Heap-Based Buffer Overflow Vulnerability in Kamailio SIP Server
CVE-2025-12204

4.8MEDIUM

Key Information:

Vendor

Kamailio Project

Status
Kamailio
Vendor
CVE Published:
27 October 2025

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2025-12204?

A vulnerability has been found in the Kamailio SIP Server version 5.5, specifically within the rve_destroy function located in src/core/rvalue.c. This issue can lead to a heap-based buffer overflow, which poses significant security risks. As the attack requires local access, it presents challenges in exploitation but has been publicly disclosed, raising concerns for users of the affected version. The vendor has been notified but has not yet responded, emphasizing the importance of prompt action for those using Kamailio 5.5 to ensure their systems are adequately protected against potential threats.

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-2025-12204 - Proof of Concept

References

https://vuldb.com/?id.329874
vdb-entrytechnical-description
https://vuldb.com/?ctiid.329874
signaturepermissions-required
https://vuldb.com/?submit.673224
third-party-advisory

CVSS V4

Score:
4.8
Severity:
MEDIUM
Confidentiality:
Low
Integrity:
Low
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)
.