{"id":"CVE-2026-57185","kind":"vulnerability","aliases":["CVE-2026-57185"],"related":[],"title":"Asterisk: crafted SIP NOTIFY crashes PBX via buffer over-read","description":"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 attacker may crash Asterisk through a buffer over-read in the `PJSIP MWI body parser` by sending a carefully crafted `SIP NOTIFY` request. The attacker must pass SIP authentication using either a username/password or `source IP address matching`. 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.","summary":"Asterisk's PJSIP MWI body parser reads past the end of a buffer when handling a crafted SIP NOTIFY request. An authenticated attacker can crash the Asterisk process, causing a denial of service.","severity":"medium","cvss":6.5,"epss":null,"exploited":false,"exploited_at":null,"products":[],"ecosystems":[],"tags":["asterisk","package","pbx","pjsip","self-hosted","voip"],"not_affected_if":["auth-required","no-pjsip"],"how_to_check":"- Run `asterisk -V` and compare against the fixed versions: 20.20.1, 21.12.3, 22.10.1, 23.4.1, or Certified Asterisk 20.7-cert11 and 22.8-cert3.\n- Check that PJSIP is in use (`pjsip show endpoints`); the MWI body parser is part of the PJSIP channel driver.","fix":"- Upgrade Asterisk to `20.20.1`, `21.12.3`, `22.10.1` or `23.4.1`, or Certified Asterisk to `20.7-cert11` or `22.8-cert3`, matching your release line.","status":"open","published_at":"2026-10-27T17:17:01+00:00","first_seen_at":"2026-10-27T17:32:46+00:00","triaged_at":"2026-10-27T17:34:46+00:00","updated_at":"2026-10-27T17:34:46+00:00","category":"package","confidence":0.7,"triage":{"at":"2026-10-27T17:34:46Z","model":"claude-haiku-5-5","output":{"fix":"- Upgrade Asterisk to `20.20.1`, `21.12.3`, `22.10.1` or `23.4.1`, or Certified Asterisk to `20.7-cert11` or `22.8-cert3`, matching your release line.","reach":"network","title":"Asterisk: crafted SIP NOTIFY crashes PBX via buffer over-read","impact":"low","summary":"Asterisk's PJSIP MWI body parser reads past the end of a buffer when handling a crafted SIP NOTIFY request. An authenticated attacker can crash the Asterisk process, causing a denial of service.","category":"package","nicknames":[],"who_cares":["asterisk","pbx","voip","pjsip","self-hosted"],"confidence":0.7,"needs_auth":"yes","worst_case":"Asterisk process crashes, interrupting telephony service until restart","analyst_note":"","how_to_check":"- Run `asterisk -V` and compare against the fixed versions: 20.20.1, 21.12.3, 22.10.1, 23.4.1, or Certified Asterisk 20.7-cert11 and 22.8-cert3.\n- Check that PJSIP is in use (`pjsip show endpoints`); the MWI body parser is part of the PJSIP channel driver.","needs_analyst":false,"not_affected_if":["auth-required","no-pjsip"],"who_is_affected":"Systems running Asterisk with the PJSIP channel driver, where SIP peers can authenticate with a username and password or are matched by source IP address. The attacker must pass SIP authentication first, so exposure is limited to trusted or authenticated peers. Deployments using only chan_sip or without PJSIP trunks or endpoints can skip it.","user_interaction":"no","needs_special_setup":"yes","severity_if_unknown":"unknown"},"cost_usd":0.000662,"input_tokens":3450,"output_tokens":634,"severity_before":"medium"},"analyst_status":null,"analyst_note":null,"search":"'-2026':13A,16A '-57185':14A,17A '20.20.1':73C,131C '20.7':80C,138C '21.12.3':74C,132C '22.10.1':75C,133C '22.8':82C,140C '23.4.1':76C,134C 'address':123C 'asterisk':1A,18B,26B,52B,59C,72C,79C,89C,130C,137C 'attack':48B,86C,111C 'authent':47B,85C,115C 'bodi':30B,100C 'branch':65C 'buffer':8A,38B,92C 'care':105C 'caus':54B 'cert11':81C,139C 'cert3':83C,141C 'certifi':78C,136C 'craft':2A,42B,106C 'crash':5A,50B,88C 'cve':12A,15A 'denial':56B 'either':117C 'end':35B 'exchang':66C 'fix':128C 'handl':40B 'host':24B 'ip':122C 'issu':126C 'match':124C 'may':87C 'must':112C 'mwi':29B,99C 'notifi':4A,44B,108C 'open':62C 'over-read':9A,93C 'packag':19B 'parser':31B,101C 'pass':113C 'past':33B 'pbx':6A,20B 'pjsip':21B,28B,98C 'prior':70C 'privat':64C 'process':53B 'read':11A,32B,95C 'request':45B,109C 'self':23B 'self-host':22B 'send':103C 'servic':58B 'sip':3A,43B,107C,114C 'sourc':63C,121C 'telephoni':68C 'toolkit':69C 'use':116C 'username/password':119C 'via':7A 'voip':25B","nicknames":[],"mitigations":[],"who_affected":"Systems running Asterisk with the PJSIP channel driver, where SIP peers can authenticate with a username and password or are matched by source IP address. The attacker must pass SIP authentication first, so exposure is limited to trusted or authenticated peers. Deployments using only chan_sip or without PJSIP trunks or endpoints can skip it.","tier":"C","verified":{},"analyst_revisit_at":null,"first_public_at":"2026-10-27T17:17:01+00:00","kev":null,"cvss_vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","cvss_by":"security-advisories@github.com","poc_count":0,"sources":[{"source":"nvd","external_id":"CVE-2026-57185","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-57185","severity":null,"published_at":"2026-10-27T17:17:01+00:00","modified_at":"2026-10-27T17:17:01+00:00","first_seen_at":"2026-10-27T17:32:46+00:00","fetched_at":"2026-10-27T17:32:46+00:00","note":null}],"documents":[],"notice":"Free to read at a human pace. An API with keys and an MCP server are in preparation; early access: hello@infrastack.ai"}