Improper Authentication in freeswitch - CVE-2021-37624
Published: October 25, 2021 / Updated: May 15, 2026
Vulnerability identifier: #VU131568
CSH Severity: Medium
CVSS v4: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2021-37624
CWE-ID: CWE-287
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to spoof chat messages.
The vulnerability exists due to improper authentication in SIP MESSAGE request handling when relaying SIP MESSAGE requests to registered SIP user agents. A remote attacker can send a specially crafted SIP MESSAGE request to spoof chat messages.
Only systems using the default configuration with unauthenticated MESSAGE handling are vulnerable.
Affected software
freeswitch
How to mitigate CVE-2021-37624
Install security update from vendor's website.
freeswitch - update to 1.10.7