Asterisk: ARI setChannelVar bypasses live_dangerously and permits FILE() writes

{
  "id": "26cc86ffb34dc32203d3c57753179d657c5cdde7b4dbb307ee85311a63015c95",
  "url": "https://www.cve.org/CVERecord?id=CVE-2026-57202",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "Asterisk: ARI setChannelVar bypasses live_dangerously and permits FILE() writes",
    "summary": "Asterisk is an open source private branch exchange and telephony toolkit. Prior to Asterisk 20.20.1, 21.12.3, 22.10.1, 23.4.1 and Certified Asterisk 20.7-cert11, 22.8-cert3, an authenticated Asterisk REST Interface (ARI) attacker with read-only privileges may use `setChannelVar` to execute write dialplan functions, including `FILE()` writes, even when `live_dangerously` in `asterisk.conf` is set to no. The Asterisk HTTP web server must be enabled and reachable, and the attacker must already have valid `read-only ARI credentials`. HTTP is disabled by default and binds only to 127.0.0.1 by default even when enabled. This issue is fixed in Asterisk 20.20.1, 21.12.3, 22.10.1, 23.4.1 and Certified Asterisk 20.7-cert11, 22.8-cert3.",
    "evidence": "cve:CVE-2026-57202",
    "products": [
      {
        "name": {
          "value": "asterisk",
          "evidence": "/containers/cna/affected/0/product"
        },
        "prerequisites": [],
        "fixed_versions": [],
        "affected_versions": []
      },
      {
        "name": {
          "value": "certified-asterisk",
          "evidence": "/containers/cna/affected/1/product"
        },
        "prerequisites": [],
        "fixed_versions": [],
        "affected_versions": []
      }
    ],
    "severity": "high",
    "structured": {
      "id": "CVE-2026-57202",
      "aliases": [
        "CVE-2026-57202"
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "scope": "UNCHANGED",
            "version": "3.1",
            "baseScore": 8.1,
            "attackVector": "NETWORK",
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N",
            "integrityImpact": "HIGH",
            "userInteraction": "NONE",
            "attackComplexity": "LOW",
            "availabilityImpact": "NONE",
            "privilegesRequired": "LOW",
            "confidentialityImpact": "HIGH"
          }
        }
      ],
      "affected": [
        {
          "vendor": "asterisk",
          "product": "asterisk",
          "versions": [
            {
              "status": "affected",
              "version": "< 20.20.1"
            },
            {
              "status": "affected",
              "version": ">= 21.0.0-pre1, < 21.12.3"
            },
            {
              "status": "affected",
              "version": ">= 22.0.0-pre1, < 22.10.1"
            },
            {
              "status": "affected",
              "version": ">= 23.0.0-pre1, < 23.4.1"
            }
          ]
        },
        {
          "vendor": "asterisk",
          "product": "certified-asterisk",
          "versions": [
            {
              "status": "affected",
              "version": "< 20.7-cert11"
            },
            {
              "status": "affected",
              "version": ">= 22.8-cert1-pre1, < 22.8-cert3"
            }
          ]
        }
      ],
      "modified": "2026-10-28T16:13:52.414Z",
      "provider": "cve",
      "references": [
        "https://github.com/asterisk/asterisk/security/advisories/GHSA-vrfp-mg3q-3959",
        "https://github.com/asterisk/asterisk/commit/8f8ccaf70a80e518147b0c35c0c252de4735446f",
        "https://github.com/asterisk/asterisk/commit/92a5dd1003b737ae1cd2df4e60b73beb8d5e42bb",
        "https://github.com/asterisk/asterisk/commit/ba04e7f1f98887c3c6e0dc4ddce663021f7e948a",
        "https://github.com/asterisk/asterisk/commit/bf9354267557ef6d6b75f5304faa243f595a5a66",
        "https://github.com/asterisk/asterisk/commit/caa4d50d9c3bf04fc979b5b2cdc5dc425772d845",
        "https://github.com/asterisk/asterisk/commit/d47b0b6e5a384746db194f751b53d559aba8dba9",
        "https://github.com/asterisk/asterisk/commit/d8614505b27688dec3a1d14554f52fda94712928",
        "https://github.com/asterisk/asterisk/releases/tag/20.20.1",
        "https://github.com/asterisk/asterisk/releases/tag/21.12.3",
        "https://github.com/asterisk/asterisk/releases/tag/22.10.1",
        "https://github.com/asterisk/asterisk/releases/tag/23.4.1",
        "https://github.com/asterisk/asterisk/releases/tag/certified-20.7-cert11",
        "https://github.com/asterisk/asterisk/releases/tag/certified-22.8-cert3",
        "https://github.com/asterisk/asterisk/tree/24.0.0-pre1"
      ],
      "provider_metadata": {
        "adp": [
          {
            "title": "CISA ADP Vulnrichment",
            "metrics": [
              {
                "other": {
                  "type": "ssvc",
                  "content": {
                    "id": "CVE-2026-57202",
                    "role": "CISA Coordinator",
                    "options": [
                      {
                        "Exploitation": "none"
                      },
                      {
                        "Automatable": "no"
                      },
                      {
                        "Technical Impact": "total"
                      }
                    ],
                    "version": "2.0.3",
                    "timestamp": "2026-10-28T14:58:17.687111Z"
                  }
                }
              }
            ],
            "providerMetadata": {
              "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
              "shortName": "CISA-ADP",
              "dateUpdated": "2026-10-28T16:13:52.414Z"
            }
          }
        ],
        "cna": {
          "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
          "shortName": "GitHub_M",
          "dateUpdated": "2026-10-27T17:58:46.257Z"
        }
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-57202",
        "evidence": "/cveMetadata/cveId"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/containers/cna/metrics"
  },
  "source_id": "core-cve",
  "document_id": 460239,
  "published_at": "2026-10-27T17:58:46.257+00:00"
}