# CVE-2022-25763: Improper input validation on HTTP/2 headers

> Attackers can exploit improper HTTP/2 header validation in Apache Traffic Server to perform request smuggling or cache poisoning attacks.

- **Severity:** Medium 6.8 (`CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** A user has to click or open something
- **Fix available:** Yes
- **Published:** 10 Aug 2022
- **Updated:** 20 Oct 2025
- **Also known as:** DEBIAN-CVE-2022-25763, GHSA-mp6g-w483-p43g, UBUNTU-CVE-2022-25763

## What is CVE-2022-25763?

CVE-2022-25763 is a medium-severity vulnerability in Apache Traffic Server, published on 10 Aug 2022. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.

### Official description

Improper Input Validation vulnerability in HTTP/2 request validation of Apache Traffic Server allows an attacker to create smuggle or cache poison attacks. This issue affects Apache Traffic Server 8.0.0 to 9.1.2.

Weakness: CWE-444 (Inconsistent Interpretation of HTTP Requests)

## Which versions are affected by CVE-2022-25763?

It affects 3 products.


Products: Apache Traffic Server, Debian Debian Linux, Fedoraproject Fedora.

## How do I fix CVE-2022-25763?

Upgrade to a fixed version.

## Is CVE-2022-25763 being exploited?

There is no known exploitation of CVE-2022-25763 in the wild and no public exploit code.

## Other vulnerabilities in Apache Traffic Server

- [CVE-2014-3525](https://insights.sbomify.com/CVE-2014-3525/): Other in n/a (critical 10.0)
- [CVE-2021-43082](https://insights.sbomify.com/CVE-2021-43082/): heap-buffer-overflow with stats-over-http plugin (critical 9.8)
- [CVE-2021-35474](https://insights.sbomify.com/CVE-2021-35474/): Dynamic stack buffer overflow in cachekey plugin (critical 9.8)
- [CVE-2019-17559](https://insights.sbomify.com/CVE-2019-17559/): Other in Apache Traffic Server (critical 9.8)
- [CVE-2019-17565](https://insights.sbomify.com/CVE-2019-17565/): Other in Apache Traffic Server (critical 9.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2022-25763 and fix it if it is affected.

What it is: CVE-2022-25763 is a medium-severity vulnerability in Apache Traffic Server, published on 10 Aug 2022. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Exploitation: There is no known exploitation of CVE-2022-25763 in the wild and no public exploit code.

Affected product: Apache Traffic Server. 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-2022-25763/ (Markdown: https://insights.sbomify.com/CVE-2022-25763/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2022-25763
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2022-25763
- OSV: https://osv.dev/vulnerability/CVE-2022-25763

---
From sbomify Insights: https://insights.sbomify.com/CVE-2022-25763/
Summaries are generated and may contain mistakes; the official description above is the record.