CVE-2025-12207
Kamailio Grammar Rule cfg.y yyerror_at null pointer dereference
- State
- Published
- Severity
- 4.8 Medium
- Published
- Oct 27, 2025
- Updated
- Feb 24, 2026
- Reserved
- Oct 25, 2025
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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 4.0 | 4.8 Medium | CVSS: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 | VulDB |
| 3.1 | 3.3 Low | 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 | VulDB |
| 3.0 | 3.3 Low | CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L/E:P/RL:X/RC:R | VulDB |
| 2.0 | 1.7 Low | AV:L/AC:L/Au:S/C:N/I:N/A:P/E:POC/RL:ND/RC:UR | VulDB |
Weaknesses
Affected Products
| Product | Versions |
|---|---|
Kamailion/a |
|
References
- VDB-329877 | Kamailio Grammar Rule cfg.y yyerror_at null pointer dereferencevdb-entrytechnical-description
- VDB-329877 | CTI Indicators (IOB, IOC, IOA)signaturepermissions-required
- Submit #673241 | Kamailio Project Kamailio SIP Server 5.5 NULL Pointer Dereferencethird-party-advisory
- https://shimo.im/docs/vVqRMVMlrycMO63y/exploit
- https://www.openwall.com/lists/oss-security/2025/11/02/3related
- https://www.openwall.com/lists/oss-security/2025/10/27/8
- http://www.openwall.com/lists/oss-security/2025/10/27/12
- http://www.openwall.com/lists/oss-security/2025/10/27/8
- https://shimo.im/docs/vVqRMVMlrycMO63yexploit
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