CVE-2025-12206

low-risk

Published 2025-10-27

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.

Do I need to act?

0.03% chance of exploitation

EPSS score — low exploit probability

Not on CISA KEV list

No confirmed active exploitation reported to CISA

Patch status unknown

Check vendor advisories for fix availability and mitigation guidance

CVSS 3.3/10 Low

LOCAL / LOW complexity

Affected Products (1)

Kamailio

Affected Vendors

Kamailio

References (9)

Exploit https://shimo.im/docs/aBAYMVMB2jUP9jAj/

Permissions Required https://vuldb.com/?ctiid.329876

Third Party Advisory https://vuldb.com/?id.329876

Third Party Advisory https://vuldb.com/?submit.673240

https://www.openwall.com/lists/oss-security/2025/11/02/3

http://www.openwall.com/lists/oss-security/2025/10/27/12

http://www.openwall.com/lists/oss-security/2025/10/27/8

Issue Tracking https://www.openwall.com/lists/oss-security/2025/10/27/8

Exploit https://shimo.im/docs/aBAYMVMB2jUP9jAj

/ 100

low-risk

Severity 13/34 · Low

Exploitability 0/34 · Minimal

Exposure 5/34 · Minimal