial of service via a crafted DTLS handshake that triggers SSL_get_SSL_CTX() to return NULL.

References

	URL	Tags
	cve@mitre.org	https://github.com/obgm/libcoap/issues/1746	Issue Tracking
	cve@mitre.org	https://github.com/obgm/libcoap/pull/1750	Issue Tracking, Patch

Impacted products

	Vendor	Product	Version
	libcoap	libcoap	4.3.5

JSON

To clipboard

{
  "configurations": [
    {
      "nodes": [
        {
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:a:libcoap:libcoap:4.3.5:-:*:*:*:*:*:*",
              "matchCriteriaId": "78120234-9F76-4010-AD0E-FEA4DE8A76F9",
              "vulnerable": true
            }
          ],
          "negate": false,
          "operator": "OR"
        }
      ]
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "NULL pointer dereference in coap_dtls_generate_cookie() in src/coap_openssl.c in OISM libcoap 4.3.5 allows remote attackers to cause a denial of service via a crafted DTLS handshake that triggers SSL_get_SSL_CTX() to return NULL."
    }
  ],
  "id": "CVE-2025-65498",
  "lastModified": "2025-12-01T16:31:43.220",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "LOW",
          "baseScore": 4.3,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "NONE",
          "integrityImpact": "NONE",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "REQUIRED",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L",
          "version": "3.1"
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        "impactScore": 1.4,
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
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  "published": "2025-11-24T14:15:47.500",
  "references": [
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      "source": "cve@mitre.org",
      "tags": [
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      "url": "https://github.com/obgm/libcoap/issues/1746"
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      "source": "cve@mitre.org",
      "tags": [
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        "Patch"
      ],
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    }
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  "sourceIdentifier": "cve@mitre.org",
  "vulnStatus": "Analyzed",
  "weaknesses": [
    {
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        }
      ],
      "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
      "type": "Secondary"
    }
  ]
}

FKIE_CVE-2025-65497

Vulnerability from fkie_nvd - Published: 2025-11-24 14:15 - Updated: 2025-12-01 16:55

Severity ?

4.3 (Medium) - CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L

Summary

NULL pointer dereference in coap_dtls_generate_cookie() in src/coap_openssl.c in OISM libcoap 4.3.5 allows remote attackers to cause a denial of service via a crafted DTLS handshake that triggers SSL_get_SSL_CTX() to return NULL.

References

	URL	Tags
	cve@mitre.org	https://github.com/obgm/libcoap/issues/1745	Issue Tracking
	cve@mitre.org	https://github.com/obgm/libcoap/pull/1750	Issue Tracking, Patch

Impacted products

	Vendor	Product	Version
	libcoap	libcoap	4.3.5

JSON

To clipboard

{
  "configurations": [
    {
      "nodes": [
        {
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:a:libcoap:libcoap:4.3.5:-:*:*:*:*:*:*",
              "matchCriteriaId": "78120234-9F76-4010-AD0E-FEA4DE8A76F9",
              "vulnerable": true
            }
          ],
          "negate": false,
          "operator": "OR"
        }
      ]
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "NULL pointer dereference in coap_dtls_generate_cookie() in src/coap_openssl.c in OISM libcoap 4.3.5 allows remote attackers to cause a denial of service via a crafted DTLS handshake that triggers SSL_get_SSL_CTX() to return NULL."
    }
  ],
  "id": "CVE-2025-65497",
  "lastModified": "2025-12-01T16:55:53.163",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "LOW",
          "baseScore": 4.3,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "NONE",
          "integrityImpact": "NONE",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "REQUIRED",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L",
          "version": "3.1"
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        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
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  },
  "published": "2025-11-24T14:15:47.343",
  "references": [
    {
      "source": "cve@mitre.org",
      "tags": [
        "Issue Tracking"
      ],
      "url": "https://github.com/obgm/libcoap/issues/1745"
    },
    {
      "source": "cve@mitre.org",
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FKIE_CVE-2025-65500

Vulnerability from fkie_nvd - Published: 2025-11-24 14:15 - Updated: 2025-12-01 16:28

Severity ?

