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Vulnerability · Published Oct 27, 2025 · Assigned by VulDB

CVE-2025-12207Kamailio Grammar Rule cfg.y yyerror_at null pointer dereference

Low 3.3

In plain English

A low-severity null pointer dereference in Kamailio. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 14% of all known vulnerabilities).

Severity (CVSS 3.1)3.3Low
Exploit odds (30 days)0.2%top 85.8% of all CVEs
Exploited in the wildNo reportsCISA SSVC: poc
Attack toolingNoneno public tooling known

Official description

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.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Debian:12kamailiono fix listedDEBIAN-CVE-2025-12207
Debian:13kamailiono fix listedDEBIAN-CVE-2025-12207
Debian:14kamailiono fix listedDEBIAN-CVE-2025-12207
Ubuntu:22.04:LTSkamailiono fix listedUBUNTU-CVE-2025-12207
Ubuntu:24.04:LTSkamailiono fix listedUBUNTU-CVE-2025-12207
Ubuntu:25.10kamailiono fix listedUBUNTU-CVE-2025-12207
Ubuntu:26.04:LTSkamailiono fix listedUBUNTU-CVE-2025-12207
Ubuntu:26.10kamailiono fix listedUBUNTU-CVE-2025-12207

Affected products (as reported)

VendorProductVersions
n/a Kamailio 5.5

Weakness: CWE-476, CWE-404 · Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L/E:P/RL:X/RC:R

References