# CVE-2024-31951: Memory corruption in n/a

> A buffer overflow in the FRRouting OSPF LSA parser allows remote attackers to crash the daemon via malformed Segment Routing Adjacency SID subTLVs.

- **Severity:** Medium 6.5 (`CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Local or same network only
- **Victim action needed:** Not needed
- **Fix available:** Yes
- **Published:** 7 Apr 2024
- **Updated:** 4 Nov 2024
- **Also known as:** AZL-39815, DEBIAN-CVE-2024-31951, GHSA-h4c3-x7vv-8q28, UBUNTU-CVE-2024-31951

## What is CVE-2024-31951?

CVE-2024-31951 is a medium-severity memory corruption vulnerability in n/a, published on 7 Apr 2024. It can only be exploited from the same machine or local network, with no action from the victim.

### Official description

In the Opaque LSA Extended Link parser in FRRouting (FRR) through 9.1, there can be a buffer overflow and daemon crash in ospf_te_parse_ext_link for OSPF LSA packets during an attempt to read Segment Routing Adjacency SID subTLVs (lengths are not validated).

Weakness: CWE-120 (Buffer Copy without Checking Size of Input)

## Which versions are affected by CVE-2024-31951?

It affects 1 product.


Products: Frrouting Frrouting.

## How do I fix CVE-2024-31951?

Apply the vendor's patch.

## Is CVE-2024-31951 being exploited?

There is no known exploitation of CVE-2024-31951 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-2024-31951 and fix it if it is affected.

What it is: CVE-2024-31951 is a medium-severity memory corruption vulnerability in n/a, published on 7 Apr 2024. It can only be exploited from the same machine or local network, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2024-31951 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-2024-31951/ (Markdown: https://insights.sbomify.com/CVE-2024-31951/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2024-31951
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2024-31951
- OSV: https://osv.dev/vulnerability/CVE-2024-31951

---
From sbomify Insights: https://insights.sbomify.com/CVE-2024-31951/
Summaries are generated and may contain mistakes; the official description above is the record.