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.
Attack Parameters
Attack Vector
Local
Requires local access
Attack Complexity
Low
Easy to exploit
Privileges Required
Low
Basic privileges needed
User Interaction
None
No user interaction needed
Impact Assessment
Confidentiality
None
No data leak
Integrity
None
No data modification
Availability
Low
Partial disruption
CVSS Vector v3.1
Weakness Type (CWE)
Vulnerable Products 1
| Configuration | From (including) | Up to (excluding) |
|---|---|---|
|
Kamailio Kamailio
cpe:2.3:a:kamailio:kamailio:5.5.0:*:*:*:*:*:*:*
|
— | — |
References 9
https://shimo.im/docs/vVqRMVMlrycMO63y/
cna@vuldb.com
https://vuldb.com/?ctiid.329877
cna@vuldb.com
https://vuldb.com/?id.329877
cna@vuldb.com
https://vuldb.com/?submit.673241
cna@vuldb.com
https://www.openwall.com/lists/oss-security/2025/11/02/3
cna@vuldb.com
http://www.openwall.com/lists/oss-security/2025/10/27/12
af854a3a-2127-422b-91ae-364da2661108
http://www.openwall.com/lists/oss-security/2025/10/27/8
af854a3a-2127-422b-91ae-364da2661108
https://www.openwall.com/lists/oss-security/2025/10/27/8
af854a3a-2127-422b-91ae-364da2661108
https://shimo.im/docs/vVqRMVMlrycMO63y
134c704f-9b21-4f2e-91b3-4a467353bcc0