CVE-2021-37706 (GCVE-0-2021-37706)

Vulnerability from cvelistv5 – Published: 2021-12-22 00:00 – Updated: 2025-11-04 16:09
VLAI?
Title
Potential integer underflow upon receiving STUN message in PJSIP
Summary
PJSIP is a free and open source multimedia communication library written in C language implementing standard based protocols such as SIP, SDP, RTP, STUN, TURN, and ICE. In affected versions if the incoming STUN message contains an ERROR-CODE attribute, the header length is not checked before performing a subtraction operation, potentially resulting in an integer underflow scenario. This issue affects all users that use STUN. A malicious actor located within the victim’s network may forge and send a specially crafted UDP (STUN) message that could remotely execute arbitrary code on the victim’s machine. Users are advised to upgrade as soon as possible. There are no known workarounds.
Severity ?
7.3 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L
CWE
  • CWE-191 - Integer Underflow (Wrap or Wraparound)
Assigner
References
Impacted products
Vendor Product Version
pjsip pjproject Affected: <= 2.11.1
Create a notification for this product.
Show details on NVD website
To clipboard 

{
  "containers": {
    "adp": [
      {
        "providerMetadata": {
          "dateUpdated": "2025-11-04T16:09:17.025Z",
          "orgId": "af854a3a-2127-422b-91ae-364da2661108",
          "shortName": "CVE"
        },
        "references": [
          {
            "tags": [
              "x_transferred"
            ],
            "url": "https://github.com/pjsip/pjproject/security/advisories/GHSA-2qpg-f6wf-w984"
          },
          {
            "tags": [
              "x_transferred"
            ],
            "url": "https://github.com/pjsip/pjproject/commit/15663e3f37091069b8c98a7fce680dc04bc8e865"
          },
          {
            "name": "20220304 AST-2022-004: pjproject: integer underflow on STUN message",
            "tags": [
              "mailing-list",
              "x_transferred"
            ],
            "url": "http://seclists.org/fulldisclosure/2022/Mar/0"
          },
          {
            "tags": [
              "x_transferred"
            ],
            "url": "http://packetstormsecurity.com/files/166225/Asterisk-Project-Security-Advisory-AST-2022-004.html"
          },
          {
            "name": "[debian-lts-announce] 20220328 [SECURITY] [DLA 2962-1] pjproject security update",
            "tags": [
              "mailing-list",
              "x_transferred"
            ],
            "url": "https://lists.debian.org/debian-lts-announce/2022/03/msg00035.html"
          },
          {
            "name": "GLSA-202210-37",
            "tags": [
              "vendor-advisory",
              "x_transferred"
            ],
            "url": "https://security.gentoo.org/glsa/202210-37"
          },
          {
            "name": "[debian-lts-announce] 20221117 [SECURITY] [DLA 3194-1] asterisk security update",
            "tags": [
              "mailing-list",
              "x_transferred"
            ],
            "url": "https://lists.debian.org/debian-lts-announce/2022/11/msg00021.html"
          },
          {
            "name": "DSA-5285",
            "tags": [
              "vendor-advisory",
              "x_transferred"
            ],
            "url": "https://www.debian.org/security/2022/dsa-5285"
          },
          {
            "name": "[debian-lts-announce] 20230829 [SECURITY] [DLA 3549-1] ring security update",
            "tags": [
              "mailing-list",
              "x_transferred"
            ],
            "url": "https://lists.debian.org/debian-lts-announce/2023/08/msg00038.html"
          },
          {
            "url": "https://lists.debian.org/debian-lts-announce/2024/09/msg00030.html"
          }
        ],
        "title": "CVE Program Container"
      }
    ],
    "cna": {
      "affected": [
        {
          "product": "pjproject",
          "vendor": "pjsip",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c= 2.11.1"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "PJSIP is a free and open source multimedia communication library written in C language implementing standard based protocols such as SIP, SDP, RTP, STUN, TURN, and ICE. In affected versions if the incoming STUN message contains an ERROR-CODE attribute, the header length is not checked before performing a subtraction operation, potentially resulting in an integer underflow scenario. This issue affects all users that use STUN. A malicious actor located within the victim\u2019s network may forge and send a specially crafted UDP (STUN) message that could remotely execute arbitrary code on the victim\u2019s machine. Users are advised to upgrade as soon as possible. There are no known workarounds."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "LOW",
