# CVE-2026-20334: Other in Cisco Secure Firewall Adaptive Security Appliance (ASA) Software

> Cisco released a hardening update addressing multiple coding standard violations in firewall software, requiring users to apply the patch for improved security posture.

- **Severity:** High 8.4 (`CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:H/I:H/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** An administrator
- **Attackable:** Over the internet
- **Victim action needed:** A user has to click or open something
- **Fix available:** No
- **Published:** 16 Sep 2026
- **Updated:** 18 Sep 2026
- **Also known as:** GHSA-2vf5-qc6p-8g6v

## What is CVE-2026-20334?

CVE-2026-20334 is a high-severity vulnerability in Cisco Secure Firewall Adaptive Security Appliance (ASA) Software, published on 16 Sep 2026. An attacker needs administrator access to exploit it, and only if a user opens a file or follows a link.

### Official description

As part of Cisco's ongoing commitment to proactive security and product quality, the Cisco Secure Adaptive Security Appliance Software, Cisco Secure Firewall Threat Defense Software and Cisco Secure Firewall Management Center Software engineering team has conducted a comprehensive internal security review. This review resulted in a software hardening release that addresses multiple internally discovered vulnerabilities.

The vulnerabilities tracked by CVE-2026-20334 are related to issues concerning improper adherence to coding standards that are grouped under the Common Weakness Enumeration (CWE) Pillar CWE-710.

Weakness: CWE-710 (Improper Adherence to Coding Standards)

## Which versions are affected by CVE-2026-20334?


## How do I fix CVE-2026-20334?

No fix has been published for CVE-2026-20334 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-20334 being exploited?

There is no known exploitation of CVE-2026-20334 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-20334 and fix it if it is affected.

What it is: CVE-2026-20334 is a high-severity vulnerability in Cisco Secure Firewall Adaptive Security Appliance (ASA) Software, published on 16 Sep 2026. An attacker needs administrator access to exploit it, and only if a user opens a file or follows a link.
Exploitation: There is no known exploitation of CVE-2026-20334 in the wild and no public exploit code.

Affected product: Cisco Secure Firewall Adaptive Security Appliance (ASA) Software. 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-2026-20334/ (Markdown: https://insights.sbomify.com/CVE-2026-20334/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-20334
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-20334
- OSV: https://osv.dev/vulnerability/CVE-2026-20334

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-20334/
Summaries are generated and may contain mistakes; the official description above is the record.