Security advisory

{
  "id": "033cf6ca10547acdaddba0ae5bced63990e93ec780dca7a8be0086e187a00e14",
  "url": "https://osv.dev/vulnerability/CVE-2021-43804",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "CVE-2021-43804",
    "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 RTCP BYE message contains a reason's length, this declared length is not checked against the actual received packet size, potentially resulting in an out-of-bound read access. This issue affects all users that use PJMEDIA and RTCP. A malicious actor can send a RTCP BYE message with an invalid reason length. Users are advised to upgrade as soon as possible. There are no known workarounds.",
    "evidence": "osv:CVE-2021-43804",
    "products": [],
    "severity": "high",
    "structured": {
      "id": "CVE-2021-43804",
      "aliases": [
        "CVE-2021-43804",
        "GHSA-3qx3-cg72-wrh9"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/pjsip/pjproject",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "last_affected": "513700f74787009241a11eda125284277f7dfc1c"
                },
                {
                  "fixed": "8b621f192cae14456ee0b0ade52ce6c6f258af1e"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:teluu:pjsip:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "last_affected": "2.11.1"
                      }
                    ],
                    "source": "CPE_RANGE"
                  },
                  {
                    "range": [
                      {
                        "fixed": "8b621f192cae14456ee0b0ade52ce6c6f258af1e"
                      }
                    ],
                    "source": "REFERENCES_COMMIT"
                  }
                ]
              }
            }
          ],
          "versions": [
            "2.11.1",
            "2.11",
            "2.10"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2021-43804.json",
            "vanir_signatures": [
              {
                "id": "CVE-2021-43804-21f02fcb",
                "digest": {
                  "threshold": 0.9,
                  "line_hashes": [
                    "103894779853426178814937399479854292327",
                    "130803791047819453649259362093641933649",
                    "122525548633403368601872048441338313566",
                    "129850034086129389672742617489432174938",
                    "106737951759900644022218887804782806478",
                    "169713399488750805111827828987683376328"
                  ]
                },
                "source": "https://github.com/pjsip/pjproject/commit/8b621f192cae14456ee0b0ade52ce6c6f258af1e",
                "target": {
                  "file": "pjmedia/src/pjmedia/rtcp.c"
                },
                "deprecated": false,
                "signature_type": "Line",
                "signature_version": "v1"
              },
              {
                "id": "CVE-2021-43804-252f8bbe",
                "digest": {
                  "length": 456,
                  "function_hash": "276740140683552634685635405292978235453"
                },
                "source": "https://github.com/pjsip/pjproject/commit/8b621f192cae14456ee0b0ade52ce6c6f258af1e",
                "target": {
                  "file": "pjmedia/src/pjmedia/rtcp.c",
                  "function": "parse_rtcp_bye"
                },
                "deprecated": false,
                "signature_type": "Function",
                "signature_version": "v1"
              }
            ],
            "vanir_signatures_modified": "2026-10-20T14:32:27Z"
          }
        }
      ],
      "modified": "2026-10-20T14:32:27.745097163Z",
      "provider": "osv",
      "references": [
        "https://lists.debian.org/debian-lts-announce/2023/08/msg00038.html",
        "https://lists.debian.org/debian-lts-announce/2024/09/msg00030.html",
        "https://lists.debian.org/debian-lts-announce/2022/03/msg00035.html",
        "https://lists.debian.org/debian-lts-announce/2022/11/msg00021.html",
        "https://security.gentoo.org/glsa/202210-37",
        "https://www.debian.org/security/2022/dsa-5285",
        "https://github.com/pjsip/pjproject/commit/8b621f192cae14456ee0b0ade52ce6c6f258af1e",
        "https://github.com/pjsip/pjproject/security/advisories/GHSA-3qx3-cg72-wrh9"
      ],
      "provider_metadata": {
        "unresolved_ranges": [
          {
            "cpes": [
              "cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:*",
              "cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*"
            ],
            "vendor_product": "debian:debian_linux",
            "extracted_events": [
              {
                "range": [
                  {
                    "introduced": "9.0"
                  },
                  {
                    "last_affected": "9.0"
                  },
                  {
                    "introduced": "10.0"
                  },
                  {
                    "last_affected": "10.0"
                  }
                ],
                "source": "CPE_STRING"
              }
            ]
          }
        ]
      }
    },
    "related_cves": [
      {
        "value": "CVE-2021-43804",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 389706,
  "published_at": "2021-12-22T18:15:07.9+00:00"
}