# CVE-2025-54858: BIG-IP Advanced WAF and ASM vulnerability

> Attackers can cause a denial of service by sending specific requests to a BIG-IP virtual server configured with a malformed JSON schema in a WAF or ASM policy.

- **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:N`)
- **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-g256-87j3-gw89

## What is CVE-2025-54858?

CVE-2025-54858 is a high-severity denial of service vulnerability in F5 Big-Ip Advanced Web Application Firewall, 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 a BIG-IP Advanced WAF or BIG-IP ASM Security Policy is configured with a JSON content profile that has a malformed JSON schema, and the security policy is applied to a virtual server, undisclosed requests can cause the bd process to terminate.

 Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated.

Weakness: CWE-674 (Uncontrolled Recursion)

## Which versions are affected by CVE-2025-54858?

It affects 2 products.


Products: F5 Big-Ip Advanced Web Application Firewall, F5 Big-Ip Application Security Manager.

## How do I fix CVE-2025-54858?

No fix has been published for CVE-2025-54858 yet. Limit exposure of the affected software until one is available.

## Is CVE-2025-54858 being exploited?

There is no known exploitation of CVE-2025-54858 in the wild and no public exploit code.

## Other vulnerabilities in F5 Big-Ip Advanced Web Application Firewall

- [CVE-2021-23031](https://insights.sbomify.com/CVE-2021-23031/): Privilege escalation in BIG-IP Advanced WAF and BIG-IP ASM (critical 9.9)
- [CVE-2021-23029](https://insights.sbomify.com/CVE-2021-23029/): Server-side request forgery in BIG-IP Advanced WAF and BIG-IP ASM (high 8.8)
- [CVE-2021-23014](https://insights.sbomify.com/CVE-2021-23014/): Missing authorization in BIG-IP ASM/Advanced WAF (high 8.8)
- [CVE-2021-22993](https://insights.sbomify.com/CVE-2021-22993/): Cross-site scripting in BIG-IP Advanced WAF and BIG-IP ASM (high 8.8)
- [CVE-2026-40060](https://insights.sbomify.com/CVE-2026-40060/): BIG-IP Advanced WAF and ASM vulnerability (high 8.7)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2025-54858 and fix it if it is affected.

What it is: CVE-2025-54858 is a high-severity denial of service vulnerability in F5 Big-Ip Advanced Web Application Firewall, 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-2025-54858 in the wild and no public exploit code.

Affected product: F5 Big-Ip Advanced Web Application Firewall. 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-2025-54858/ (Markdown: https://insights.sbomify.com/CVE-2025-54858/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2025-54858
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2025-54858
- OSV: https://osv.dev/vulnerability/CVE-2025-54858

---
From sbomify Insights: https://insights.sbomify.com/CVE-2025-54858/
Summaries are generated and may contain mistakes; the official description above is the record.