# CVE-2022-40318: Denial of service in n/a

> Attackers can cause a denial of service in FRRouting's BGP daemon by sending a crafted BGP OPEN message, leading to assertion failures or out-of-bounds reads.

- **Severity:** Medium 6.5 (`CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** Yes
- **Published:** 3 May 2023
- **Updated:** 3 Aug 2024
- **Also known as:** DEBIAN-CVE-2022-40318, GHSA-9rqq-99cf-35g5

## What is CVE-2022-40318?

CVE-2022-40318 is a medium-severity denial of service vulnerability in Debian Debian Linux, published on 3 May 2023. Any signed-in user can exploit it over the network, with no action from the victim.

### Official description

An issue was discovered in bgpd in FRRouting (FRR) through 8.4. By crafting a BGP OPEN message with an option of type 0xff (Extended Length from RFC 9072), attackers may cause a denial of service (assertion failure and daemon restart, or out-of-bounds read). This is possible because of inconsistent boundary checks that do not account for reading 3 bytes (instead of 2) in this 0xff case. NOTE: this behavior occurs in bgp_open_option_parse in the bgp_open.c file, a different location (with a different attack vector) relative to CVE-2022-40302.

Weakness: CWE-125 (Out-of-bounds Read)

## Which versions are affected by CVE-2022-40318?

It affects 2 products.


Products: Debian Debian Linux, Frrouting Frrouting.

## How do I fix CVE-2022-40318?

Apply the vendor's patch.

## Is CVE-2022-40318 being exploited?

There is no known exploitation of CVE-2022-40318 in the wild and no public exploit code.

## Other vulnerabilities in Debian Debian Linux

- [CVE-2015-3306](https://insights.sbomify.com/CVE-2015-3306/): ProFTPD Improper Access Control (critical 10.0, exploited in the wild)
- [CVE-2025-49113](https://insights.sbomify.com/CVE-2025-49113/): RoundCube Webmail Deserialization of Untrusted Data (critical 9.9, exploited in the wild)
- [CVE-2026-24061](https://insights.sbomify.com/CVE-2026-24061/): GNU InetUtils Argument Injection (critical 9.8, exploited in the wild)
- [CVE-2025-39682](https://insights.sbomify.com/CVE-2025-39682/): Linux Kernel Improper Check for Unusual or Exceptional Conditions (critical 9.8, exploited in the wild)
- [CVE-2024-9680](https://insights.sbomify.com/CVE-2024-9680/): Mozilla Firefox Use-After-Free (critical 9.8, exploited in the wild)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2022-40318 and fix it if it is affected.

What it is: CVE-2022-40318 is a medium-severity denial of service vulnerability in Debian Debian Linux, published on 3 May 2023. Any signed-in user can exploit it over the network, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2022-40318 in the wild and no public exploit code.

Affected product: Debian Debian Linux. 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-2022-40318/ (Markdown: https://insights.sbomify.com/CVE-2022-40318/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2022-40318
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2022-40318
- OSV: https://osv.dev/vulnerability/CVE-2022-40318

---
From sbomify Insights: https://insights.sbomify.com/CVE-2022-40318/
Summaries are generated and may contain mistakes; the official description above is the record.