Vulnerability-Lookup

UBUNTU-CVE-2020-37127 (CVE-2020-37127)

Vulnerability from osv_ubuntu – Published: 2026-02-05 17:16 – Updated: 2026-05-27 16:31 – Source website

Details

Dnsmasq-utils 2.79-1 contains a buffer overflow vulnerability in the dhcp_release utility that allows attackers to cause a denial of service by supplying excessive input. Attackers can trigger a core dump and terminate the dhcp_release process by sending a crafted input string longer than 16 characters.

Severity

5.5 (Medium)


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

6.9 (Medium)


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

N/A (UNKNOWN)

low

References

URL

Type

	https://ubuntu.com/security/CVE-2020-37127	REPORT
	https://www.cve.org/CVERecord?id=CVE-2020-37127	REPORT
	https://www.exploit-db.com/exploits/48301	REPORT
	https://launchpad.net/ubuntu/+source/dnsmasq/2.79-1	REPORT
	https://www.vulncheck.com/advisories/dnsmasq-util…	REPORT
	https://ubuntu.com/security/notices/USN-8311-1	ADVISORY

JSON

To clipboard

{
  "affected": [
    {
      "ecosystem_specific": {
        "availability": "Available with Ubuntu Pro with Legacy support add-on: https://ubuntu.com/pro",
        "binaries": [
          {
            "binary_name": "dnsmasq",
            "binary_version": "2.68-1ubuntu0.2+esm6"
          },
          {
            "binary_name": "dnsmasq-base",
            "binary_version": "2.68-1ubuntu0.2+esm6"
          },
          {
            "binary_name": "dnsmasq-utils",
            "binary_version": "2.68-1ubuntu0.2+esm6"
          }
        ],
        "priority_reason": "Denial of service in command line tool"
      },
      "package": {
        "ecosystem": "Ubuntu:Pro:14.04:LTS",
        "name": "dnsmasq",
        "purl": "pkg:deb/ubuntu/dnsmasq@2.68-1ubuntu0.2+esm6?arch=source\u0026distro=esm-infra-legacy/trusty"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "2.68-1ubuntu0.2+esm6"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "2.66-4ubuntu1",
        "2.67-1",
        "2.68-1",
        "2.68-1ubuntu0.1",
        "2.68-1ubuntu0.2",
        "2.68-1ubuntu0.2+esm1",
        "2.68-1ubuntu0.2+esm2",
        "2.68-1ubuntu0.2+esm3",
        "2.68-1ubuntu0.2+esm5"
      ]
    },
    {
      "ecosystem_specific": {
        "availability": "Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro",
        "binaries": [
          {
            "binary_name": "dnsmasq",
            "binary_version": "2.90-0ubuntu0.18.04.1+esm1"
          },
          {
            "binary_name": "dnsmasq-base",
            "binary_version": "2.90-0ubuntu0.18.04.1+esm1"
          },
          {
            "binary_name": "dnsmasq-base-lua",
            "binary_version": "2.90-0ubuntu0.18.04.1+esm1"
          },
          {
            "binary_name": "dnsmasq-utils",
            "binary_version": "2.90-0ubuntu0.18.04.1+esm1"
          }
        ],
        "priority_reason": "Denial of service in command line tool"
      },
      "package": {
        "ecosystem": "Ubuntu:Pro:18.04:LTS",
        "name": "dnsmasq",
        "purl": "pkg:deb/ubuntu/dnsmasq@2.90-0ubuntu0.18.04.1+esm1?arch=source\u0026distro=esm-infra/bionic"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "2.90-0ubuntu0.18.04.1+esm1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "2.78-1",
        "2.78-3",
        "2.79-1",
        "2.79-1ubuntu0.2",
        "2.79-1ubuntu0.3",
        "2.79-1ubuntu0.4",
        "2.79-1ubuntu0.5",
        "2.79-1ubuntu0.6",
        "2.79-1ubuntu0.7"
      ]
    },
    {
      "ecosystem_specific": {
        "availability": "No subscription required",
        "binaries": [
          {
            "binary_name": "dnsmasq",
            "binary_version": "2.90-0ubuntu0.22.04.1"
          },
          {
            "binary_name": "dnsmasq-base",
            "binary_version": "2.90-0ubuntu0.22.04.1"
          },
          {
            "binary_name": "dnsmasq-base-lua",
            "binary_version": "2.90-0ubuntu0.22.04.1"
          },
          {
            "binary_name": "dnsmasq-utils",
            "binary_version": "2.90-0ubuntu0.22.04.1"
          }
        ],
        "priority_reason": "Denial of service in command line tool"
      },
      "package": {
        "ecosystem": "Ubuntu:22.04:LTS",
        "name": "dnsmasq",
        "purl": "pkg:deb/ubuntu/dnsmasq@2.90-0ubuntu0.22.04.1?arch=source\u0026distro=jammy"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "2.90-0ubuntu0.22.04.1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "2.85-1ubuntu2",
        "2.86-1.1",
        "2.86-1.1ubuntu0.1",
        "2.86-1.1ubuntu0.2",
        "2.86-1.1ubuntu0.3",
        "2.86-1.1ubuntu0.4",
        "2.86-1.1ubuntu0.5"
      ]
    }
  ],
  "aliases": [],
  "details": "Dnsmasq-utils 2.79-1 contains a buffer overflow vulnerability in the dhcp_release utility that allows attackers to cause a denial of service by supplying excessive input. Attackers can trigger a core dump and terminate the dhcp_release process by sending a crafted input string longer than 16 characters.",
  "id": "UBUNTU-CVE-2020-37127",
  "modified": "2026-05-27T16:31:43Z",
  "published": "2026-02-05T17:16:00Z",
  "references": [
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2020-37127"
    },
    {
      "type": "REPORT",
      "url": "https://www.cve.org/CVERecord?id=CVE-2020-37127"
    },
    {
      "type": "REPORT",
      "url": "https://www.exploit-db.com/exploits/48301"
    },
    {
      "type": "REPORT",
      "url": "https://launchpad.net/ubuntu/+source/dnsmasq/2.79-1"
    },
    {
      "type": "REPORT",
      "url": "https://www.vulncheck.com/advisories/dnsmasq-utils-dhcprelease-denial-of-service"
    },
    {
      "type": "ADVISORY",
      "url": "https://ubuntu.com/security/notices/USN-8311-1"
    }
  ],
  "related": [
    "USN-8311-1"
  ],
  "schema_version": "1.7.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    },
    {
      "score": "CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N",
      "type": "CVSS_V4"
    },
    {
      "score": "low",
      "type": "Ubuntu"
    }
  ],
  "upstream": [
    "CVE-2020-37127"
  ]
}