4.3 (Medium) - CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L

Summary

NULL pointer dereference in coap_dtls_generate_cookie() in src/coap_openssl.c in OISM libcoap 4.3.5 allows remote attackers to cause a denial of service via a crafted DTLS handshake that triggers SSL_get_SSL_CTX() to return NULL.

References

	URL	Tags
	cve@mitre.org	https://github.com/obgm/libcoap/issues/1746	Issue Tracking
	cve@mitre.org	https://github.com/obgm/libcoap/pull/1750	Issue Tracking, Patch

Impacted products

	Vendor	Product	Version
	libcoap	libcoap	4.3.5

JSON

To clipboard

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FKIE_CVE-2025-65495

Vulnerability from fkie_nvd - Published: 2025-11-24 14:15 - Updated: 2025-12-01 17:15

Severity ?

7.5 (High) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Summary

Integer signedness error in tls_verify_call_back() in src/coap_openssl.c in OISM libcoap 4.3.5 allows remote attackers to cause a denial of service via a crafted TLS certificate that causes i2d_X509() to return -1 and be misused as a malloc() size parameter.

References

	URL	Tags
	cve@mitre.org	https://github.com/obgm/libcoap/issues/1744	Issue Tracking
	cve@mitre.org	https://github.com/obgm/libcoap/pull/1750	Issue Tracking, Patch

Impacted products

	Vendor	Product	Version
	libcoap	libcoap	4.3.5

JSON

To clipboard

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FKIE_CVE-2025-65501

Vulnerability from fkie_nvd - Published: 2025-11-24 14:15 - Updated: 2025-12-01 16:18

Severity ?

4.3 (Medium) - CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L

Summary

Null pointer dereference in coap_dtls_info_callback() in OISM libcoap 4.3.5 allows remote attackers to cause a denial of service via a DTLS handshake where SSL_get_app_data() returns NULL.

References

	URL	Tags
	cve@mitre.org	https://github.com/obgm/libcoap/issues/1748	Issue Tracking
	cve@mitre.org	https://github.com/obgm/libcoap/pull/1750	Issue Tracking

Impacted products

	Vendor	Product	Version
	libcoap	libcoap	4.3.5

JSON

To clipboard

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FKIE_CVE-2025-65494

Vulnerability from fkie_nvd - Published: 2025-11-24 14:15 - Updated: 2025-12-01 17:17

Severity ?

7.5 (High) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Summary

NULL pointer dereference in get_san_or_cn_from_cert() in src/coap_openssl.c in OISM libcoap 4.3.5 allows remote attackers to cause a denial of service via a crafted X.509 certificate that causes sk_GENERAL_NAME_value() to return NULL.

References

	URL	Tags
	cve@mitre.org	https://github.com/obgm/libcoap/issues/1745	Issue Tracking
	cve@mitre.org	https://github.com/obgm/libcoap/pull/1750	Issue Tracking, Patch

Impacted products

	Vendor	Product	Version
	libcoap	libcoap	4.3.5

JSON

To clipboard

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FKIE_CVE-2025-65493

Vulnerability from fkie_nvd - Published: 2025-11-24 14:15 - Updated: 2025-12-01 17:38

Severity ?

7.5 (High) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Summary

NULL pointer dereference in src/coap_openssl.c in OISM libcoap 4.3.5 allows remote attackers to cause a denial of service via a crafted DTLS/TLS connection that triggers BIO_get_data() to return NULL.

