GCVE Workshop - 22 September 2026 (14:00-18:00), Luxembourg Before The Vulnopticon Conference - Registration

CVE-2025-13151 (GCVE-0-2025-13151)

Vulnerability from cvelistv5 – Published: 2026-01-07 21:14 – Updated: 2026-01-20 17:08
VLAI
Title
CVE-2025-13151
Summary
Stack-based buffer overflow in libtasn1 version: v4.20.0. The function fails to validate the size of input data resulting in a buffer overflow in asn1_expend_octet_string.
Severity
7.5 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
SSVC
Exploitation: none Automatable: yes Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-01-07 21:32 UTC
CWE
Assigner
References
Impacted products
Vendor Product Version CPE status
GnuTLS libtasn1 Affected: 0 , ≤ 4.20.0 (semver)
guessed Create a notification for this product.
Credits
This issue was reported Benny Zelster from Microsoft Security Research
Show details on NVD website
To clipboard 

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "cvssV3_1": {
              "attackComplexity": "LOW",
              "attackVector": "NETWORK",
              "availabilityImpact": "HIGH",
              "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"
            }
          },
          {
            "other": {
              "content": {
                "id": "CVE-2025-13151",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "yes"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-01-07T21:32:59.782767Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-01-07T21:33:12.865Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      },
      {
        "providerMetadata": {
          "dateUpdated": "2026-01-20T17:08:41.712Z",
          "orgId": "af854a3a-2127-422b-91ae-364da2661108",
          "shortName": "CVE"
        },
        "references": [
          {
            "url": "http://www.openwall.com/lists/oss-security/2026/01/08/5"
          },
          {
            "url": "https://www.kb.cert.org/vuls/id/271649"
          }
        ],
        "title": "CVE Program Container"
      }
    ],
    "cna": {
      "affected": [
        {
          "product": "libtasn1",
          "vendor": "GnuTLS",
          "versions": [
            {
              "lessThanOrEqual": "4.20.0",
              "status": "affected",
              "version": "0",
              "versionType": "semver"
            }
          ]
        }
      ],
      "credits": [
        {
          "lang": "en",
          "type": "finder",
          "value": "This issue was reported Benny Zelster from Microsoft Security Research"
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "Stack-based buffer overflow in libtasn1 version: v4.20.0. The function fails to validate the size of input data resulting in a buffer overflow in asn1_expend_octet_string."
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "description": "CWE-120 Buffer Copy without Checking Size of Input (\u0027Classic Buffer Overflow\u0027)",
              "lang": "en"
            }
          ]
        },
        {
          "descriptions": [
            {
              "description": "CWE-121 Stack-based Buffer Overflow",
              "lang": "en"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-01-07T21:15:56.927Z",
        "orgId": "37e5125f-f79b-445b-8fad-9564f167944b",
        "shortName": "certcc"
      },
      "references": [
        {
          "name": "Source Code Respoitory",
          "url": "https://gitlab.com/gnutls/libtasn1"
        },
        {
          "name": "Proposed Pull Request",
          "tags": [
            "patch"
          ],
          "url": "https://gitlab.com/gnutls/libtasn1/-/merge_requests/121"
        }
      ],
      "source": {
        "discovery": "EXTERNAL"
      },
      "title": "CVE-2025-13151",
      "x_generator": {
        "engine": "VINCE 3.0.31",
        "env": "prod",
        "origin": "https://cveawg.mitre.org/api/cve/CVE-2025-13151"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "37e5125f-f79b-445b-8fad-9564f167944b",
    "assignerShortName": "certcc",
    "cveId": "CVE-2025-13151",
    "datePublished": "2026-01-07T21:14:05.223Z",
    "dateReserved": "2025-11-13T21:14:53.973Z",
    "dateUpdated": "2026-01-20T17:08:41.712Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2025-13151",
      "date": "2026-09-16",
      "epss": "0.01149",
      "percentile": "0.65234"
    },
    "microsoft_vex": {
      "current_release_date": "2026-02-19T01:11:53.000Z",
      "cve": "CVE-2025-13151",
      "id": "msrc_CVE-2025-13151",
      "initial_release_date": "2026-01-02T00:00:00.000Z",
      "product_status:fixed": "6",
      "product_status:known_affected": "8",
      "source": "Microsoft CSAF VEX",
      "status": "final",
      "title": "CVE-2025-13151",
      "url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2025-13151.json",
      "version": "7"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2025-13151\",\"sourceIdentifier\":\"cret@cert.org\",\"published\":\"2026-01-07T22:15:43.200\",\"lastModified\":\"2026-06-17T08:33:34.880\",\"vulnStatus\":\"Analyzed\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"Stack-based buffer overflow in libtasn1 version: v4.20.0. The function fails to validate the size of input data resulting in a buffer overflow in asn1_expend_octet_string.\"},{\"lang\":\"es\",\"value\":\"Desbordamiento de b\u00fafer basado en pila en libtasn1 versi\u00f3n: v4.20.0. La funci\u00f3n no valida el tama\u00f1o de los datos de entrada, lo que resulta en un desbordamiento de b\u00fafer en asn1_expend_octet_string.