# CVE-2025-55669: BIG-IP HTTP/2 vulnerability

> Attackers can cause a denial of service by sending undisclosed traffic to BIG-IP systems with specific WAF and HTTP/2 configurations.

- **Severity:** High 8.7 (`CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA: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:** 26 Feb 2026
- **Also known as:** GHSA-5r25-m2h9-w299

## What is CVE-2025-55669?

CVE-2025-55669 is a high-severity denial of service vulnerability in F5 Big-Ip Application Security Manager, published on 15 Oct 2025. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

When the BIG-IP Advanced WAF and ASM security policy and a server-side HTTP/2 profile are configured on a virtual server, undisclosed traffic can cause the Traffic Management Microkernel (TMM) to terminate.  Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated.

Weakness: CWE-672 (Operation on a Resource after Expiration or Release)

## Which versions are affected by CVE-2025-55669?

It affects 1 product.


Products: F5 Big-Ip Application Security Manager.

## How do I fix CVE-2025-55669?

No fix has been published for CVE-2025-55669 yet. Limit exposure of the affected software until one is available.

## Is CVE-2025-55669 being exploited?

There is no known exploitation of CVE-2025-55669 in the wild and no public exploit code.

## Other vulnerabilities in F5 Big-Ip Application Security Manager

- [CVE-2019-6665](https://insights.sbomify.com/CVE-2019-6665/): Other in BIG-IP ASM (critical 9.4)
- [CVE-2019-6650](https://insights.sbomify.com/CVE-2019-6650/): Information disclosure in BIG-IP ASM (critical 9.1)
- [CVE-2025-24326](https://insights.sbomify.com/CVE-2025-24326/): BIG-IP Advanced WAF/ASM BADoS vulnerability (high 8.9)
- [CVE-2009-4420](https://insights.sbomify.com/CVE-2009-4420/): Memory corruption in n/a (high 7.8)
- [CVE-2021-23010](https://insights.sbomify.com/CVE-2021-23010/): Denial of service in BIG-IP ASM/Advanced WAF (high 7.5)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2025-55669 and fix it if it is affected.

What it is: CVE-2025-55669 is a high-severity denial of service vulnerability in F5 Big-Ip Application Security Manager, 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-2025-55669 in the wild and no public exploit code.

Affected product: F5 Big-Ip Application Security Manager. 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-2025-55669/ (Markdown: https://insights.sbomify.com/CVE-2025-55669/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2025-55669
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2025-55669
- OSV: https://osv.dev/vulnerability/CVE-2025-55669

---
From sbomify Insights: https://insights.sbomify.com/CVE-2025-55669/
Summaries are generated and may contain mistakes; the official description above is the record.