References

	URL	Tags
	cve@mitre.org	https://github.com/obgm/libcoap/issues/1743	Issue Tracking
	cve@mitre.org	https://github.com/obgm/libcoap/pull/1750	Issue Tracking, Patch

Impacted products

	Vendor	Product	Version
	libcoap	libcoap	4.3.5

JSON

To clipboard

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CVE-2025-34468 (GCVE-0-2025-34468)

Vulnerability from nvd – Published: 2025-12-31 18:39 – Updated: 2026-01-02 14:36

Title

libcoap Stack-Based Buffer Overflow in Address Resolution DoS or Potential RCE

Summary

libcoap versions up to and including 4.3.5, prior to commit 30db3ea, contain a stack-based buffer overflow in address resolution when attacker-controlled hostname data is copied into a fixed 256-byte stack buffer without proper bounds checking. A remote attacker can trigger a crash and potentially achieve remote code execution depending on compiler options and runtime memory protections. Exploitation requires the proxy logic to be enabled (i.e., the proxy request handling code path in an application using libcoap).

Severity ?

8.2 (High)


                        
                          CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

CWE

CWE-121 - Stack-based Buffer Overflow

Assigner

VulnCheck

References

URL

Tags

	https://github.com/obgm/libcoap/pull/1737	issue-tracking
	https://github.com/obgm/libcoap/commit/30db3ea	patch
	https://libcoap.net/	product
	https://www.vulncheck.com/advisories/libcoap-stac…	third-party-advisory

Impacted products

	Vendor	Product	Version
	libcoap	libcoap	Affected: 0 , ≤ 4.3.5 (semver) Unaffected: commit 30db3ea

Credits

SecMate

Show details on NVD website

JSON

To clipboard

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          "url": "https://libcoap.net/"
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        {
          "tags": [
            "third-party-advisory"
          ],
          "url": "https://www.vulncheck.com/advisories/libcoap-stack-based-buffer-overflow-in-address-resolution-dos-or-potential-rce"
        }
      ],
      "source": {
        "discovery": "UNKNOWN"
      },
      "title": "libcoap Stack-Based Buffer Overflow in Address Resolution DoS or Potential RCE",
      "x_generator": {
        "engine": "Vulnogram 0.5.0"
      }
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  "cveMetadata": {
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    "assignerShortName": "VulnCheck",
    "cveId": "CVE-2025-34468",
    "datePublished": "2025-12-31T18:39:07.530Z",
    "dateReserved": "2025-04-15T19:15:22.607Z",
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CVE-2025-59391 (GCVE-0-2025-59391)

Vulnerability from nvd – Published: 2025-12-08 00:00 – Updated: 2025-12-08 17:51

Summary

A memory disclosure vulnerability exists in libcoap's OSCORE configuration parser in libcoap before release-4.3.5-patches. An out-of-bounds read may occur when parsing certain configuration values, allowing an attacker to infer or read memory beyond string boundaries in the .rodata section. This could potentially lead to information disclosure or denial of service.

Severity ?

6.5 (Medium)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:L

CWE

n/a

Assigner

mitre

References

URL

Tags

	https://github.com/obgm/libcoap/releases/tag/v4.3.5a
	https://github.com/obgm/libcoap/pull/1730

Show details on NVD website

JSON

To clipboard

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CVE-2025-65501 (GCVE-0-2025-65501)

Vulnerability from nvd – Published: 2025-11-24 00:00 – Updated: 2025-11-24 18:28

Summary

Null pointer dereference in coap_dtls_info_callback() in OISM libcoap 4.3.5 allows remote attackers to cause a denial of service via a DTLS handshake where SSL_get_app_data() returns NULL.

Severity ?

4.3 (Medium)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L

CWE

n/a

Assigner

mitre

References

URL

Tags

	https://github.com/obgm/libcoap/issues/1748
	https://github.com/obgm/libcoap/pull/1750

Show details on NVD website

JSON

To clipboard

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CVE-2025-65494 (GCVE-0-2025-65494)

Vulnerability from nvd – Published: 2025-11-24 00:00 – Updated: 2025-11-24 14:49

Summary

NULL pointer dereference in get_san_or_cn_from_cert() in src/coap_openssl.c in OISM libcoap 4.3.5 allows remote attackers to cause a denial of service via a crafted X.509 certificate that causes sk_GENERAL_NAME_value() to return NULL.

