# CVE-2020-17468: Denial of service in n/a

> An out-of-bounds read in the IPv6 extension header processing allows attackers to cause a denial of service in applications using the FNET library.

- **Severity:** High 7.5 (`CVSS:3.1/AV:N/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:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 11 Dec 2020
- **Updated:** 4 Aug 2024
- **Also known as:** GHSA-r324-2rx8-5ggw

## What is CVE-2020-17468?

CVE-2020-17468 is a high-severity denial of service vulnerability in n/a, published on 11 Dec 2020. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

An issue was discovered in FNET through 4.6.4. The code for processing the hop-by-hop header (in the IPv6 extension headers) doesn't check for a valid length of an extension header, and therefore an out-of-bounds read can occur in _fnet_ip6_ext_header_handler_options in fnet_ip6.c, leading to Denial-of-Service.

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

## Which versions are affected by CVE-2020-17468?

It affects 1 product.


Products: Butok Fnet.

## How do I fix CVE-2020-17468?

No fix has been published for CVE-2020-17468 yet. Limit exposure of the affected software until one is available.

## Is CVE-2020-17468 being exploited?

There is no known exploitation of CVE-2020-17468 in the wild and no public exploit code.

## Other vulnerabilities in n/a

- [CVE-2020-27633](https://insights.sbomify.com/CVE-2020-27633/): Weak cryptography in n/a (critical 9.1)
- [CVE-2020-17467](https://insights.sbomify.com/CVE-2020-17467/): Information disclosure in n/a (critical 9.1)
- [CVE-2020-24383](https://insights.sbomify.com/CVE-2020-24383/): Information disclosure in n/a (critical 9.1)
- [CVE-2020-17469](https://insights.sbomify.com/CVE-2020-17469/): Null dereference in n/a (high 7.5)
- [CVE-2020-17470](https://insights.sbomify.com/CVE-2020-17470/): Weak cryptography in n/a (medium 5.3)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2020-17468 and fix it if it is affected.

What it is: CVE-2020-17468 is a high-severity denial of service vulnerability in n/a, published on 11 Dec 2020. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2020-17468 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-2020-17468/ (Markdown: https://insights.sbomify.com/CVE-2020-17468/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2020-17468
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2020-17468
- OSV: https://osv.dev/vulnerability/CVE-2020-17468

---
From sbomify Insights: https://insights.sbomify.com/CVE-2020-17468/
Summaries are generated and may contain mistakes; the official description above is the record.