Null Pointer Dereference Vulnerability in Kamailio SIP Server 5.5
CVE-2025-12206

4.8MEDIUM

Key Information:

Vendor

Kamailio

Status
Kamailio
Vendor
CVE Published:
27 October 2025

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2025-12206?

A significant flaw exists in the Kamailio SIP Server 5.5, specifically within the 'rve_is_constant' function located in 'src/core/rvalue.c'. This vulnerability leads to a null pointer dereference, which could be exploited by attackers with local access to the system. Reports indicate that the exploit has already been published, allowing potential attackers to leverage this weakness. Notably, the vendor has been alerted about this issue but has yet to provide a response or remediation.

Affected Version(s)

Kamailio 5.5

Exploit Proof of Concept (PoC)

PoC code is written by security researchers to demonstrate the vulnerability can be exploited. PoC code is also a key component for weaponization which could lead to ransomware.

CVE-2025-12206 - Proof of Concept

References

https://vuldb.com/?id.329876
vdb-entrytechnical-description
https://vuldb.com/?ctiid.329876
signaturepermissions-required
https://vuldb.com/?submit.673240
third-party-advisory

CVSS V4

Score:
4.8
Severity:
MEDIUM
Confidentiality:
None
Integrity:
None
Availability:
Low
Attack Vector:
Local
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • 🟡

    Public PoC available

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

Credit

zh_vul (VulDB User)
.