Buffer overflow in Asterisk
CVE-2026-57199
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, `app_sms.c` copies externally controlled `SMS` lengths into `fixed in-struct buffers` without sufficient bounds checks, allowing an attacker to corrupt memory or crash Asterisk. The administrator must explicitly use the `SMS` dialplan application, which is useful when routing calls to or from `analog devices`, and must not have ensured that data passed to the application is valid. 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.
Vulnerability class: Buffer Overflow
Published .
EPSS exploit prediction
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Affected products
- Asterisk — versions < 20.20.1, >= 21.0.0-pre1, < 21.12.3, >= 22.0.0-pre1, < 22.10.1
- Asterisk Certified-Asterisk — versions < 20.7-cert11, >= 22.8-cert1-pre1, < 22.8-cert3
Weakness classification (CWE)
References
- github.com/asterisk/asterisk/security/advisories/GHSA-q9fr-m7g8-6ph5
- github.com/asterisk/asterisk/commit/15c66022dc441ec63d7bd5f53cf7f35db72964be
- github.com/asterisk/asterisk/commit/38a2059eb77a91a6b6e76eeba5875c2b96027368
- github.com/asterisk/asterisk/commit/59b74276f24ba104d859f3f05897c9b8d835a28a
- github.com/asterisk/asterisk/commit/60f4ef3deac6b9af30519b46c13f103264038b82
- github.com/asterisk/asterisk/commit/661d6a2fc5cc7744ab9d849ed3c73ae5066386df
- github.com/asterisk/asterisk/commit/7048a3841df99e090b9d87246600373581629c98
- github.com/asterisk/asterisk/commit/f46f63bd4d33665d336cf8b5998650b915222549
- github.com/asterisk/asterisk/releases/tag/20.20.1
- github.com/asterisk/asterisk/releases/tag/21.12.3