FKIE_CVE-2021-37706

Vulnerability from fkie_nvd - Published: 2021-12-22 18:15 - Updated: 2025-11-04 16:15
Severity ?
7.3 (High) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L
9.8 (Critical) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
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.
References
security-advisories@github.comhttp://packetstormsecurity.com/files/166225/Asterisk-Project-Security-Advisory-AST-2022-004.htmlThird Party Advisory, VDB Entry
security-advisories@github.comhttp://seclists.org/fulldisclosure/2022/Mar/0Mailing List, Patch, Third Party Advisory
security-advisories@github.comhttps://github.com/pjsip/pjproject/commit/15663e3f37091069b8c98a7fce680dc04bc8e865Patch, Third Party Advisory
security-advisories@github.comhttps://github.com/pjsip/pjproject/security/advisories/GHSA-2qpg-f6wf-w984Patch, Third Party Advisory
security-advisories@github.comhttps://lists.debian.org/debian-lts-announce/2022/03/msg00035.htmlMailing List, Third Party Advisory
security-advisories@github.comhttps://lists.debian.org/debian-lts-announce/2022/11/msg00021.htmlMailing List, Third Party Advisory
security-advisories@github.comhttps://lists.debian.org/debian-lts-announce/2023/08/msg00038.html
security-advisories@github.comhttps://security.gentoo.org/glsa/202210-37Third Party Advisory
security-advisories@github.comhttps://www.debian.org/security/2022/dsa-5285Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108http://packetstormsecurity.com/files/166225/Asterisk-Project-Security-Advisory-AST-2022-004.htmlThird Party Advisory, VDB Entry
af854a3a-2127-422b-91ae-364da2661108http://seclists.org/fulldisclosure/2022/Mar/0Mailing List, Patch, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://github.com/pjsip/pjproject/commit/15663e3f37091069b8c98a7fce680dc04bc8e865Patch, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://github.com/pjsip/pjproject/security/advisories/GHSA-2qpg-f6wf-w984Patch, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://lists.debian.org/debian-lts-announce/2022/03/msg00035.htmlMailing List, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://lists.debian.org/debian-lts-announce/2022/11/msg00021.htmlMailing List, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://lists.debian.org/debian-lts-announce/2023/08/msg00038.html
af854a3a-2127-422b-91ae-364da2661108https://lists.debian.org/debian-lts-announce/2024/09/msg00030.html
af854a3a-2127-422b-91ae-364da2661108https://security.gentoo.org/glsa/202210-37Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://www.debian.org/security/2022/dsa-5285Third Party Advisory
Impacted products
Vendor Product Version
teluu pjsip *
asterisk certified_asterisk *
asterisk certified_asterisk 16.8.0
asterisk certified_asterisk 16.8.0
asterisk certified_asterisk 16.8.0
asterisk certified_asterisk 16.8.0
asterisk certified_asterisk 16.8.0
asterisk certified_asterisk 16.8.0
asterisk certified_asterisk 16.8.0
asterisk certified_asterisk 16.8.0
asterisk certified_asterisk 16.8.0
asterisk certified_asterisk 16.8.0
asterisk certified_asterisk 16.8.0
asterisk certified_asterisk 16.8.0
asterisk certified_asterisk 16.8.0
sangoma asterisk *
sangoma asterisk *
sangoma asterisk *
debian debian_linux 9.0
debian debian_linux 10.0
To clipboard 

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  "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"
    }
  ],
  "id": "CVE-2021-37706",
  "lastModified": "2025-11-04T16:15:43.010",
  "metrics": {
    "cvssMetricV2": [
      {
        "acInsufInfo": false,
        "baseSeverity": "HIGH",
        "cvssData": {
          "accessComplexity": "MEDIUM",
          "accessVector": "NETWORK",
          "authentication": "NONE",
          "availabilityImpact": "COMPLETE",
          "baseScore": 9.3,
          "confidentialityImpact": "COMPLETE",
          "integrityImpact": "COMPLETE",
          "vectorString": "AV:N/AC:M/Au:N/C:C/I:C/A:C",
          "version": "2.0"
        },
        "exploitabilityScore": 8.6,
        "impactScore": 10.0,
        "obtainAllPrivilege": false,
        "obtainOtherPrivilege": false,
        "obtainUserPrivilege": false,
        "source": "nvd@nist.gov",
        "type": "Primary",
        "userInteractionRequired": false
      }
    ],
    "cvssMetricV31": [
      {
        "cvssData": {
          "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"
        },
        "exploitabilityScore": 3.9,
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        "source": "security-advisories@github.com",
        "type": "Secondary"
      },
      {
        "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"
      }
    ]
  },
  "published": "2021-12-22T18:15:07.487",
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  "sourceIdentifier": "security-advisories@github.com",
  "vulnStatus": "Modified",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-191"
        }
      ],
      "source": "security-advisories@github.com",
      "type": "Secondary"
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    {
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      "source": "nvd@nist.gov",
      "type": "Primary"
    }
  ]
}


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Sightings

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  • 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.
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