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Description

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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.

Es wurde eine Schwachstelle in Kamailio 5.5 entdeckt. Betroffen hiervon ist die Funktion yyerror_at der Datei src/core/cfg.y der Komponente Grammar Rule Handler. Durch das Beeinflussen mit unbekannten Daten kann eine null pointer dereference-Schwachstelle ausgenutzt werden. Der Angriff muss lokal passieren. Die Schwachstelle wurde öffentlich offengelegt und könnte ausgenutzt werden. Die wahre Existenz der vermeintlichen Schwachstelle wird zur Zeit in Frage gestellt.

PUBLISHED Reserved 2025-10-25 | Published 2025-10-27 | Updated 2025-11-04 | Assigner VulDB




MEDIUM: 4.8CVSS: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
LOW: 3.3CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L/E:P/RL:X/RC:R
LOW: 3.3CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L/E:P/RL:X/RC:R
1.7AV:L/AC:L/Au:S/C:N/I:N/A:P/E:POC/RL:ND/RC:UR

Problem types

NULL Pointer Dereference

Denial of Service

Timeline

2025-10-25:Advisory disclosed
2025-10-25:VulDB entry created
2025-11-04:VulDB entry last update

Credits

zh_vul (VulDB User) reporter

References

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

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

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

shimo.im/docs/vVqRMVMlrycMO63y exploit

vuldb.com/?id.329877 (VDB-329877 | Kamailio Grammar Rule cfg.y yyerror_at null pointer dereference) vdb-entry technical-description

vuldb.com/?ctiid.329877 (VDB-329877 | CTI Indicators (IOB, IOC, IOA)) signature permissions-required

vuldb.com/?submit.673241 (Submit #673241 | Kamailio Project Kamailio SIP Server 5.5 NULL Pointer Dereference) third-party-advisory

shimo.im/docs/vVqRMVMlrycMO63y/ exploit

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

cve.org (CVE-2025-12207)

nvd.nist.gov (CVE-2025-12207)

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