# CVE-2019-6637: Denial of service in BIG-IP (ASM)

> Authenticated users can trigger excessive memory consumption via ASM REST endpoints, causing system instability and process termination.

- **Severity:** Medium 6.5 (`CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 3 Jul 2019
- **Updated:** 4 Aug 2024
- **Also known as:** GHSA-g336-28q4-56hj

## What is CVE-2019-6637?

CVE-2019-6637 is a medium-severity denial of service vulnerability in F5 Big-Ip Application Security Manager, published on 3 Jul 2019. Any signed-in user can exploit it over the network, with no action from the victim.

### Official description

On BIG-IP (ASM) 14.1.0-14.1.0.5, 14.0.0-14.0.0.4, 13.0.0-13.1.1.4, and 12.1.0-12.1.4, Application logic abuse of ASM REST endpoints can lead to instability of BIG-IP system. Exploitation of this issue causes excessive memory consumption which results in the Linux kernel triggering OOM killer on arbitrary processes. The attack requires an authenticated user with role of "Guest" or greater privilege. Note: "No Access" cannot login so technically it's a role but a user with this access role cannot perform the attack.

## Which versions are affected by CVE-2019-6637?

It affects 1 product.


Products: F5 Big-Ip Application Security Manager.

## How do I fix CVE-2019-6637?

No fix has been published for CVE-2019-6637 yet. Limit exposure of the affected software until one is available.

## Is CVE-2019-6637 being exploited?

There is no known exploitation of CVE-2019-6637 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-2025-55669](https://insights.sbomify.com/CVE-2025-55669/): BIG-IP HTTP/2 vulnerability (high 8.7)
- [CVE-2009-4420](https://insights.sbomify.com/CVE-2009-4420/): Memory corruption in n/a (high 7.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2019-6637 and fix it if it is affected.

What it is: CVE-2019-6637 is a medium-severity denial of service vulnerability in F5 Big-Ip Application Security Manager, published on 3 Jul 2019. Any signed-in user can exploit it over the network, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2019-6637 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-2019-6637/ (Markdown: https://insights.sbomify.com/CVE-2019-6637/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2019-6637
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2019-6637
- OSV: https://osv.dev/vulnerability/CVE-2019-6637

---
From sbomify Insights: https://insights.sbomify.com/CVE-2019-6637/
Summaries are generated and may contain mistakes; the official description above is the record.