Severity ?

7.5 (High)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CWE

n/a

Assigner

mitre

References

URL

Tags

	https://github.com/obgm/libcoap/issues/1745
	https://github.com/obgm/libcoap/pull/1750

Show details on NVD website

JSON

To clipboard

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        "metrics": [
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CVE-2025-65496 (GCVE-0-2025-65496)

Vulnerability from nvd – Published: 2025-11-24 00:00 – Updated: 2025-11-24 18:26

Summary

NULL pointer dereference in coap_dtls_generate_cookie() in src/coap_openssl.c in OISM libcoap 4.3.5 allows remote attackers to cause a denial of service via a crafted DTLS handshake that triggers SSL_get_SSL_CTX() to return NULL.

Severity ?

4.3 (Medium)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L

CWE

n/a

Assigner

mitre

References

URL

Tags

	https://github.com/obgm/libcoap/issues/1745
	https://github.com/obgm/libcoap/pull/1750

Show details on NVD website

JSON

To clipboard

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  "containers": {
    "adp": [
      {
        "metrics": [
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              "attackComplexity": "LOW",
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        {
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        "dateUpdated": "2025-11-24T13:58:58.275Z",
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CVE-2025-65499 (GCVE-0-2025-65499)

Vulnerability from nvd – Published: 2025-11-24 00:00 – Updated: 2025-11-24 18:27

Summary

Array index error in tls_verify_call_back() in src/coap_openssl.c in OISM libcoap 4.3.5 allows remote attackers to cause a denial of service via a crafted DTLS handshake that triggers SSL_get_ex_data_X509_STORE_CTX_idx() to return -1.

Severity ?

4.3 (Medium)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L

CWE

n/a

Assigner

mitre

References

URL

Tags

	https://github.com/obgm/libcoap/issues/1747
	https://github.com/obgm/libcoap/pull/1750

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "cvssV3_1": {
              "attackComplexity": "LOW",
              "attackVector": "NETWORK",
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              "baseScore": 4.3,
              "baseSeverity": "MEDIUM",
              "confidentialityImpact": "NONE",
              "integrityImpact": "NONE",
              "privilegesRequired": "NONE",
              "scope": "UNCHANGED",
              "userInteraction": "REQUIRED",
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        ],
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                "cweId": "CWE-129",
                "description": "CWE-129 Improper Validation of Array Index",
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              }
            ]
          }
        ],
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          "dateUpdated": "2025-11-24T18:27:33.150Z",
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        },
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        "dateUpdated": "2025-11-24T13:59:00.315Z",
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CVE-2025-65497 (GCVE-0-2025-65497)

Vulnerability from nvd – Published: 2025-11-24 00:00 – Updated: 2025-11-24 18:26

Summary

NULL pointer dereference in coap_dtls_generate_cookie() in src/coap_openssl.c in OISM libcoap 4.3.5 allows remote attackers to cause a denial of service via a crafted DTLS handshake that triggers SSL_get_SSL_CTX() to return NULL.

Severity ?

4.3 (Medium)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L

CWE

n/a

Assigner

mitre

References

URL

Tags

	https://github.com/obgm/libcoap/issues/1745
	https://github.com/obgm/libcoap/pull/1750

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "cvssV3_1": {
              "attackComplexity": "LOW",
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CVE-2025-65493 (GCVE-0-2025-65493)

Vulnerability from nvd – Published: 2025-11-24 00:00 – Updated: 2025-11-24 14:53

Summary

NULL pointer dereference in src/coap_openssl.c in OISM libcoap 4.3.5 allows remote attackers to cause a denial of service via a crafted DTLS/TLS connection that triggers BIO_get_data() to return NULL.

Severity ?

