CVE-2025-12207

Summary

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 Software

Weaknesses

• CWE-476: NULL Pointer Dereference
• CWE-404: Denial of Service

ADP Enrichment

CVE Program Container

Additional References

• 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

CISA ADP Vulnrichment

• SSVC:
• Exploitation: poc
  • Automatable: no
  • Technical Impact: partial

Additional References

• https://shimo.im/docs/vVqRMVMlrycMO63y

References

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

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