# CVE-2018-15326: Security feature bypass in BIG-IP (APM)

> Attackers can bypass certificate revocation checks in BIG-IP APM when CRL downloads fail, allowing revoked certificates to be treated as valid.

- **Severity:** High 7.5 (`CVSS:3.0/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/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:** 31 Oct 2018
- **Updated:** 5 Aug 2024
- **Also known as:** GHSA-9mcj-x8ch-2c4c

## What is CVE-2018-15326?

CVE-2018-15326 is a high-severity vulnerability in F5 Big-Ip Access Policy Manager, published on 31 Oct 2018. Any signed-in user can exploit it over the network, with no action from the victim.

### Official description

In some situations on BIG-IP APM 14.0.0-14.0.0.2, 13.0.0-13.1.0.7, 12.1.0-12.1.3.5, or 11.6.0-11.6.3.2, the CRLDP Auth access policy agent may treat revoked certificates as valid when the BIG-IP APM system fails to download a new Certificate Revocation List.

Weakness: CWE-295 (Improper Certificate Validation)

## Which versions are affected by CVE-2018-15326?

It affects 1 product.


Products: F5 Big-Ip Access Policy Manager.

## How do I fix CVE-2018-15326?

No fix has been published for CVE-2018-15326 yet. Limit exposure of the affected software until one is available.

## Is CVE-2018-15326 being exploited?

There is no known exploitation of CVE-2018-15326 in the wild and no public exploit code.

## Other vulnerabilities in F5 Big-Ip Access Policy Manager

- [CVE-2023-46747](https://insights.sbomify.com/CVE-2023-46747/): F5 BIG-IP Configuration Utility Authentication Bypass (critical 9.8, exploited in the wild)
- [CVE-2022-1388](https://insights.sbomify.com/CVE-2022-1388/): F5 BIG-IP Missing Authentication (critical 9.8, exploited in the wild)
- [CVE-2021-22986](https://insights.sbomify.com/CVE-2021-22986/): F5 BIG-IP and BIG-IQ Centralized Management iControl REST Remote Code Execution (critical 9.8, exploited in the wild)
- [CVE-2021-22991](https://insights.sbomify.com/CVE-2021-22991/): F5 BIG-IP Traffic Management Microkernel Buffer Overflow (critical 9.8, exploited in the wild)
- [CVE-2020-5902](https://insights.sbomify.com/CVE-2020-5902/): F5 BIG-IP Traffic Management User Interface (TMUI) Remote Code Execution (critical 9.8, exploited in the wild)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2018-15326 and fix it if it is affected.

What it is: CVE-2018-15326 is a high-severity vulnerability in F5 Big-Ip Access Policy Manager, published on 31 Oct 2018. Any signed-in user can exploit it over the network, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2018-15326 in the wild and no public exploit code.

Affected product: F5 Big-Ip Access Policy 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-2018-15326/ (Markdown: https://insights.sbomify.com/CVE-2018-15326/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2018-15326
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2018-15326
- OSV: https://osv.dev/vulnerability/CVE-2018-15326

---
From sbomify Insights: https://insights.sbomify.com/CVE-2018-15326/
Summaries are generated and may contain mistakes; the official description above is the record.