\"}],\"affected\":[{\"source\":\"cret@cert.org\",\"affectedData\":[{\"vendor\":\"GnuTLS\",\"product\":\"libtasn1\",\"versions\":[{\"version\":\"0\",\"lessThanOrEqual\":\"4.20.0\",\"versionType\":\"semver\",\"status\":\"affected\"}]}]}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"134c704f-9b21-4f2e-91b3-4a467353bcc0\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H\",\"baseScore\":7.5,\"baseSeverity\":\"HIGH\",\"attackVector\":\"NETWORK\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"NONE\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"NONE\",\"integrityImpact\":\"NONE\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":3.9,\"impactScore\":3.6}],\"ssvcV203\":[{\"source\":\"134c704f-9b21-4f2e-91b3-4a467353bcc0\",\"ssvcData\":{\"timestamp\":\"2026-01-07T21:32:59.782767Z\",\"id\":\"CVE-2025-13151\",\"options\":[{\"exploitation\":\"none\"},{\"automatable\":\"yes\"},{\"technicalImpact\":\"partial\"}],\"role\":\"CISA Coordinator\",\"version\":\"2.0.3\"}}]},\"weaknesses\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-787\"}]}],\"configurations\":[{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:gnu:libtasn1:4.20.0:*:*:*:*:*:*:*\",\"matchCriteriaId\":\"07E5B1B9-3891-490C-B148-DD952764A8A0\"}]}]}],\"references\":[{\"url\":\"https://gitlab.com/gnutls/libtasn1\",\"source\":\"cret@cert.org\",\"tags\":[\"Product\"]},{\"url\":\"https://gitlab.com/gnutls/libtasn1/-/merge_requests/121\",\"source\":\"cret@cert.org\",\"tags\":[\"Patch\"]},{\"url\":\"http://www.openwall.com/lists/oss-security/2026/01/08/5\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Mailing List\",\"Patch\"]},{\"url\":\"https://www.kb.cert.org/vuls/id/271649\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Third Party Advisory\"]}]}}",
    "redhat_vex": {
      "aggregate_severity": "Low",
      "current_release_date": "2026-09-01T12:09:08+00:00",
      "cve": "CVE-2025-13151",
      "id": "CVE-2025-13151",
      "initial_release_date": "2025-01-01T00:00:00+00:00",
      "product_status:fixed": "144",
      "product_status:known_affected": "10",
      "product_status:known_not_affected": "1",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "libtasn1: libtasn1: Denial of Service via stack-based buffer overflow in asn1_expend_octet_string",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2025/cve-2025-13151.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-08-30T02:07:32Z",
      "cve": "CVE-2025-13151",
      "id": "CVE-2025-13151",
      "initial_release_date": "2026-01-09T00:34:04Z",
      "product_status:known_affected": "514",
      "product_status:recommended": "112",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2025-13151",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2025-13151.json",
      "version": "30"
    },
    "vulnrichment": {
      "containers": "{\"adp\": [{\"title\": \"CVE Program Container\", \"references\": [{\"url\": \"http://www.openwall.com/lists/oss-security/2026/01/08/5\"}, {\"url\": \"https://www.kb.cert.org/vuls/id/271649\"}], \"providerMetadata\": {\"orgId\": \"af854a3a-2127-422b-91ae-364da2661108\", \"shortName\": \"CVE\", \"dateUpdated\": \"2026-01-20T17:08:41.712Z\"}}, {\"title\": \"CISA ADP Vulnrichment\", \"metrics\": [{\"cvssV3_1\": {\"scope\": \"UNCHANGED\", \"version\": \"3.1\", \"baseScore\": 7.5, \"attackVector\": \"NETWORK\", \"baseSeverity\": \"HIGH\", \"vectorString\": \"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H\", \"integrityImpact\": \"NONE\", \"userInteraction\": \"NONE\", \"attackComplexity\": \"LOW\", \"availabilityImpact\": \"HIGH\", \"privilegesRequired\": \"NONE\", \"confidentialityImpact\": \"NONE\"}}, {\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2025-13151\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"none\"}, {\"Automatable\": \"yes\"}, {\"Technical Impact\": \"partial\"}], \"version\": \"2.0.3\", \"timestamp\": \"2026-01-07T21:32:59.782767Z\"}}}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2026-01-07T21:32:37.425Z\"}}], \"cna\": {\"title\": \"CVE-2025-13151\", \"source\": {\"discovery\": \"EXTERNAL\"}, \"credits\": [{\"lang\": \"en\", \"type\": \"finder\", \"value\": \"This issue was reported Benny Zelster from Microsoft Security Research\"}], \"affected\": [{\"vendor\": \"GnuTLS\", \"product\": \"libtasn1\", \"versions\": [{\"status\": \"affected\", \"version\": \"0\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"4.20.0\"}]}], \"references\": [{\"url\": \"https://gitlab.com/gnutls/libtasn1\", \"name\": \"Source Code Respoitory\"}, {\"url\": \"https://gitlab.com/gnutls/libtasn1/-/merge_requests/121\", \"name\": \"Proposed Pull Request\", \"tags\": [\"patch\"]}], \"x_generator\": {\"env\": \"prod\", \"engine\": \"VINCE 3.0.31\", \"origin\": \"https://cveawg.mitre.org/api/cve/CVE-2025-13151\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"Stack-based buffer overflow in libtasn1 version: v4.20.0. The function fails to validate the size of input data resulting in a buffer overflow in asn1_expend_octet_string.\"}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"description\": \"CWE-120 Buffer Copy without Checking Size of Input (\u0027Classic Buffer Overflow\u0027)\"}]}, {\"descriptions\": [{\"lang\": \"en\", \"description\": \"CWE-121 Stack-based Buffer Overflow\"}]}], \"providerMetadata\": {\"orgId\": \"37e5125f-f79b-445b-8fad-9564f167944b\", \"shortName\": \"certcc\", \"dateUpdated\": \"2026-01-07T21:15:56.927Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2025-13151\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-01-20T17:08:41.712Z\", \"dateReserved\": \"2025-11-13T21:14:53.973Z\", \"assignerOrgId\": \"37e5125f-f79b-445b-8fad-9564f167944b\", \"datePublished\": \"2026-01-07T21:14:05.223Z\", \"assignerShortName\": \"certcc\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



Log in or create an account to share your comment.




Tags
Taxonomy of the tags.





Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.


Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.