Kamailio 5.5 src/core/rvalue.c rve_is_constant null pointer dereference ⚔ [Disputed]

CVSS Meta Temp Score
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CTI Interest Score
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3.9$0-$5k0.00

Summaryinfo

A vulnerability categorized as problematic has been discovered in Kamailio 5.5. This affects the function rve_is_constant of the file src/core/rvalue.c. Such manipulation leads to null pointer dereference. This vulnerability is documented as CVE-2025-12206. The attack needs to be performed locally. Additionally, an exploit exists. 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.

Detailsinfo

A vulnerability was found in Kamailio 5.5. It has been rated as problematic. Affected by this issue is the function rve_is_constant of the file src/core/rvalue.c. The manipulation with an unknown input leads to a null pointer dereference vulnerability. Using CWE to declare the problem leads to CWE-476. A NULL pointer dereference occurs when the application dereferences a pointer that it expects to be valid, but is NULL, typically causing a crash or exit. Impacted is availability.

The advisory is shared for download at shimo.im. This vulnerability is handled as CVE-2025-12206. The exploitation is known to be easy. The attack needs to be approached locally. Technical details as well as a public exploit are known.

The exploit is available at shimo.im. It is declared as proof-of-concept. The real existence of this vulnerability is still doubted at the moment. The vendor was contacted early about this disclosure but did not respond in any way. This attack requires manipulating config files which might not be a realistic scenario in many cases. The vulnerability scanner Nessus provides a plugin with the ID 271818 (Linux Distros Unpatched Vulnerability : CVE-2025-12206), which helps to determine the existence of the flaw in a target environment.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

The vulnerability is also documented in the databases at Tenable (271818) and EUVD (EUVD-2025-36070). openwall.com is providing further details. Once again VulDB remains the best source for vulnerability data.

Productinfo

Name

Version

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CNA CVSS-B Score: 🔒
CNA CVSS-BT Score: 🔒
CNA Vector: 🔒

CVSSv3info

VulDB Meta Base Score: 4.0
VulDB Meta Temp Score: 3.9

VulDB Base Score: 3.3
VulDB Temp Score: 3.0
VulDB Vector: 🔒
VulDB Reliability: 🔍

NVD Base Score: 5.5
NVD Vector: 🔒

CNA Base Score: 3.3
CNA Vector: 🔒

CVSSv2info

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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Null pointer dereference
CWE: CWE-476 / CWE-404
CAPEC: 🔒
ATT&CK: 🔒

Physical: Partially
Local: Yes
Remote: No

Availability: 🔒
Access: Public
Status: Proof-of-Concept
Download: 🔒

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

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Nessus ID: 271818
Nessus Name: Linux Distros Unpatched Vulnerability : CVE-2025-12206

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: no mitigation known
Status: 🔍

0-Day Time: 🔒

Timelineinfo

10/25/2025 Advisory disclosed
10/25/2025 +0 days VulDB entry created
11/04/2025 +9 days VulDB entry last update

Sourcesinfo

Advisory: shimo.im
Status: Not defined
Disputed: 🔍

CVE: CVE-2025-12206 (🔒)
GCVE (CVE): GCVE-0-2025-12206
GCVE (VulDB): GCVE-100-329876
EUVD: 🔒
scip Labs: https://www.scip.ch/en/?labs.20161013
Misc.: 🔒

Entryinfo

Created: 10/25/2025 13:57
Updated: 11/04/2025 00:05
Changes: 10/25/2025 13:57 (55), 10/27/2025 04:57 (30), 10/27/2025 05:50 (1), 10/29/2025 04:00 (11), 11/01/2025 20:48 (2), 11/04/2025 00:05 (4)
Complete: 🔍
Submitter: zh_vul
Cache ID: 216::103

Submitinfo

Accepted

  • Submit #673240: Kamailio Project Kamailio SIP Server 5.5 NULL Pointer Dereference (by zh_vul)

Once again VulDB remains the best source for vulnerability data.

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