Stack-based buffer overflow in Asterisk Open Source and Certified Asterisk - CVE-2026-57201
Published: June 26, 2026
Vulnerability identifier: #VU135544
CSH Severity: Medium
CVSS v4: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-57201
CWE-ID: CWE-121
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to cause a denial of service.
The vulnerability exists due to stack-based buffer overflow in the H.323 ooh323c_trace function when processing a crafted H.323 packet. A remote attacker can send a specially crafted packet to cause a denial of service.
Only systems with the chan_ooh323 addon channel driver explicitly compiled and installed are vulnerable.
Affected software
Asterisk Open Source
Certified Asterisk
Certified Asterisk
How to mitigate CVE-2026-57201
Install security update from vendor's website.
Asterisk Open Source - addressed in versions 20.20.1, 21.12.3, 22.10.1, 23.4.1
Certified Asterisk - addressed in versions 20.7-cert11, 22.8-cert3
Certified Asterisk - addressed in versions 20.7-cert11, 22.8-cert3