# CVE-2024-31949: Denial of service in n/a

> An attacker can cause a denial of service in FRRouting by sending malformed MP/GR capability data, triggering an infinite loop.

- **Severity:** Medium 6.5 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** A user has to click or open something
- **Fix available:** Yes
- **Published:** 7 Apr 2024
- **Updated:** 4 Nov 2025
- **Also known as:** DEBIAN-CVE-2024-31949, GHSA-f3q5-vrp5-crqj

## What is CVE-2024-31949?

CVE-2024-31949 is a medium-severity denial of service vulnerability in n/a, published on 7 Apr 2024. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.

### Official description

In FRRouting (FRR) through 9.1, an infinite loop can occur when receiving a MP/GR capability as a dynamic capability because malformed data results in a pointer not advancing.

Weakness: CWE-835 (Loop with Unreachable Exit Condition)

## Which versions are affected by CVE-2024-31949?

It affects 1 product.


Products: Frrouting Frrouting.

## How do I fix CVE-2024-31949?

Apply the vendor's patch.

## Is CVE-2024-31949 being exploited?

There is no known exploitation of CVE-2024-31949 in the wild and no public exploit code.

## Other vulnerabilities in n/a

- [CVE-2024-44070](https://insights.sbomify.com/CVE-2024-44070/): Denial of service in n/a (critical 9.8)
- [CVE-2023-38406](https://insights.sbomify.com/CVE-2023-38406/): bgpd/bgp_flowspec.c in FRRouting (FRR) before 8.4.3 mishandles an nlri length of zero, aka a "flowspec overflow." (critical 9.8)
- [CVE-2022-37035](https://insights.sbomify.com/CVE-2022-37035/): Use after free in n/a (high 8.1)
- [CVE-2022-26127](https://insights.sbomify.com/CVE-2022-26127/): Memory corruption in FRRouting (high 7.8)
- [CVE-2022-26128](https://insights.sbomify.com/CVE-2022-26128/): Memory corruption in FRRouting (high 7.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2024-31949 and fix it if it is affected.

What it is: CVE-2024-31949 is a medium-severity denial of service vulnerability in n/a, published on 7 Apr 2024. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Exploitation: There is no known exploitation of CVE-2024-31949 in the wild and no public exploit code.

Affected product: n/a. 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-2024-31949/ (Markdown: https://insights.sbomify.com/CVE-2024-31949/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2024-31949
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2024-31949
- OSV: https://osv.dev/vulnerability/CVE-2024-31949

---
From sbomify Insights: https://insights.sbomify.com/CVE-2024-31949/
Summaries are generated and may contain mistakes; the official description above is the record.