Kamailio 5.5 Grammar Rule src/core/cfg.y yyerror_at 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 identified as problematic has been detected in Kamailio 5.5. This impacts the function yyerror_at of the file src/core/cfg.y of the component Grammar Rule Handler. Performing a manipulation results in null pointer dereference. This vulnerability is reported as CVE-2025-12207. The attack requires a local approach. Moreover, an exploit is present. The existence of this vulnerability is still disputed at present. 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 classified as problematic has been found in Kamailio 5.5. This affects the function yyerror_at of the file src/core/cfg.y of the component Grammar Rule Handler. The manipulation with an unknown input leads to a null pointer dereference vulnerability. CWE is classifying the issue as 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. This is going to have an impact on availability.

The advisory is shared at shimo.im. This vulnerability is uniquely identified as CVE-2025-12207. The exploitability is told to be easy. An attack has to be approached locally. Technical details and a public exploit are known.

The exploit is shared for download 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 271828 (Linux Distros Unpatched Vulnerability : CVE-2025-12207), 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 (271828) and EUVD (EUVD-2025-36068). Further details are available at openwall.com. If you want to get the best quality for vulnerability data then you always have to consider VulDB.

Productinfo

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Version

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CNA CVSS-B Score: 🔒
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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: 271828
Nessus Name: Linux Distros Unpatched Vulnerability : CVE-2025-12207

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-2025-12207 (🔒)
GCVE (CVE): GCVE-0-2025-12207
GCVE (VulDB): GCVE-100-329877
EUVD: 🔒
scip Labs: https://www.scip.ch/en/?labs.20161013
Misc.: 🔒

Entryinfo

Created: 10/25/2025 13:57
Updated: 11/04/2025 00:06
Changes: 10/25/2025 13:57 (56), 10/27/2025 04:57 (30), 10/27/2025 05:50 (1), 10/29/2025 04:00 (11), 11/01/2025 19:41 (2), 11/04/2025 00:06 (4)
Complete: 🔍
Submitter: zh_vul
Cache ID: 216::103

Submitinfo

Accepted

  • Submit #673241: Kamailio Project Kamailio SIP Server 5.5 NULL Pointer Dereference (by zh_vul)

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