CVE-2020-37127 (GCVE-0-2020-37127)

Vulnerability from cvelistv5 – Published: 2026-02-05 16:13 – Updated: 2026-02-05 21:18

Title

dnsmasq-utils 2.79-1 - 'dhcp_release' Denial of Service

Summary

Severity

6.9 (Medium)


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

5.5 (Medium)


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

SSVC

Exploitation: poc Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-02-05 21:17 UTC

CWE

CWE-121 - Stack-based Buffer Overflow

Assigner

VulnCheck mitre root

References

3 references

URL	Tags
https://www.exploit-db.com/exploits/48301	exploit
https://launchpad.net/ubuntu/+source/dnsmasq/2.79-1	product
https://www.vulncheck.com/advisories/dnsmasq-util…	third-party-advisory

Impacted products

1 product

Vendor	Product	Version
dnsmasq	dnsmasq-utils	Affected: 2.79

Date Public

2020-04-06 00:00

Credits

Josue Encinar

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2020-37127",
                "options": [
                  {
                    "Exploitation": "poc"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-02-05T21:17:56.603637Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-02-05T21:18:03.656Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "dnsmasq-utils",
          "vendor": "dnsmasq",
          "versions": [
            {
              "status": "affected",
              "version": "2.79"
            }
          ]
        }
      ],
      "credits": [
        {
          "lang": "en",
          "type": "finder",
          "value": "Josue Encinar"
        }
      ],
      "datePublic": "2020-04-06T00:00:00.000Z",
      "descriptions": [
        {
          "lang": "en",
          "supportingMedia": [
            {
              "base64": false,
              "type": "text/html",
              "value": "\u003cp\u003eDnsmasq-utils 2.79-1 contains a buffer overflow vulnerability in the dhcp_release utility that allows attackers to cause a denial of service by supplying excessive input. Attackers can trigger a core dump and terminate the dhcp_release process by sending a crafted input string longer than 16 characters.\u003c/p\u003e"
            }
          ],
          "value": "Dnsmasq-utils 2.79-1 contains a buffer overflow vulnerability in the dhcp_release utility that allows attackers to cause a denial of service by supplying excessive input. Attackers can trigger a core dump and terminate the dhcp_release process by sending a crafted input string longer than 16 characters."
        }
      ],
      "metrics": [
        {
          "cvssV4_0": {
            "Automatable": "NOT_DEFINED",
            "Recovery": "NOT_DEFINED",
            "Safety": "NOT_DEFINED",
            "attackComplexity": "LOW",
            "attackRequirements": "NONE",
            "attackVector": "LOCAL",
            "baseScore": 6.9,
            "baseSeverity": "MEDIUM",
            "exploitMaturity": "NOT_DEFINED",
            "privilegesRequired": "NONE",
            "providerUrgency": "NOT_DEFINED",
            "subAvailabilityImpact": "NONE",
            "subConfidentialityImpact": "NONE",
            "subIntegrityImpact": "NONE",
            "userInteraction": "NONE",
            "valueDensity": "NOT_DEFINED",
            "vectorString": "CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N",
            "version": "4.0",
            "vulnAvailabilityImpact": "HIGH",
            "vulnConfidentialityImpact": "NONE",
            "vulnIntegrityImpact": "NONE",
            "vulnerabilityResponseEffort": "NOT_DEFINED"
          },
          "format": "CVSS",
          "scenarios": [
            {
              "lang": "en",
              "value": "GENERAL"
            }
          ]
        },
        {
          "cvssV3_1": {
            "attackComplexity": "LOW",
            "attackVector": "LOCAL",
            "availabilityImpact": "HIGH",
            "baseScore": 5.5,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "NONE",
            "integrityImpact": "NONE",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "REQUIRED",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H",
            "version": "3.1"
          },
          "format": "CVSS",
          "scenarios": [
            {
              "lang": "en",
              "value": "GENERAL"
            }
          ]
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-121",
              "description": "Stack-based Buffer Overflow",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-02-05T19:14:35.230Z",
        "orgId": "83251b91-4cc7-4094-a5c7-464a1b83ea10",
        "shortName": "VulnCheck"
      },
      "references": [
        {
          "name": "ExploitDB-48301",
          "tags": [
            "exploit"
          ],
          "url": "https://www.exploit-db.com/exploits/48301"
        },
        {
          "name": "Software Link for dnsmasq 2.79-1",
          "tags": [
            "product"
          ],
          "url": "https://launchpad.net/ubuntu/+source/dnsmasq/2.79-1"
        },
        {
          "name": "VulnCheck Advisory: dnsmasq-utils 2.79-1 - \u0027dhcp_release\u0027 Denial of Service",
          "tags": [
            "third-party-advisory"
          ],
          "url": "https://www.vulncheck.com/advisories/dnsmasq-utils-dhcprelease-denial-of-service"
        }
      ],
      "source": {
        "discovery": "UNKNOWN"
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    "datePublished": "2026-02-05T16:13:33.718Z",
    "dateReserved": "2026-02-03T16:27:45.305Z",
    "dateUpdated": "2026-02-05T21:18:03.656Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