            "baseScore": 7.3,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "LOW",
            "integrityImpact": "LOW",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L",
            "version": "3.1"
          }
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-191",
              "description": "CWE-191: Integer Underflow (Wrap or Wraparound)",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2023-08-30T00:06:40.686Z",
        "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "shortName": "GitHub_M"
      },
      "references": [
        {
          "url": "https://github.com/pjsip/pjproject/security/advisories/GHSA-2qpg-f6wf-w984"
        },
        {
          "url": "https://github.com/pjsip/pjproject/commit/15663e3f37091069b8c98a7fce680dc04bc8e865"
        },
        {
          "name": "20220304 AST-2022-004: pjproject: integer underflow on STUN message",
          "tags": [
            "mailing-list"
          ],
          "url": "http://seclists.org/fulldisclosure/2022/Mar/0"
        },
        {
          "url": "http://packetstormsecurity.com/files/166225/Asterisk-Project-Security-Advisory-AST-2022-004.html"
        },
        {
          "name": "[debian-lts-announce] 20220328 [SECURITY] [DLA 2962-1] pjproject security update",
          "tags": [
            "mailing-list"
          ],
          "url": "https://lists.debian.org/debian-lts-announce/2022/03/msg00035.html"
        },
        {
          "name": "GLSA-202210-37",
          "tags": [
            "vendor-advisory"
          ],
          "url": "https://security.gentoo.org/glsa/202210-37"
        },
        {
          "name": "[debian-lts-announce] 20221117 [SECURITY] [DLA 3194-1] asterisk security update",
          "tags": [
            "mailing-list"
          ],
          "url": "https://lists.debian.org/debian-lts-announce/2022/11/msg00021.html"
        },
        {
          "name": "DSA-5285",
          "tags": [
            "vendor-advisory"
          ],
          "url": "https://www.debian.org/security/2022/dsa-5285"
        },
        {
          "name": "[debian-lts-announce] 20230829 [SECURITY] [DLA 3549-1] ring security update",
          "tags": [
            "mailing-list"
          ],
          "url": "https://lists.debian.org/debian-lts-announce/2023/08/msg00038.html"
        }
      ],
      "source": {
        "advisory": "GHSA-2qpg-f6wf-w984",
        "discovery": "UNKNOWN"
      },
      "title": "Potential integer underflow upon receiving STUN message in PJSIP"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
    "assignerShortName": "GitHub_M",
    "cveId": "CVE-2021-37706",
    "datePublished": "2021-12-22T00:00:00.000Z",
    "dateReserved": "2021-07-29T00:00:00.000Z",
    "dateUpdated": "2025-11-04T16:09:17.025Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "nvd": "{\"cve\":{\"id\":\"CVE-2021-37706\",\"sourceIdentifier\":\"security-advisories@github.com\",\"published\":\"2021-12-22T18:15:07.487\",\"lastModified\":\"2025-11-04T16:15:43.010\",\"vulnStatus\":\"Modified\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"PJSIP is a free and open source multimedia communication library written in C language implementing standard based protocols such as SIP, SDP, RTP, STUN, TURN, and ICE. In affected versions if the incoming STUN message contains an ERROR-CODE attribute, the header length is not checked before performing a subtraction operation, potentially resulting in an integer underflow scenario. This issue affects all users that use STUN. A malicious actor located within the victim\u2019s network may forge and send a specially crafted UDP (STUN) message that could remotely execute arbitrary code on the victim\u2019s machine. Users are advised to upgrade as soon as possible. There are no known workarounds.