# CVE-2025-12204: Kamailio Configuration File rvalue.c rve_destroy heap-based overflow

> A heap-based buffer overflow in Kamailio's configuration handler allows local attackers to potentially execute code or cause denial of service.

- **Severity:** Medium 4.8 (`CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Local or same network only
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 27 Oct 2025
- **Updated:** 24 Feb 2026
- **Also known as:** DEBIAN-CVE-2025-12204, GHSA-2w76-84vx-75wq, UBUNTU-CVE-2025-12204

## What is CVE-2025-12204?

CVE-2025-12204 is a medium-severity memory corruption vulnerability in Kamailio, published on 27 Oct 2025. It can only be exploited from the same machine or local network, with no action from the victim.

### Official description

A security vulnerability has been detected in Kamailio 5.5. Impacted is the function rve_destroy of the file src/core/rvalue.c of the component Configuration File Handler. The manipulation leads to heap-based buffer overflow. The attack must be carried out locally. The exploit has been disclosed publicly and may be used. There is ongoing doubt regarding the real existence of this vulnerability. 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.

Weakness: CWE-122 (Heap-based Buffer Overflow), CWE-787 (Out-of-bounds Write), CWE-119 (Improper Restriction of Operations within the Bounds of a Memory Buffer)

## Which versions are affected by CVE-2025-12204?

It affects 1 product.


Products: Kamailio Kamailio.

## How do I fix CVE-2025-12204?

No fix has been published for CVE-2025-12204 yet. Limit exposure of the affected software until one is available.

## Is CVE-2025-12204 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2025-12204 exists.

## Other vulnerabilities in Kamailio

- [CVE-2020-27507](https://insights.sbomify.com/CVE-2020-27507/): Memory corruption in n/a (critical 9.8)
- [CVE-2013-7426](https://insights.sbomify.com/CVE-2013-7426/): File upload in n/a (critical 9.8)
- [CVE-2015-1590](https://insights.sbomify.com/CVE-2015-1590/): Path traversal in n/a (high 7.8)
- [CVE-2015-1591](https://insights.sbomify.com/CVE-2015-1591/): Privilege escalation in n/a (high 7.8)
- [CVE-2026-52022](https://insights.sbomify.com/CVE-2026-52022/): Denial of service in n/a (high 7.5)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2025-12204 and fix it if it is affected.

What it is: CVE-2025-12204 is a medium-severity memory corruption vulnerability in Kamailio, published on 27 Oct 2025. It can only be exploited from the same machine or local network, with no action from the victim.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2025-12204 exists.

Affected product: Kamailio. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2025-12204/ (Markdown: https://insights.sbomify.com/CVE-2025-12204/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2025-12204
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2025-12204
- OSV: https://osv.dev/vulnerability/CVE-2025-12204

---
From sbomify Insights: https://insights.sbomify.com/CVE-2025-12204/
Summaries are generated and may contain mistakes; the official description above is the record.