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

Quick assessment

Affected
n/a Kamailio
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Kamailio是Kamailio开源的一个 SIP 信令服务器的开源实现。 Kamailio 5.5版本存在资源管理错误漏洞，该漏洞源于文件src/core/cfg.lex中函数sr_push_yy_state存在释放后重用问题。

CVSS 5.3 · Medium EPSS 0.23% · P12
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I. Basic Information for CVE-2025-12205

Vulnerability Information
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Vulnerability Title
Kamailio Configuration File cfg.lex sr_push_yy_state use after free
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
释放后使用
Source: CVE Program / CVE List V5
Vulnerability Title
Kamailio 资源管理错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Kamailio是Kamailio开源的一个 SIP 信令服务器的开源实现。 Kamailio 5.5版本存在资源管理错误漏洞，该漏洞源于文件src/core/cfg.lex中函数sr_push_yy_state存在释放后重用问题。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
- Kamailio 5.5 cpe:2.3:a:kamailio:kamailio:*:*:*:*:*:*:*:*

II. Public POCs for CVE-2025-12205

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III. Intelligence Information for CVE-2025-12205

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Vendor Advisories for CVE-2025-12205 (2)

News Coverage for CVE-2025-12205 (1)

Same Patch Batch · n/a · 2025-10-27 · 45 CVEs total

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CVE-2025-12207 3.3 LOW Kamailio Grammar Rule cfg.y yyerror_at null pointer dereference
CVE-2025-12206 3.3 LOW Kamailio rvalue.c rve_is_constant null pointer dereference
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Showing top 20 of 45 CVEs. View all on vendor page → →

IV. Related Vulnerabilities

Same product: Kamailio
Same vendor: n/a
Same weakness: CWE-416

V. Comments for CVE-2025-12205

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