Kamailio 5.5 Configuration File src/core/cfg.lex sr_push_yy_state use after free ⚔ [Disputed]
Summary
A vulnerability was found in Kamailio 5.5. It has been rated as problematic. The impacted element is the function sr_push_yy_state of the file src/core/cfg.lex of the component Configuration File Handler. This manipulation causes use after free.
This vulnerability is registered as CVE-2025-12205. The attack needs to be launched locally. Furthermore, an exploit is available.
It is still unclear if this vulnerability genuinely exists.
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.
Details
A vulnerability was found in Kamailio 5.5. It has been declared as problematic. Affected by this vulnerability is the function sr_push_yy_state of the file src/core/cfg.lex of the component Configuration File Handler. The manipulation with an unknown input leads to a use after free vulnerability. The CWE definition for the vulnerability is CWE-416. Referencing memory after it has been freed can cause a program to crash, use unexpected values, or execute code. As an impact it is known to affect confidentiality, integrity, and availability.
It is possible to read the advisory at shimo.im. This vulnerability is known as CVE-2025-12205. The exploitation appears to be easy. Attacking locally is a requirement. Technical details and also a public exploit are known.
It is possible to download the exploit 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 271819 (Linux Distros Unpatched Vulnerability : CVE-2025-12205), 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 (271819) and EUVD (EUVD-2025-36071). Additional details are provided at openwall.com. Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.
Product
Name
Version
CPE 2.3
CPE 2.2
CVSSv4
VulDB Vector: 🔒VulDB Reliability: 🔍
CNA CVSS-B Score: 🔒
CNA CVSS-BT Score: 🔒
CNA Vector: 🔒
CVSSv3
VulDB Meta Base Score: 6.1VulDB Meta Temp Score: 6.0
VulDB Base Score: 5.3
VulDB Temp Score: 4.8
VulDB Vector: 🔒
VulDB Reliability: 🔍
NVD Base Score: 7.8
NVD Vector: 🔒
CNA Base Score: 5.3
CNA Vector: 🔒
CVSSv2
| AV | AC | Au | C | I | A |
|---|---|---|---|---|---|
| 💳 | 💳 | 💳 | 💳 | 💳 | 💳 |
| 💳 | 💳 | 💳 | 💳 | 💳 | 💳 |
| 💳 | 💳 | 💳 | 💳 | 💳 | 💳 |
| Vector | Complexity | Authentication | Confidentiality | Integrity | Availability |
|---|---|---|---|---|---|
| Unlock | Unlock | Unlock | Unlock | Unlock | Unlock |
| Unlock | Unlock | Unlock | Unlock | Unlock | Unlock |
| Unlock | Unlock | Unlock | Unlock | Unlock | Unlock |
VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍
Exploiting
Class: Use after freeCWE: CWE-416 / CWE-119
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: 🔒
| 0-Day | Unlock | Unlock | Unlock | Unlock |
|---|---|---|---|---|
| Today | Unlock | Unlock | Unlock | Unlock |
Nessus ID: 271819
Nessus Name: Linux Distros Unpatched Vulnerability : CVE-2025-12205
Threat Intelligence
Interest: 🔍Active Actors: 🔍
Active APT Groups: 🔍
Countermeasures
Recommended: no mitigation knownStatus: 🔍
0-Day Time: 🔒
Timeline
10/25/2025 Advisory disclosed10/25/2025 VulDB entry created
11/04/2025 VulDB entry last update
Sources
Advisory: shimo.imStatus: Not defined
Disputed: 🔍
CVE: CVE-2025-12205 (🔒)
GCVE (CVE): GCVE-0-2025-12205
GCVE (VulDB): GCVE-100-329875
EUVD: 🔒
scip Labs: https://www.scip.ch/en/?labs.20161013
Misc.: 🔒
Entry
Created: 10/25/2025 01:57 PMUpdated: 11/04/2025 12:05 AM
Changes: 10/25/2025 01:57 PM (56), 10/27/2025 04:57 AM (30), 10/27/2025 05:50 AM (1), 10/29/2025 04:00 AM (11), 11/01/2025 07:41 PM (2), 11/04/2025 12:05 AM (4)
Complete: 🔍
Submitter: zh_vul
Cache ID: 244::40
Submit
Accepted
- Submit #673225: Kamailio Project Kamailio SIP Server 5.5 Use After Free (by zh_vul)
Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.
No comments yet. Languages: en.
Please log in to comment.