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.
References10
- github.com/asterisk/asterisk/commit/051d29a0d35559e9165bab346de…
- github.com/asterisk/asterisk/commit/205c301a0a0b0d013d4ebdf1285…
- github.com/asterisk/asterisk/commit/762b4c9c39b28fa5564112b0f48…
- github.com/asterisk/asterisk/commit/87641e9b2cd62c998c5283400ba…
- github.com/asterisk/asterisk/commit/9d198a7d16ccba51507dfea6c1e…
- github.com/asterisk/asterisk/commit/c10cdbce072a708060cd38a89d6…
- github.com/asterisk/asterisk/releases/tag/20.20.1
- github.com/asterisk/asterisk/releases/tag/21.12.3
- github.com/asterisk/asterisk/releases/tag/22.10.1
- github.com/asterisk/asterisk/releases/tag/23.4.1
Metrics
- CVSS 3.1
-
7.5
HIGH
Score source: CNA
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H - EPSS — exploit probability
- 1% percentile: 59 · as of 3 November 2026
- CWE
- CWE-22CWE-863
Could this be exploited in your environment?
A patch closes the known hole. A penetration test shows what an attacker can still reach — with proof.