\"},{\"lang\":\"es\",\"value\":\"PJSIP es una biblioteca de comunicaci\u00f3n multimedia gratuita y de c\u00f3digo abierto escrita en lenguaje C que implementa protocolos basados en est\u00e1ndares como SIP, SDP, RTP, STUN, TURN e ICE. En las versiones afectadas, si el mensaje STUN entrante contiene un atributo ERROR-CODE, no se comprueba la longitud del encabezado antes de llevar a cabo una operaci\u00f3n de sustracci\u00f3n, resultando en un escenario de desbordamiento de enteros. Este problema afecta a todos los usuarios que usan STUN. Un actor malicioso situado en la red de la v\u00edctima puede falsificar y enviar un mensaje UDP (STUN) especialmente dise\u00f1ado que podr\u00eda ejecutar remotamente c\u00f3digo arbitrario en la m\u00e1quina de la v\u00edctima. Se aconseja a usuarios que actualicen lo antes posible. No se presentan soluciones conocidas\"}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"security-advisories@github.com\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L\",\"baseScore\":7.3,\"baseSeverity\":\"HIGH\",\"attackVector\":\"NETWORK\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"NONE\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"LOW\",\"integrityImpact\":\"LOW\",\"availabilityImpact\":\"LOW\"},\"exploitabilityScore\":3.9,\"impactScore\":3.4},{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H\",\"baseScore\":9.8,\"baseSeverity\":\"CRITICAL\",\"attackVector\":\"NETWORK\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"NONE\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"HIGH\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":3.9,\"impactScore\":5.9}],\"cvssMetricV2\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"cvssData\":{\"version\":\"2.0\",\"vectorString\":\"AV:N/AC:M/Au:N/C:C/I:C/A:C\",\"baseScore\":9.3,\"accessVector\":\"NETWORK\",\"accessComplexity\":\"MEDIUM\",\"authentication\":\"NONE\",\"confidentialityImpact\":\"COMPLETE\",\"integrityImpact\":\"COMPLETE\",\"availabilityImpact\":\"COMPLETE\"},\"baseSeverity\":\"HIGH\",\"exploitabilityScore\":8.6,\"impactScore\":10.0,\"acInsufInfo\":false,\"obtainAllPrivilege\":false,\"obtainUserPrivilege\":false,\"obtainOtherPrivilege\":false,\"userInteractionRequired\":false}]},\"weaknesses\":[{\"source\":\"security-advisories@github.com\",\"type\":\"Secondary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-191\"}]},{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-191\"}]}],\"configurations\":[{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:teluu:pjsip:*:*:*:*:*:*:*:*\",\"versionEndIncluding\":\"2.11.1\",\"matchCriteriaId\":\"6BB0273A-3235-4BC7-A1BE-7D35BABD8617\"}]}]},{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:asterisk:certified_asterisk:*:*:*:*:*:*:*:*\",\"versionEndExcluding\":\"16.8.0\",\"matchCriteriaId\":\"02200524-98C1-49E2-8DFE-7BE82E1181E2\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:asterisk:certified_asterisk:16.8.0:*:*:*:*:*:*:*\",\"matchCriteriaId\":\"FC49FD2F-9A64-4F92-9B73-50E37BEB207E\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:asterisk:certified_asterisk:16.8.0:cert1:*:*:*:*:*:*\",\"matchCriteriaId\":\"E64BCD44-2298-4710-9CC3-DF82E6A8DF94\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:asterisk:certified_asterisk:16.8.0:cert10:*:*:*:*:*:*\",\"matchCriteriaId\":\"91CCAB0C-C0F8-4619-AAE1-F6F13FF31570\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:asterisk:certified_asterisk:16.8.0:cert11:*:*:*:*:*:*\",\"matchCriteriaId\":\"F2B7CBB3-E037-416B-AD16-9A553D6A4775\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:asterisk:certified_asterisk:16.8.0:cert12:*:*:*:*:*:*\",\"matchCriteriaId\":\"DE7DDFE1-6A06-477A-AB45-D00053CFA7EC\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:asterisk:certified_asterisk:16.8.0:cert2:*:*:*:*:*:*\",\"matchCriteriaId\":\"A35C117A-6EFB-42EB-AD2A-EA7866606927\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:asterisk:certified_asterisk:16.8.0:cert3:*:*:*:*:*:*\",\"matchCriteriaId\":\"40003CBE-792F-4875-9E60-6F1CE0BBAA8E\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:asterisk:certified_asterisk:16.8.0:cert4:*:*:*:*:*:*\",\"matchCriteriaId\":\"46A7AA7B-13F2-496A-99ED-1CC13234E8CB\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:asterisk:certified_asterisk:16.8.0:cert5:*:*:*:*:*:*\",\"matchCriteriaId\":\"147663CB-B48D-4D89-96BF-F92FF96F347F\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:asterisk:certified_asterisk:16.8.0:cert6:*:*:*:*:*:*\",\"matchCriteriaId\":\"27DBBC83-930A-4ECE-8C1E-47481D881B0D\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:asterisk:certified_asterisk:16.8.0:cert7:*:*:*:*:*:*\",\"matchCriteriaId\":\"B987A13D-A363-4DCE-BBA1-E35E81ACBA60\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:asterisk:certified_asterisk:16.8.0:cert8:*:*:*