CVE-2025-12207

A vulnerability has been found in Kamailio 5.5. This affects the function yyerror_at of the file src/core/cfg.y of the component Grammar Rule Handler. Such manipulation leads to null pointer dereference. The attack needs to be performed locally. The exploit has been disclosed to the public and may be used. The actual existence of this vulnerability is currently in question. 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.

CVSS 4.0

1.9CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:P

CVSS 3.1

5.5CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

EPSS

0.2% chance of exploitation in the next 30 days; higher than 13% of CVEs (scores of 2026-10-25)

CWEs

CWE-476, CWE-404

Published

2025-10-27

Modified

2026-10-19

Record from

the NVD, synced 2026-10-19

Affected

• kamailio:kamailio

References

• https://shimo.im/docs/vVqRMVMlrycMO63y/
• https://vuldb.com/?ctiid.329877
• https://vuldb.com/?id.329877
• https://vuldb.com/?submit.673241
• https://www.openwall.com/lists/oss-security/2025/11/02/3

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