7.5 (High)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CWE

n/a

Assigner

mitre

References

URL

Tags

	https://github.com/obgm/libcoap/issues/1743
	https://github.com/obgm/libcoap/pull/1750

Show details on NVD website

JSON

To clipboard

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CVE-2025-65498 (GCVE-0-2025-65498)

Vulnerability from nvd – Published: 2025-11-24 00:00 – Updated: 2025-11-24 18:26

Summary

NULL pointer dereference in coap_dtls_generate_cookie() in src/coap_openssl.c in OISM libcoap 4.3.5 allows remote attackers to cause a denial of service via a crafted DTLS handshake that triggers SSL_get_SSL_CTX() to return NULL.

Severity ?

4.3 (Medium)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L

CWE

n/a

Assigner

mitre

References

URL

Tags

	https://github.com/obgm/libcoap/issues/1746
	https://github.com/obgm/libcoap/pull/1750

Show details on NVD website

JSON

To clipboard

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CVE-2025-34468 (GCVE-0-2025-34468)

Vulnerability from cvelistv5 – Published: 2025-12-31 18:39 – Updated: 2026-01-02 14:36

Title

libcoap Stack-Based Buffer Overflow in Address Resolution DoS or Potential RCE

Summary

libcoap versions up to and including 4.3.5, prior to commit 30db3ea, contain a stack-based buffer overflow in address resolution when attacker-controlled hostname data is copied into a fixed 256-byte stack buffer without proper bounds checking. A remote attacker can trigger a crash and potentially achieve remote code execution depending on compiler options and runtime memory protections. Exploitation requires the proxy logic to be enabled (i.e., the proxy request handling code path in an application using libcoap).

Severity ?

8.2 (High)


                        
                          CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

CWE

CWE-121 - Stack-based Buffer Overflow

Assigner

VulnCheck

References

URL

Tags

	https://github.com/obgm/libcoap/pull/1737	issue-tracking
	https://github.com/obgm/libcoap/commit/30db3ea	patch
	https://libcoap.net/	product
	https://www.vulncheck.com/advisories/libcoap-stac…	third-party-advisory

Impacted products

	Vendor	Product	Version
	libcoap	libcoap	Affected: 0 , ≤ 4.3.5 (semver) Unaffected: commit 30db3ea

Credits

SecMate

Show details on NVD website

JSON

To clipboard

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CVE-2025-59391 (GCVE-0-2025-59391)

Vulnerability from cvelistv5 – Published: 2025-12-08 00:00 – Updated: 2025-12-08 17:51

Summary

A memory disclosure vulnerability exists in libcoap's OSCORE configuration parser in libcoap before release-4.3.5-patches. An out-of-bounds read may occur when parsing certain configuration values, allowing an attacker to infer or read memory beyond string boundaries in the .rodata section. This could potentially lead to information disclosure or denial of service.

Severity ?

6.5 (Medium)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:L

CWE

n/a

Assigner

mitre

References

URL

Tags

	https://github.com/obgm/libcoap/releases/tag/v4.3.5a
	https://github.com/obgm/libcoap/pull/1730

Show details on NVD website

JSON

To clipboard

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CVE-2025-65501 (GCVE-0-2025-65501)

Vulnerability from cvelistv5 – Published: 2025-11-24 00:00 – Updated: 2025-11-24 18:28

Summary

Null pointer dereference in coap_dtls_info_callback() in OISM libcoap 4.3.5 allows remote attackers to cause a denial of service via a DTLS handshake where SSL_get_app_data() returns NULL.

Severity ?

4.3 (Medium)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L

CWE

n/a

Assigner

mitre

References

URL

Tags

	https://github.com/obgm/libcoap/issues/1748
	https://github.com/obgm/libcoap/pull/1750

Show details on NVD website

JSON

To clipboard

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CVE-2025-65494 (GCVE-0-2025-65494)

Vulnerability from cvelistv5 – Published: 2025-11-24 00:00 – Updated: 2025-11-24 14:49

Summary

NULL pointer dereference in get_san_or_cn_from_cert() in src/coap_openssl.c in OISM libcoap 4.3.5 allows remote attackers to cause a denial of service via a crafted X.509 certificate that causes sk_GENERAL_NAME_value() to return NULL.

