# CVE-2025-20359: Multiple Cisco Products Snort 3 MIME Information Disclosure or Denial of Service Vulnerability

> Remote attackers can trigger a buffer under-read in Snort 3, causing sensitive data disclosure or denial of service via crafted HTTP packets.

- **Severity:** Medium 6.5 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:L`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 15 Oct 2025
- **Updated:** 12 Feb 2026
- **Also known as:** GHSA-wcv6-8jqc-wfcx

## What is CVE-2025-20359?

CVE-2025-20359 is a medium-severity vulnerability in Cisco Cyber Vision, published on 15 Oct 2025. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

Multiple Cisco products are affected by a vulnerability in the Snort 3 HTTP Decoder that could allow an unauthenticated, remote attacker to cause the disclosure of possible sensitive data or cause the Snort 3 Detection Engine to crash.

This vulnerability is due to an error in the logic of buffer handling when the MIME fields of the HTTP header are parsed. This can result in a buffer under-read. An attacker could exploit this vulnerability by sending crafted HTTP packets through an established connection that is parsed by Snort 3. A successful exploit could allow the attacker to induce one of two possible outcomes: the unexpected restarting of the Snort 3 Detection Engine, which could cause a denial of service (DoS) condition, or information disclosure of sensitive information in the Snort 3 data stream. Due to the under-read condition, it is possible that sensitive information that is not valid connection data could be returned.

Weakness: CWE-127 (Buffer Under-read)

## Which versions are affected by CVE-2025-20359?

It affects 1 product.


Products: Cisco Snort.

## How do I fix CVE-2025-20359?

No fix has been published for CVE-2025-20359 yet. Limit exposure of the affected software until one is available.

## Is CVE-2025-20359 being exploited?

There is no known exploitation of CVE-2025-20359 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2025-20359 and fix it if it is affected.

What it is: CVE-2025-20359 is a medium-severity vulnerability in Cisco Cyber Vision, published on 15 Oct 2025. 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-2025-20359 in the wild and no public exploit code.

Affected product: Cisco Cyber Vision. 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-2025-20359/ (Markdown: https://insights.sbomify.com/CVE-2025-20359/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2025-20359
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2025-20359
- OSV: https://osv.dev/vulnerability/CVE-2025-20359

---
From sbomify Insights: https://insights.sbomify.com/CVE-2025-20359/
Summaries are generated and may contain mistakes; the official description above is the record.