What’s Vulnerable › Vulnerabilities

CVE-2025-12205: Kamailio Configuration File cfg.lex sr_push_yy_state use after free

• Severity: high (CVSS 7.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2025-10-27 · updated 2026-10-19
• Weakness: CWE-119

Description

A vulnerability was detected in Kamailio 5.5. The affected element is the function sr_push_yy_state of the file src/core/cfg.lex of the component Configuration File Handler. The manipulation results in use after free. The attack must be initiated from a local position. The exploit is now public and may be used. The real existence of this vulnerability is still doubted at the moment. 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 products

• Kamailio: 5.5.0

References

• https://shimo.im/docs/ZzkLMVMLOzIRlpAQ/
• https://vuldb.com/?ctiid.329875
• https://vuldb.com/?id.329875
• https://vuldb.com/?submit.673225
• https://www.openwall.com/lists/oss-security/2025/11/02/3
• http://www.openwall.com/lists/oss-security/2025/10/27/12
• http://www.openwall.com/lists/oss-security/2025/10/27/8
• https://www.openwall.com/lists/oss-security/2025/10/27/8

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