Severity ?

7.5 (High)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CWE

n/a

Assigner

mitre

References

URL

Tags

	https://github.com/obgm/libcoap/issues/1745
	https://github.com/obgm/libcoap/pull/1750

Show details on NVD website

JSON

To clipboard

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              "confidentialityImpact": "NONE",
              "integrityImpact": "NONE",
              "privilegesRequired": "NONE",
              "scope": "UNCHANGED",
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CVE-2025-65496 (GCVE-0-2025-65496)

Vulnerability from cvelistv5 – Published: 2025-11-24 00:00 – Updated: 2025-11-24 18:26

Summary

NULL pointer dereference in coap_dtls_generate_cookie() in src/coap_openssl.c in OISM libcoap 4.3.5 allows remote attackers to cause a denial of service via a crafted DTLS handshake that triggers SSL_get_SSL_CTX() to return NULL.

Severity ?

4.3 (Medium)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L

CWE

n/a

Assigner

mitre

References

URL

Tags

	https://github.com/obgm/libcoap/issues/1745
	https://github.com/obgm/libcoap/pull/1750

Show details on NVD website

JSON

To clipboard

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  "containers": {
    "adp": [
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              "attackComplexity": "LOW",
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              "confidentialityImpact": "NONE",
              "integrityImpact": "NONE",
              "privilegesRequired": "NONE",
              "scope": "UNCHANGED",
              "userInteraction": "REQUIRED",
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          "url": "https://github.com/obgm/libcoap/issues/1745"
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CVE-2025-65499 (GCVE-0-2025-65499)

Vulnerability from cvelistv5 – Published: 2025-11-24 00:00 – Updated: 2025-11-24 18:27

Summary

Array index error in tls_verify_call_back() in src/coap_openssl.c in OISM libcoap 4.3.5 allows remote attackers to cause a denial of service via a crafted DTLS handshake that triggers SSL_get_ex_data_X509_STORE_CTX_idx() to return -1.

Severity ?

4.3 (Medium)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L

CWE

n/a

Assigner

mitre

References

URL

Tags

	https://github.com/obgm/libcoap/issues/1747
	https://github.com/obgm/libcoap/pull/1750

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "cvssV3_1": {
              "attackComplexity": "LOW",
              "attackVector": "NETWORK",
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              "confidentialityImpact": "NONE",
              "integrityImpact": "NONE",
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            "descriptions": [
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                "cweId": "CWE-129",
                "description": "CWE-129 Improper Validation of Array Index",
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              }
            ]
          }
        ],
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          "dateUpdated": "2025-11-24T18:27:33.150Z",
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        "title": "CISA ADP Vulnrichment"
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          "lang": "en",
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          "url": "https://github.com/obgm/libcoap/issues/1747"
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CVE-2025-65497 (GCVE-0-2025-65497)

Vulnerability from cvelistv5 – Published: 2025-11-24 00:00 – Updated: 2025-11-24 18:26

Summary

NULL pointer dereference in coap_dtls_generate_cookie() in src/coap_openssl.c in OISM libcoap 4.3.5 allows remote attackers to cause a denial of service via a crafted DTLS handshake that triggers SSL_get_SSL_CTX() to return NULL.

Severity ?

