CVE-2025-12206 Kamailio rvalue.c rve_is_constant null pointer dereference
A local attacker with config file access can trigger a null pointer dereference in Kamailio, causing a denial of service.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2025-12206?
CVE-2025-12206 is a medium-severity vulnerability in Kamailio, published on 27 Oct 2025. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
A flaw has been found in Kamailio 5.5. The impacted element is the function rve_is_constant of the file src/core/rvalue.c. This manipulation causes null pointer dereference. The attack needs to be launched locally. The exploit has been published and may be used. It is still unclear if this vulnerability genuinely exists. This attack requires manipulating config files which might not be a realistic scenario in many cases. The vendor was contacted early about this disclosure but did not respond in any way.
Which versions are affected by CVE-2025-12206?
It affects 1 product.
Products include Kamailio Kamailio.
How do I fix CVE-2025-12206?
No fix has been published for CVE-2025-12206 yet. Limit exposure of the affected software until one is available.
Is CVE-2025-12206 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2025-12206 exists.
Other vulnerabilities in Kamailio
Sources
Also known as DEBIAN-CVE-2025-12206, GHSA-rj3x-qp7v-5vp5, UBUNTU-CVE-2025-12206.