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
Published
Updated
Check this codebase for CVE-2023-38406 and fix it if it is affected.
What it is: CVE-2023-38406 is a critical vulnerability in n/a, published on 6 Nov 2023.
Exploitation: There is no known exploitation of CVE-2023-38406 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-2023-38406/ (Markdown: https://insights.sbomify.com/CVE-2023-38406/index.md)
- Exploited in the wild
- Not known
- Fix
- Available
What is CVE-2023-38406?
CVE-2023-38406 is a critical vulnerability in n/a, published on 6 Nov 2023.
Official description
bgpd/bgp_flowspec.c in FRRouting (FRR) before 8.4.3 mishandles an nlri length of zero, aka a "flowspec overflow."
Weakness: CWE-755
Which versions are affected by CVE-2023-38406?
It affects 1 product.
Products include Frrouting Frrouting.
How do I fix CVE-2023-38406?
Upgrade to a fixed version.
Is CVE-2023-38406 being exploited?
There is no known exploitation of CVE-2023-38406 in the wild and no public exploit code.
Other vulnerabilities in n/a
Sources
Also known as CLSA-2025-1762181946, DEBIAN-CVE-2023-38406, GHSA-8jp5-89m5-6xp3, UBUNTU-CVE-2023-38406.