{"id":"CVE-2026-57194","title":"Asterisk: chan_unistim DIALPAGE digit handling can overflow phone_number and crash Asterisk","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 out-of-bounds write in `chan_unistim` `DIALPAGE` digit handl…","severity":"medium","cvss":5.9,"cvssVector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H","cvssSource":"cna","cwe":["CWE-787"],"vendor":"asterisk","product":"asterisk","affected":["asterisk < 20.20.1","asterisk >= 21.0.0-pre1, < 21.12.3","asterisk >= 22.0.0-pre1, < 22.10.1","asterisk >= 23.0.0-pre1, < 23.4.1","certified-asterisk < 20.7-cert11","certified-asterisk >= 22.8-cert1-pre1, < 22.8-cert3"],"published":"2026-10-27","updated":"2026-10-27","sourceUpdated":"2026-10-27T16:52:47.225Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-57194","references":[{"url":"https://github.com/asterisk/asterisk/security/advisories/GHSA-3g56-cgrh-95p5","label":"https://github.com/asterisk/asterisk/security/advisories/GHSA-3g56-cgrh-95p5"},{"url":"https://github.com/asterisk/asterisk/commit/430f423c84e4e32a462d907632b66c9793236e96","label":"https://github.com/asterisk/asterisk/commit/430f423c84e4e32a462d907632b66c9793236e96"},{"url":"https://github.com/asterisk/asterisk/commit/6da8e10c210d8e014c27c67235252e1dfc794446","label":"https://github.com/asterisk/asterisk/commit/6da8e10c210d8e014c27c67235252e1dfc794446"},{"url":"https://github.com/asterisk/asterisk/commit/6f414ec771eaa3318a4b2d28f70fa387196ae283","label":"https://github.com/asterisk/asterisk/commit/6f414ec771eaa3318a4b2d28f70fa387196ae283"},{"url":"https://github.com/asterisk/asterisk/commit/ce6e2233599b76bc30c33b4816b15609c8ddc8b6","label":"https://github.com/asterisk/asterisk/commit/ce6e2233599b76bc30c33b4816b15609c8ddc8b6"},{"url":"https://github.com/asterisk/asterisk/commit/d803b5370b05f39a6241b2556eb9894b02148e6a","label":"https://github.com/asterisk/asterisk/commit/d803b5370b05f39a6241b2556eb9894b02148e6a"},{"url":"https://github.com/asterisk/asterisk/commit/fc3a1cb3c386c962bfca8cd9d533d1390d4ad933","label":"https://github.com/asterisk/asterisk/commit/fc3a1cb3c386c962bfca8cd9d533d1390d4ad933"},{"url":"https://github.com/asterisk/asterisk/commit/ff65e4b0867bee12cdcb3a6219b976ee7ee08963","label":"https://github.com/asterisk/asterisk/commit/ff65e4b0867bee12cdcb3a6219b976ee7ee08963"},{"url":"https://github.com/asterisk/asterisk/releases/tag/20.20.1","label":"https://github.com/asterisk/asterisk/releases/tag/20.20.1"},{"url":"https://github.com/asterisk/asterisk/releases/tag/21.12.3","label":"https://github.com/asterisk/asterisk/releases/tag/21.12.3"},{"url":"https://github.com/asterisk/asterisk/releases/tag/22.10.1","label":"https://github.com/asterisk/asterisk/releases/tag/22.10.1"},{"url":"https://github.com/asterisk/asterisk/releases/tag/23.4.1","label":"https://github.com/asterisk/asterisk/releases/tag/23.4.1"},{"url":"https://github.com/asterisk/asterisk/releases/tag/certified-20.7-cert11","label":"https://github.com/asterisk/asterisk/releases/tag/certified-20.7-cert11"},{"url":"https://github.com/asterisk/asterisk/releases/tag/certified-22.8-cert3","label":"https://github.com/asterisk/asterisk/releases/tag/certified-22.8-cert3"},{"url":"https://github.com/asterisk/asterisk/tree/24.0.0-pre1","label":"https://github.com/asterisk/asterisk/tree/24.0.0-pre1"}],"tags":["cve.org"],"ingestedAt":"2026-10-27T17:33:23.793Z","slug":"CVE-2026-57194","body":"## Overview\n\nAsterisk 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 out-of-bounds write in `chan_unistim` `DIALPAGE` digit handling can overflow the `phone_number` field and crash Asterisk when an attacker sends a carefully crafted incoming request packet. The `chan_unistim` module must be loaded and configured with a valid `UNISTIM UDP port` that the attacker can reach. The attacker must register as a configured `phone MAC`, or the deployment must have an equivalent `production/autoprovisioning` path that allows the client to reach the main page. 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.\n\n## Affected\n\n- `asterisk < 20.20.1`\n- `asterisk >= 21.0.0-pre1, < 21.12.3`\n- `asterisk >= 22.0.0-pre1, < 22.10.1`\n- `asterisk >= 23.0.0-pre1, < 23.4.1`\n- `certified-asterisk < 20.7-cert11`\n- `certified-asterisk >= 22.8-cert1-pre1, < 22.8-cert3`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"sunlit","depthScore":32,"depthScoreParts":{"impact":32.5,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}