Improper Authentication in freeswitch - CVE-2021-37624
Published: October 25, 2021 / Updated: May 15, 2026
Vulnerability identifier: #VU131568
CSH Severity: Medium
CVSS v4.0: 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/E:U/U:Green
CVE-ID: CVE-2021-37624
CWE-ID: CWE-287
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 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.
How to mitigate CVE-2021-37624
Install security update from vendor's website.