NULL pointer dereference in pjsip - #VU150693
Published: September 17, 2026 / Updated: September 17, 2026
Vulnerability identifier: #VU150693
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: N/A
CWE-ID: CWE-476
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 a null pointer dereference in calculate_response_expiration() in the SIP registration client when processing a 2xx response to an outgoing REGISTER containing a wildcard Contact header. A remote attacker can send a crafted 2xx response containing a wildcard Contact header to cause a denial of service.
The affected registration-client path is enabled by default.
Affected software
pjsip
Remediation
Install security update from vendor's website.
pjsip - update to 2.18