:*:*:*\",\"matchCriteriaId\":\"01A5B7F9-FAD2-4C0C-937D-CF1086512130\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:asterisk:certified_asterisk:16.8.0:cert9:*:*:*:*:*:*\",\"matchCriteriaId\":\"F60B4271-F987-4932-86EE-45ED099661E1\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:sangoma:asterisk:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"16.0.0\",\"versionEndExcluding\":\"16.24.1\",\"matchCriteriaId\":\"DE99C3B4-20EC-4AC8-9A0A-C690E2DBED99\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:sangoma:asterisk:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"18.0.0\",\"versionEndExcluding\":\"18.10.1\",\"matchCriteriaId\":\"C109B569-DE0D-4AE4-A128-239077CCC05F\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:sangoma:asterisk:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"19.0.0\",\"versionEndExcluding\":\"19.2.1\",\"matchCriteriaId\":\"44E4E3A7-8CB3-491C-98F6-F78345533E3B\"}]}]},{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*\",\"matchCriteriaId\":\"DEECE5FC-CACF-4496-A3E7-164736409252\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:*\",\"matchCriteriaId\":\"07B237A9-69A3-4A9C-9DA0-4E06BD37AE73\"}]}]}],\"references\":[{\"url\":\"http://packetstormsecurity.com/files/166225/Asterisk-Project-Security-Advisory-AST-2022-004.html\",\"source\":\"security-advisories@github.com\",\"tags\":[\"Third Party Advisory\",\"VDB Entry\"]},{\"url\":\"http://seclists.org/fulldisclosure/2022/Mar/0\",\"source\":\"security-advisories@github.com\",\"tags\":[\"Mailing List\",\"Patch\",\"Third Party Advisory\"]},{\"url\":\"https://github.com/pjsip/pjproject/commit/15663e3f37091069b8c98a7fce680dc04bc8e865\",\"source\":\"security-advisories@github.com\",\"tags\":[\"Patch\",\"Third Party Advisory\"]},{\"url\":\"https://github.com/pjsip/pjproject/security/advisories/GHSA-2qpg-f6wf-w984\",\"source\":\"security-advisories@github.com\",\"tags\":[\"Patch\",\"Third Party Advisory\"]},{\"url\":\"https://lists.debian.org/debian-lts-announce/2022/03/msg00035.html\",\"source\":\"security-advisories@github.com\",\"tags\":[\"Mailing List\",\"Third Party Advisory\"]},{\"url\":\"https://lists.debian.org/debian-lts-announce/2022/11/msg00021.html\",\"source\":\"security-advisories@github.com\",\"tags\":[\"Mailing List\",\"Third Party Advisory\"]},{\"url\":\"https://lists.debian.org/debian-lts-announce/2023/08/msg00038.html\",\"source\":\"security-advisories@github.com\"},{\"url\":\"https://security.gentoo.org/glsa/202210-37\",\"source\":\"security-advisories@github.com\",\"tags\":[\"Third Party Advisory\"]},{\"url\":\"https://www.debian.org/security/2022/dsa-5285\",\"source\":\"security-advisories@github.com\",\"tags\":[\"Third Party Advisory\"]},{\"url\":\"http://packetstormsecurity.com/files/166225/Asterisk-Project-Security-Advisory-AST-2022-004.html\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Third Party Advisory\",\"VDB Entry\"]},{\"url\":\"http://seclists.org/fulldisclosure/2022/Mar/0\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Mailing List\",\"Patch\",\"Third Party Advisory\"]},{\"url\":\"https://github.com/pjsip/pjproject/commit/15663e3f37091069b8c98a7fce680dc04bc8e865\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Patch\",\"Third Party Advisory\"]},{\"url\":\"https://github.com/pjsip/pjproject/security/advisories/GHSA-2qpg-f6wf-w984\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Patch\",\"Third Party Advisory\"]},{\"url\":\"https://lists.debian.org/debian-lts-announce/2022/03/msg00035.html\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Mailing List\",\"Third Party Advisory\"]},{\"url\":\"https://lists.debian.org/debian-lts-announce/2022/11/msg00021.html\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Mailing List\",\"Third Party Advisory\"]},{\"url\":\"https://lists.debian.org/debian-lts-announce/2023/08/msg00038.html\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\"},{\"url\":\"https://lists.debian.org/debian-lts-announce/2024/09/msg00030.html\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\"},{\"url\":\"https://security.gentoo.org/glsa/202210-37\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Third Party Advisory\"]},{\"url\":\"https://www.debian.org/security/2022/dsa-5285\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Third Party Advisory\"]}]}}"
  }
}


Log in or create an account to share your comment.




Tags
Taxonomy of the tags.




Sightings

Author Source Type Date

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.