{"id":"CVE-2026-57200","kind":"vulnerability","aliases":["CVE-2026-57200"],"related":[],"title":"Asterisk: read-only ARI user can load modules and run code","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 22.8-cert3, an authenticated attacker with read-only permissions for the `Asterisk REST Interface (ARI)` may, under certain conditions, execute write operations through `REST-over-WebSocket`. The authorization bypass permits `arbitrary module path` loading and conditional remote code execution. 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 22.8-cert3.","summary":"Asterisk is an open source telephony toolkit (PBX). An attacker with read-only ARI credentials can send write operations over REST-over-WebSocket, bypassing authorization to load an arbitrary module path, which can lead to remote code execution.","severity":"high","cvss":7.5,"epss":null,"exploited":false,"exploited_at":null,"products":[],"ecosystems":[],"tags":["asterisk","package","self-hosted","telephony"],"not_affected_if":["auth-required","default-config"],"how_to_check":"- Check the Asterisk version with `asterisk -rx \"core show version\"`, and compare it against the fixed releases.\n- Check whether the HTTP server is enabled and reachable: look for `enabled = yes` under `[general]` in `http.conf` and for ARI settings in `ari.conf`.\n- Check whether ARI accounts with read-only permissions exist in `ari.conf`.","fix":"- Upgrade Asterisk to `20.20.1`, `21.12.3`, `22.10.1` or `23.4.1`.\n- Upgrade Certified Asterisk to `22.8-cert3`.\n- Until upgraded, disable the HTTP server or keep it bound to 127.0.0.1 and restrict access to ARI.","status":"open","published_at":"2026-10-27T21:18:06+00:00","first_seen_at":"2026-10-27T21:29:22+00:00","triaged_at":"2026-10-27T21:30:17+00:00","updated_at":"2026-10-27T21:30:17+00:00","category":"package","confidence":0.8,"triage":{"at":"2026-10-27T21:30:17Z","model":"claude-haiku-5-5","output":{"fix":"- Upgrade Asterisk to `20.20.1`, `21.12.3`, `22.10.1` or `23.4.1`.\n- Upgrade Certified Asterisk to `22.8-cert3`.\n- Until upgraded, disable the HTTP server or keep it bound to 127.0.0.1 and restrict access to ARI.","reach":"network","title":"Asterisk: read-only ARI user can load modules and run code","impact":"high","summary":"Asterisk is an open source telephony toolkit (PBX). An attacker with read-only ARI credentials can send write operations over REST-over-WebSocket, bypassing authorization to load an arbitrary module path, which can lead to remote code execution.","category":"package","nicknames":[],"who_cares":["asterisk","telephony","self-hosted"],"confidence":0.8,"needs_auth":"yes","worst_case":"Authenticated attacker loads a module and runs code on the server","analyst_note":"","how_to_check":"- Check the Asterisk version with `asterisk -rx \"core show version\"`, and compare it against the fixed releases.\n- Check whether the HTTP server is enabled and reachable: look for `enabled = yes` under `[general]` in `http.conf` and for ARI settings in `ari.conf`.\n- Check whether ARI accounts with read-only permissions exist in `ari.conf`.","needs_analyst":false,"not_affected_if":["default-config","auth-required"],"who_is_affected":"Systems running Asterisk with the HTTP web server enabled and reachable over the network, and with ARI read-only credentials in use. HTTP is disabled by default and binds only to 127.0.0.1 by default, so default installs are not exposed. Teams running only default configurations on a closed network can skip it.","user_interaction":"no","needs_special_setup":"yes","severity_if_unknown":"high"},"cost_usd":0.000673,"input_tokens":3508,"output_tokens":644,"severity_before":"high"},"analyst_status":null,"analyst_note":null,"search":"'-2026':14A,17A '-57200':15A,18A '127.0.0.1':158C '20.20.1':79C,170C '21.12.3':80C,171C '22.10.1':81C,172C '22.8':86C,177C '23.4.1':82C,173C 'alreadi':141C 'arbitrari':55B,118C 'ari':5A,39B,101C,147C 'asterisk':1A,19B,25B,65C,78C,85C,98C,128C,169C,176C 'attack':34B,90C,139C 'authent':89C 'author':51B,115C 'bind':155C 'branch':71C 'bypass':50B,116C 'cert3':87C,178C 'certain':104C 'certifi':84C,175C 'code':12A,63B,125C 'condit':105C,123C 'credenti':40B,148C 'cve':13A,16A 'default':153C,160C 'disabl':151C 'enabl':134C,163C 'even':161C 'exchang':72C 'execut':64B,106C,126C 'fix':167C 'host':23B 'http':129C,149C 'interfac':100C 'issu':165C 'lead':60B 'load':8A,53B,121C 'may':102C 'modul':9A,56B,119C 'must':132C,140C 'open':28B,68C 'oper':44B,108C 'packag':20B 'path':57B,120C 'pbx':32B 'permiss':95C 'permit':117C 'prior':76C 'privat':70C 'reachabl':136C 'read':3A,37B,93C,145C 'read-on':2A,36B,92C,144C 'remot':62B,124C 'rest':47B,99C,111C 'rest-over-websocket':46B,110C 'run':11A 'self':22B 'self-host':21B 'send':42B 'server':131C 'sourc':29B,69C 'telephoni':24B,30B,74C 'toolkit':31B,75C 'user':6A 'valid':143C 'web':130C 'websocket':49B,113C 'write':43B,107C","nicknames":[],"mitigations":[],"who_affected":"Systems running Asterisk with the HTTP web server enabled and reachable over the network, and with ARI read-only credentials in use. HTTP is disabled by default and binds only to 127.0.0.1 by default, so default installs are not exposed. Teams running only default configurations on a closed network can skip it.","tier":"B","verified":{},"analyst_revisit_at":null,"first_public_at":"2026-10-27T21:18:06+00:00","kev":null,"cvss_vector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H","cvss_by":"security-advisories@github.com","poc_count":0,"sources":[{"source":"nvd","external_id":"CVE-2026-57200","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-57200","severity":null,"published_at":"2026-10-27T21:18:06+00:00","modified_at":"2026-10-27T21:18:06+00:00","first_seen_at":"2026-10-27T21:29:22+00:00","fetched_at":"2026-10-27T21:29:22+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"}