4.3 (Medium)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L

CWE

n/a

Assigner

mitre

References

URL

Tags

	https://github.com/obgm/libcoap/issues/1745
	https://github.com/obgm/libcoap/pull/1750

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
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              "attackComplexity": "LOW",
              "attackVector": "NETWORK",
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CVE-2025-65493 (GCVE-0-2025-65493)

Vulnerability from cvelistv5 – Published: 2025-11-24 00:00 – Updated: 2025-11-24 14:53

Summary

NULL pointer dereference in src/coap_openssl.c in OISM libcoap 4.3.5 allows remote attackers to cause a denial of service via a crafted DTLS/TLS connection that triggers BIO_get_data() to return NULL.

Severity ?

7.5 (High)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CWE

n/a

Assigner

mitre

References

URL

Tags

	https://github.com/obgm/libcoap/issues/1743
	https://github.com/obgm/libcoap/pull/1750

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "cvssV3_1": {
              "attackComplexity": "LOW",
              "attackVector": "NETWORK",
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              "baseScore": 7.5,
              "baseSeverity": "HIGH",
              "confidentialityImpact": "NONE",
              "integrityImpact": "NONE",
              "privilegesRequired": "NONE",
              "scope": "UNCHANGED",
              "userInteraction": "NONE",
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        "providerMetadata": {
          "dateUpdated": "2025-11-24T14:53:58.026Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "product": "n/a",
          "vendor": "n/a",
          "versions": [
            {
              "status": "affected",
              "version": "n/a"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "NULL pointer dereference in src/coap_openssl.c in OISM libcoap 4.3.5 allows remote attackers to cause a denial of service via a crafted DTLS/TLS connection that triggers BIO_get_data() to return NULL."
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "description": "n/a",
              "lang": "en",
              "type": "text"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2025-11-24T13:58:50.655Z",
        "orgId": "8254265b-2729-46b6-b9e3-3dfca2d5bfca",
        "shortName": "mitre"
      },
      "references": [
        {
          "url": "https://github.com/obgm/libcoap/issues/1743"
        },
        {
          "url": "https://github.com/obgm/libcoap/pull/1750"
        }
      ]
    }
  },
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    "assignerOrgId": "8254265b-2729-46b6-b9e3-3dfca2d5bfca",
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    "cveId": "CVE-2025-65493",
    "datePublished": "2025-11-24T00:00:00.000Z",
    "dateReserved": "2025-11-18T00:00:00.000Z",
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  },
  "dataType": "CVE_RECORD",
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}

CVE-2025-65498 (GCVE-0-2025-65498)

Vulnerability from cvelistv5 – Published: 2025-11-24 00:00 – Updated: 2025-11-24 18:26

Summary

NULL pointer dereference in coap_dtls_generate_cookie() in src/coap_openssl.c in OISM libcoap 4.3.5 allows remote attackers to cause a denial of service via a crafted DTLS handshake that triggers SSL_get_SSL_CTX() to return NULL.

Severity ?

4.3 (Medium)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L

CWE

n/a

Assigner

mitre

References

URL

Tags

	https://github.com/obgm/libcoap/issues/1746
	https://github.com/obgm/libcoap/pull/1750

Show details on NVD website

JSON

To clipboard

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  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "cvssV3_1": {
              "attackComplexity": "LOW",
              "attackVector": "NETWORK",
              "availabilityImpact": "LOW",
              "baseScore": 4.3,
              "baseSeverity": "MEDIUM",
              "confidentialityImpact": "NONE",
              "integrityImpact": "NONE",
              "privilegesRequired": "NONE",
              "scope": "UNCHANGED",
              "userInteraction": "REQUIRED",
              "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L",
              "version": "3.1"
            }
          },
          {
            "other": {
              "content": {
                "id": "CVE-2025-65498",
                "options": [
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                    "Exploitation": "none"
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                    "Technical Impact": "partial"
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                ],
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                "timestamp": "2025-11-24T18:25:52.920041Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "problemTypes": [
          {
            "descriptions": [
              {
                "cweId": "CWE-476",
                "description": "CWE-476 NULL Pointer Dereference",
                "lang": "en",
                "type": "CWE"
              }
            ]
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2025-11-24T18:26:02.539Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "product": "n/a",
          "vendor": "n/a",
          "versions": [
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      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "NULL pointer dereference in coap_dtls_generate_cookie() in src/coap_openssl.c in OISM libcoap 4.3.5 allows remote attackers to cause a denial of service via a crafted DTLS handshake that triggers SSL_get_SSL_CTX() to return NULL."
        }
      ],
      "problemTypes": [
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        "dateUpdated": "2025-11-24T13:59:00.377Z",
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      "references": [
        {
          "url": "https://github.com/obgm/libcoap/issues/1746"
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          "url": "https://github.com/obgm/libcoap/pull/1750"
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CVE-2025-65495 (GCVE-0-2025-65495)

