# CVE-2025-20222: Cisco Adaptive Security Appliance Software and Firepower Threat Defense Software Buffer Vulnerability

> Unauthenticated remote attackers can cause a device reload and denial of service by sending crafted IPv6 packets over an IPsec VPN connection.

- **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-qwrq-hc6q-9r7j

## What is CVE-2025-20222?

CVE-2025-20222 is a high-severity denial of service vulnerability in Cisco Firepower Threat Defense 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 RADIUS proxy feature for the IPsec VPN feature 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 denial of service (DoS) condition.

This vulnerability is due to improper processing of IPv6 packets. An attacker could exploit this vulnerability by sending IPv6 packets over an IPsec VPN connection to an affected device. A successful exploit could allow the attacker to trigger a reload of the device, resulting in a DoS condition.

Weakness: CWE-120 (Buffer Copy without Checking Size of Input)

## Which versions are affected by CVE-2025-20222?


## How do I fix CVE-2025-20222?

No fix has been published for CVE-2025-20222 yet. Limit exposure of the affected software until one is available.

## Is CVE-2025-20222 being exploited?

There is no known exploitation of CVE-2025-20222 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2025-20222 and fix it if it is affected.

What it is: CVE-2025-20222 is a high-severity denial of service vulnerability in Cisco Firepower Threat Defense 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-2025-20222 in the wild and no public exploit code.

Affected product: Cisco Firepower Threat Defense 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-2025-20222/ (Markdown: https://insights.sbomify.com/CVE-2025-20222/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2025-20222
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2025-20222
- OSV: https://osv.dev/vulnerability/CVE-2025-20222

---
From sbomify Insights: https://insights.sbomify.com/CVE-2025-20222/
Summaries are generated and may contain mistakes; the official description above is the record.