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 cause a stack buffer overflow in `res_xmpp` `XMPP namespace prefix` handling using carefully crafted packets. The `res_xmpp` module must be loaded, an XMPP connection must be configured in `xmpp.conf`, and the attacker must have an XMPP account on the same or a federated server. 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.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| asterisk | asterisk | < 20.20.1, >= 21.0.0-pre1, < 21.12.3, >= 22.0.0-pre1, < 22.10.1, >= 23.0.0-pre1, < 23.4.1 | — |
| asterisk | certified-asterisk | < 20.7-cert11, >= 22.8-cert1-pre1, < 22.8-cert3 | — |
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | asterisk | 1:22.10.1+dfsg+~cs6.17.60671434-1 | — |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 26.10 | asterisk | No fix yet | — |
| Ubuntu 26.04 LTS | asterisk | No fix yet | — |
| Ubuntu 24.04 LTS | asterisk | No fix yet | — |
| Ubuntu 22.04 LTS | asterisk | No fix yet | — |
| Ubuntu 20.04 LTS | asterisk | No fix yet | — |
Show 2 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 18.04 LTS | asterisk | No fix yet | — |
| Ubuntu Pro 16.04 LTS | asterisk | No fix yet | — |
Advisories 1
- WID-SEC-2026-2094 Digium Certified Asterisk: Mehrere Schwachstellen BSI CERT-Bund (WID) · Nov 4, 2026
References
- https://github.com/asterisk/asterisk/security/advisories/GHSA-mxgm-8c6f-5p8f
- https://github.com/asterisk/asterisk/commit/12072a559f592736a44dd9fbe1594e84714edfb4
- https://github.com/asterisk/asterisk/commit/1328dbb503da4aa11a480a9c28e170f17e5f4e84
- https://github.com/asterisk/asterisk/commit/3c4b08cf94eeaa3faefb3ae6c2d6ce1bd9747a13
- https://github.com/asterisk/asterisk/commit/433102c16b8edfc31d28c96166fef03fe72fb923
- https://github.com/asterisk/asterisk/commit/5e626250628b2579530f3f17e7b0aa37d082873b
- https://github.com/asterisk/asterisk/commit/d570a85e45153a36919ace5d0ab06a195b30f9d1
- https://github.com/asterisk/asterisk/commit/e329a6803ac5214028f98cc5f0b7167d66e32c08
- https://github.com/asterisk/asterisk/releases/tag/20.20.1
- https://github.com/asterisk/asterisk/releases/tag/21.12.3
- https://github.com/asterisk/asterisk/releases/tag/22.10.1
- https://github.com/asterisk/asterisk/releases/tag/23.4.1
- https://github.com/asterisk/asterisk/releases/tag/certified-20.7-cert11
- https://github.com/asterisk/asterisk/releases/tag/certified-22.8-cert3
- https://github.com/asterisk/asterisk/tree/24.0.0-pre1