Vulnerability from cvelistv5 – Published: 2025-11-24 00:00 – Updated: 2025-11-24 14:41

Summary

Integer signedness error in tls_verify_call_back() in src/coap_openssl.c in OISM libcoap 4.3.5 allows remote attackers to cause a denial of service via a crafted TLS certificate that causes i2d_X509() to return -1 and be misused as a malloc() size parameter.

Severity ?

7.5 (High)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CWE

n/a

Assigner

mitre

References

URL

Tags

	https://github.com/obgm/libcoap/issues/1744
	https://github.com/obgm/libcoap/pull/1750

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "cvssV3_1": {
              "attackComplexity": "LOW",
              "attackVector": "NETWORK",
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              "baseScore": 7.5,
              "baseSeverity": "HIGH",
              "confidentialityImpact": "NONE",
              "integrityImpact": "NONE",
              "privilegesRequired": "NONE",
              "scope": "UNCHANGED",
              "userInteraction": "NONE",
              "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
              "version": "3.1"
            }
          },
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              "content": {
                "id": "CVE-2025-65495",
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                    "Technical Impact": "partial"
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                "timestamp": "2025-11-24T14:39:26.552727Z",
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            }
          }
        ],
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              {
                "cweId": "CWE-195",
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            ]
          }
        ],
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          "dateUpdated": "2025-11-24T14:41:15.867Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
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        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
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      "affected": [
        {
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      ],
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        {
          "lang": "en",
          "value": "Integer signedness error in tls_verify_call_back() in src/coap_openssl.c in OISM libcoap 4.3.5 allows remote attackers to cause a denial of service via a crafted TLS certificate that causes i2d_X509() to return -1 and be misused as a malloc() size parameter."
        }
      ],
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        "dateUpdated": "2025-11-24T13:58:57.268Z",
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          "url": "https://github.com/obgm/libcoap/issues/1744"
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        {
          "url": "https://github.com/obgm/libcoap/pull/1750"
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  },
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}

Search criteria

45 vulnerabilities found for libcoap by libcoap

CVE-2025-34468 (GCVE-0-2025-34468)

CVE-2025-59391 (GCVE-0-2025-59391)

CVE-2025-65501 (GCVE-0-2025-65501)

CVE-2025-65494 (GCVE-0-2025-65494)

CVE-2025-65496 (GCVE-0-2025-65496)

CVE-2025-65499 (GCVE-0-2025-65499)

CVE-2025-65497 (GCVE-0-2025-65497)

CVE-2025-65493 (GCVE-0-2025-65493)

CVE-2025-65498 (GCVE-0-2025-65498)

CVE-2025-34468 (GCVE-0-2025-34468)

CVE-2025-59391 (GCVE-0-2025-59391)

CVE-2025-65501 (GCVE-0-2025-65501)

CVE-2025-65494 (GCVE-0-2025-65494)

CVE-2025-65496 (GCVE-0-2025-65496)

CVE-2025-65499 (GCVE-0-2025-65499)

CVE-2025-65497 (GCVE-0-2025-65497)

CVE-2025-65493 (GCVE-0-2025-65493)

CVE-2025-65498 (GCVE-0-2025-65498)

CVE-2025-65495 (GCVE-0-2025-65495)