# CVE-2025-20263: Memory corruption in Cisco Adaptive Security Appliance (ASA) Software

> Unauthenticated remote attackers can cause a denial of service via buffer overflow in Cisco ASA and FTD web services.

- **Severity:** High 8.6 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 14 Aug 2025
- **Updated:** 14 Aug 2025
- **Also known as:** GHSA-8qmf-r775-gfcm

## What is CVE-2025-20263?

CVE-2025-20263 is a high-severity memory corruption vulnerability in Cisco Adaptive Security Appliance (ASA) Software, published on 14 Aug 2025. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

A vulnerability in the web services interface of Cisco Secure Firewall Adaptive Security Appliance (ASA) Software and Cisco Secure Firewall Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to cause a buffer overflow on an affected system. 

This vulnerability is due to insufficient boundary checks for specific data that is provided to the web services interface of an affected system. An attacker could exploit this vulnerability by sending a crafted HTTP request to the affected system. A successful exploit could allow the attacker to cause a buffer overflow condition on the affected system, which could cause the system to reload, resulting in a denial of service (DoS) condition.

Weakness: CWE-680 (Integer Overflow to Buffer Overflow)

## Which versions are affected by CVE-2025-20263?


## How do I fix CVE-2025-20263?

No fix has been published for CVE-2025-20263 yet. Limit exposure of the affected software until one is available.

## Is CVE-2025-20263 being exploited?

There is no known exploitation of CVE-2025-20263 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2025-20263 and fix it if it is affected.

What it is: CVE-2025-20263 is a high-severity memory corruption vulnerability in Cisco Adaptive Security Appliance (ASA) Software, published on 14 Aug 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-2025-20263 in the wild and no public exploit code.

Affected product: Cisco 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-2025-20263/ (Markdown: https://insights.sbomify.com/CVE-2025-20263/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2025-20263
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2025-20263
- OSV: https://osv.dev/vulnerability/CVE-2025-20263

---
From sbomify Insights: https://insights.sbomify.com/CVE-2025-20263/
Summaries are generated and may contain mistakes; the official description above is the record.