USN-8311-1 (UBUNTU-CVE-2020-37127)

Vulnerability from osv_ubuntu – Published: 2026-05-26 19:11 – Updated: 2026-05-26 19:11 – Source website

Summary

dnsmasq vulnerability

Details

Petr Menšík discovered that Dnsmasq incorrectly handled certain input in the dhcp_release utility. A local attacker could possibly use this issue to cause Dnsmasq to crash, resulting in a denial of service.

References

URL

Type

	https://ubuntu.com/security/notices/USN-8311-1	ADVISORY
	https://ubuntu.com/security/CVE-2020-37127	REPORT

JSON

To clipboard

{
  "affected": [
    {
      "database_specific": {
        "cves_map": {
          "cves": [
            {
              "id": "CVE-2020-37127",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H",
                  "type": "CVSS_V3"
                },
                {
                  "score": "CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N",
                  "type": "CVSS_V4"
                },
                {
                  "score": "low",
                  "type": "Ubuntu"
                }
              ]
            }
          ],
          "ecosystem": "Ubuntu:Pro:14.04:LTS"
        }
      },
      "ecosystem_specific": {
        "availability": "Available with Ubuntu Pro with Legacy support add-on: https://ubuntu.com/pro",
        "binaries": [
          {
            "binary_name": "dnsmasq",
            "binary_version": "2.68-1ubuntu0.2+esm6"
          },
          {
            "binary_name": "dnsmasq-base",
            "binary_version": "2.68-1ubuntu0.2+esm6"
          },
          {
            "binary_name": "dnsmasq-utils",
            "binary_version": "2.68-1ubuntu0.2+esm6"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:Pro:14.04:LTS",
        "name": "dnsmasq",
        "purl": "pkg:deb/ubuntu/dnsmasq@2.68-1ubuntu0.2+esm6?arch=source\u0026distro=esm-infra-legacy/trusty"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "2.68-1ubuntu0.2+esm6"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "2.66-4ubuntu1",
        "2.67-1",
        "2.68-1",
        "2.68-1ubuntu0.1",
        "2.68-1ubuntu0.2",
        "2.68-1ubuntu0.2+esm1",
        "2.68-1ubuntu0.2+esm2",
        "2.68-1ubuntu0.2+esm3",
        "2.68-1ubuntu0.2+esm5"
      ]
    }
  ],
  "aliases": [],
  "details": "Petr Men\u0161\u00edk discovered that Dnsmasq incorrectly handled certain\ninput in the dhcp_release utility. A local attacker could possibly\nuse this issue to cause Dnsmasq to crash, resulting in a denial of\nservice.",
  "id": "USN-8311-1",
  "modified": "2026-05-26T19:11:20Z",
  "published": "2026-05-26T19:11:20Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://ubuntu.com/security/notices/USN-8311-1"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2020-37127"
    }
  ],
  "related": [],
  "schema_version": "1.7.0",
  "summary": "dnsmasq vulnerability",
  "upstream": [
    "UBUNTU-CVE-2020-37127"
  ]
}

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.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

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.

Action not permitted

UBUNTU-CVE-2020-37127 (CVE-2020-37127)

CVE-2020-37127 (GCVE-0-2020-37127)

USN-8311-1 (UBUNTU-CVE-2020-37127)

Tags

Sightings

Nomenclature

Related by attack behaviour