Stack-based buffer overflow in freeswitch - CVE-2023-40019
Published: September 13, 2023 / Updated: May 15, 2026
Vulnerability identifier: #VU131565
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-2023-40019
CWE-ID: CWE-121
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: www.freeswitch.org
Affected software:
freeswitch
freeswitch
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 SDP negotiation logic when processing a re-INVITE with SDP containing duplicate codec names. A remote attacker can send a specially crafted re-INVITE to cause a denial of service.
The issue can be triggered during codec re-negotiation after a call has completed initial codec negotiation. The reproduced scenario requires the mod_av and mod_opus modules to be loaded.
How to mitigate CVE-2023-40019
Install security update from vendor's website.