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, a stack buffer overflow in the H.323 `ooTrace()` trace-logging function can occur when unbounded `vsprintf` writes into a fixed `2048-byte buffer`. A remote attacker may send a carefully crafted packet that causes the Asterisk process to crash. The `chan_ooh323` addon channel driver must be explicitly compiled and installed, which is not the default, and its port must be publicly reachable. 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.
References10
- github.com/asterisk/asterisk/commit/2d7b8c8dc13d9ead8b6f36cc38b…
- github.com/asterisk/asterisk/commit/33f62e351642edd9c58ef97b000…
- github.com/asterisk/asterisk/commit/875ac7413de0b7068cd12d0da2f…
- github.com/asterisk/asterisk/commit/ac0a64dec6d4231bf005a68da6a…
- github.com/asterisk/asterisk/commit/bf0c9a906892bc0f91fa753476e…
- github.com/asterisk/asterisk/commit/c4d9b4defe83f74523880fd630c…
- github.com/asterisk/asterisk/commit/fff256d0539e96f70ac315844d7…
- 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
Metrics
- CVSS 3.1
-
7.5
HIGH
Score source: CNA
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H - EPSS — exploit probability
- 1% percentile: 53 · as of 5 November 2026
- CWE
- CWE-787
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.