Security advisory

{
  "id": "053508ec7a0ae60936354104b0a81fe724213560e48f58d3235b1ec5b0f66084",
  "url": "https://osv.dev/vulnerability/CVE-2021-21375",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "CVE-2021-21375",
    "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 PJSIP version 2.10 and earlier, after an initial INVITE has been sent, when two 183 responses are received, with the first one causing negotiation failure, a crash will occur. This results in a denial of service.",
    "evidence": "osv:CVE-2021-21375",
    "products": [],
    "severity": "medium",
    "structured": {
      "id": "CVE-2021-21375",
      "aliases": [
        "CVE-2021-21375",
        "GHSA-hvq6-f89p-frvp"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/pjsip/pjproject",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "last_affected": "3e7b75cb2e482baee58c1991bd2fa4fb06774e0d"
                },
                {
                  "fixed": "97b3d7addbaa720b7ddb0af9bf6f3e443e664365"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:teluu:pjsip:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "last_affected": "2.10"
                      }
                    ],
                    "source": "CPE_RANGE"
                  },
                  {
                    "range": [
                      {
                        "fixed": "97b3d7addbaa720b7ddb0af9bf6f3e443e664365"
                      }
                    ],
                    "source": "REFERENCES_COMMIT"
                  }
                ]
              }
            }
          ],
          "versions": [
            "2.10"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2021-21375.json",
            "vanir_signatures": [
              {
                "id": "CVE-2021-21375-65f6b5a3",
                "digest": {
                  "length": 2273,
                  "function_hash": "13734569583431993630264975350009487979"
                },
                "source": "https://github.com/pjsip/pjproject/commit/97b3d7addbaa720b7ddb0af9bf6f3e443e664365",
                "target": {
                  "file": "pjmedia/src/pjmedia/sdp_neg.c",
                  "function": "pjmedia_sdp_neg_modify_local_offer2"
                },
                "deprecated": false,
                "signature_type": "Function",
                "signature_version": "v1"
              },
              {
                "id": "CVE-2021-21375-f857cca0",
                "digest": {
                  "threshold": 0.9,
                  "line_hashes": [
                    "248100845028017766450969646506005159060",
                    "189492453343772519506879860599826374548",
                    "262637420066588115023720394938227042301",
                    "310178250189378538141236777456768254801",
                    "60680263067466033629358969388750452071",
                    "179398261389345686416897928371642440363",
                    "79875539106273390755272412632527469941",
                    "208944703144237639310338683239024228937"
                  ]
                },
                "source": "https://github.com/pjsip/pjproject/commit/97b3d7addbaa720b7ddb0af9bf6f3e443e664365",
                "target": {
                  "file": "pjmedia/src/pjmedia/sdp_neg.c"
                },
                "deprecated": false,
                "signature_type": "Line",
                "signature_version": "v1"
              }
            ],
            "vanir_signatures_modified": "2026-10-20T14:18:42Z"
          }
        }
      ],
      "modified": "2026-10-20T14:18:42.338996414Z",
      "provider": "osv",
      "references": [
        "https://lists.debian.org/debian-lts-announce/2021/04/msg00023.html",
        "https://lists.debian.org/debian-lts-announce/2021/05/msg00020.html",
        "https://security.gentoo.org/glsa/202107-42",
        "https://github.com/pjsip/pjproject/commit/97b3d7addbaa720b7ddb0af9bf6f3e443e664365",
        "https://github.com/pjsip/pjproject/security/advisories/GHSA-hvq6-f89p-frvp"
      ],
      "provider_metadata": {
        "unresolved_ranges": [
          {
            "cpes": [
              "cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*"
            ],
            "vendor_product": "debian:debian_linux",
            "extracted_events": [
              {
                "range": [
                  {
                    "introduced": "9.0"
                  },
                  {
                    "last_affected": "9.0"
                  }
                ],
                "source": "CPE_STRING"
              }
            ]
          }
        ]
      }
    },
    "related_cves": [
      {
        "value": "CVE-2021-21375",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 388805,
  "published_at": "2021-03-10T23:15:12.52+00:00"
}