Security advisory

{
  "id": "89428942c4d407f3417416f55edaf7043467c61c356c1b1bba90bbd24bef2e85",
  "url": "https://osv.dev/vulnerability/CVE-2020-27507",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "CVE-2020-27507",
    "summary": "The Kamailio SIP before 5.5.0 server mishandles INVITE requests with duplicated fields and overlength tag, leading to a buffer overflow that crashes the server or possibly have unspecified other impact.",
    "evidence": "osv:CVE-2020-27507",
    "products": [],
    "severity": "critical",
    "structured": {
      "id": "CVE-2020-27507",
      "aliases": [
        "CVE-2020-27507"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/kamailio/kamailio",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "d4c1a11aefb0192c1cb829959ef3a70b84cd7cbd"
                },
                {
                  "fixed": "ada3701d22b1fd579f06b4f54fa695fa988e685f"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:kamailio:kamailio:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "fixed": "5.5.0"
                      }
                    ],
                    "source": "CPE_RANGE"
                  },
                  {
                    "range": [
                      {
                        "fixed": "ada3701d22b1fd579f06b4f54fa695fa988e685f"
                      }
                    ],
                    "source": "REFERENCES_COMMIT"
                  }
                ]
              }
            }
          ],
          "versions": [
            "sr_3.1_freeze",
            "3.0_pre1",
            "sr_before_modules_merge",
            "before_dest_info_changes_2",
            "before_tm_timers",
            "new_timers",
            "before_new_timers",
            "tmp_pcl_tag_17368Js8",
            "after_0_9_4_pkg_merge",
            "last_merge_to_janakj",
            "rel_0_9_0_root",
            "after_makefile_merges",
            "before_malloc_changes",
            "before_db_api_changes",
            "after_testing_0_8_12_r1_merge",
            "before_testing_0_8_12_r1_merge",
            "after_testing_0_8_12_r0_merge",
            "before_testing_0_8_12_r0_merge",
            "before_tcp_port_aliases",
            "before_socket_info_lists",
            "before_lumps_split",
            "testing_0_8_12_root",
            "v0_8_13dev-t16",
            "v0_8_12dev_t13",
            "v0_8_12dev_t05",
            "v0_8_12dev-t03",
            "v0_8_12_t02_merged_w_v0_8_11pre35",
            "v0_8_11dev34",
            "rel_0_8_11_root",
            "v0_8_11pre29-prerelease-cd",
            "v0_8_11pre29-prerelease",
            "v0_8_11pre29",
            "pre22",
            "bflmpsvz",
            "before_kill_repl_add_rm",
            "v0_8_11_pre9",
            "mem-fixes",
            "v0_8_11pre8",
            "old_mod_iface",
            "after_xl",
            "before_replication_patch",
            "before_xl",
            "pre6-tcp4",
            "pre6-tcp5-tm",
            "tcp2",
            "wo_sp",
            "post-zt",
            "pre-zt",
            "ser_0_8_10",
            "ser_0_8_10_pre5",
            "ser_0_8_10_pre4",
            "ser_0_8_10_pre2",
            "ser_0_8_10_pre3",
            "myself_port_lo",
            "new_hash",
            "ser_0_8_9-release",
            "ser_0_8_9",
            "ser_0_8_8-final-cd-release",
            "v0_8_8",
            "fixstats",
            "pre_fixstats",
            "gpled",
            "pregpl",
            "listen_ifs",
            "before_str2ip_changes",
            "budvar",
            "bigbang",
            "pre-bigbang",
            "srv",
            "ipv6",
            "ipv4_working",
            "ser_0_8_7-0-unstable",
            "ser_0_8_6-6-beer-release",
            "ser_0_8_6-5-stable",
            "ser_0-8-6-4",
            "bogdan_final_version",
            "ser_0839_errors",
            "ser_0_8_3_2",
            "ser_0_8_3_1",
            "sip_083",
            "ser_082",
            "ser_081-plugins",
            "sip_pre-plugin",
            "ser_0_7",
            "new_cfg_compiles",
            "sr_simpleconfig",
            "v03",
            "v0_2"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2020-27507.json",
            "vanir_signatures": [
              {
                "id": "CVE-2020-27507-0f70405b",
                "digest": {
                  "length": 5300,
                  "function_hash": "114316787224008964060248551968142233233"
                },
                "source": "https://github.com/kamailio/kamailio/commit/ada3701d22b1fd579f06b4f54fa695fa988e685f",
                "target": {
                  "file": "src/modules/tm/t_msgbuilder.c",
                  "function": "build_local_reparse"
                },
                "deprecated": false,
                "signature_type": "Function",
                "signature_version": "v1"
              },
              {
                "id": "CVE-2020-27507-5e3d2850",
                "digest": {
                  "threshold": 0.9,
                  "line_hashes": [
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                  ]
                },
                "source": "https://github.com/kamailio/kamailio/commit/ada3701d22b1fd579f06b4f54fa695fa988e685f",
                "target": {
                  "file": "src/modules/tm/t_msgbuilder.c"
                },
                "deprecated": false,
                "signature_type": "Line",
                "signature_version": "v1"
              }
            ],
            "vanir_signatures_modified": "2026-10-20T13:59:22Z"
          }
        }
      ],
      "modified": "2026-10-20T13:59:22.317052570Z",
      "provider": "osv",
      "references": [
        "https://lists.debian.org/debian-lts-announce/2023/05/msg00030.html",
        "https://github.com/kamailio/kamailio/issues/2503",
        "https://github.com/kamailio/kamailio/commit/ada3701d22b1fd579f06b4f54fa695fa988e685f"
      ],
      "provider_metadata": {}
    },
    "related_cves": [
      {
        "value": "CVE-2020-27507",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 388479,
  "published_at": "2023-03-15T20:15:10.283+00:00"
}