{
    "dataType": "CVE_RECORD",
    "dataVersion": "5.2",
    "cveMetadata": {
        "state": "PUBLISHED",
        "cveId": "CVE-2021-37706",
        "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "assignerShortName": "GitHub_M",
        "dateUpdated": "2025-11-04T16:09:17.025Z",
        "dateReserved": "2021-07-29T00:00:00.000Z",
        "datePublished": "2021-12-22T00:00:00.000Z"
    },
    "containers": {
        "cna": {
            "title": "Potential integer underflow upon receiving STUN message in PJSIP",
            "providerMetadata": {
                "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
                "shortName": "GitHub_M",
                "dateUpdated": "2023-08-30T00:06:40.686Z"
            },
            "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’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."
                }
            ],
            "affected": [
                {
                    "vendor": "pjsip",
                    "product": "pjproject",
                    "versions": [
                        {
                            "version": "<= 2.11.1",
                            "status": "affected"
                        }
                    ]
                }
            ],
            "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"
                }
            ],
            "metrics": [
                {
                    "cvssV3_1": {
                        "version": "3.1",
                        "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L",
                        "attackVector": "NETWORK",
                        "attackComplexity": "LOW",
                        "privilegesRequired": "NONE",
                        "userInteraction": "NONE",
                        "scope": "UNCHANGED",
                        "confidentialityImpact": "LOW",
                        "integrityImpact": "LOW",
                        "availabilityImpact": "LOW",
                        "baseScore": 7.3,
                        "baseSeverity": "HIGH"
                    }
                }
            ],
            "problemTypes": [
                {
                    "descriptions": [
                        {
                            "type": "CWE",
                            "lang": "en",
                            "description": "CWE-191: Integer Underflow (Wrap or Wraparound)",
                            "cweId": "CWE-191"
                        }
                    ]
                }
            ],
            "source": {
                "advisory": "GHSA-2qpg-f6wf-w984",
                "discovery": "UNKNOWN"
            }
        },
        "adp": [
            {
                "title": "CVE Program Container",
                "references": [
                    {
                        "url": "https://github.com/pjsip/pjproject/security/advisories/GHSA-2qpg-f6wf-w984",
                        "tags": [
                            "x_transferred"
                        ]
                    },
                    {
                        "url": "https://github.com/pjsip/pjproject/commit/15663e3f37091069b8c98a7fce680dc04bc8e865",
                        "tags": [
                            "x_transferred"
                        ]
                    },
                    {
                        "name": "20220304 AST-2022-004: pjproject: integer underflow on STUN message",
                        "tags": [
                            "mailing-list",
                            "x_transferred"
                        ],
                        "url": "http://seclists.org/fulldisclosure/2022/Mar/0"
                    },
                    {
                        "url": "http://packetstormsecurity.com/files/166225/Asterisk-Project-Security-Advisory-AST-2022-004.html",
                        "tags": [
                            "x_transferred"
                        ]
                    },
                    {
                        "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"
                    }
                ],
                "providerMetadata": {
                    "orgId": "af854a3a-2127-422b-91ae-364da2661108",
                    "shortName": "CVE",
                    "dateUpdated": "2025-11-04T16:09:17.025Z"
                }
            }
        ]
    }
}