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 v4.0: 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/E:U/U:Green
CVE-ID: CVE-2026-57201
CWE-ID: CWE-121
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: Digium (Linux Support Services)
Affected software:
Asterisk Open Source
Certified Asterisk
Asterisk Open Source
Certified Asterisk
Detailed vulnerability description
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.
How to mitigate CVE-2026-57201
Install security update from vendor's website.