WatchGuard Firebox Single Sign-On Client Denial-of-Service
Priority MEDIUM 45CWE-755Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Attack requirements
- None
- Impact type
- —
- Confidentiality · integrity · availability
- None · None · High
- Fix status
- No fix listed
Attack profile from CVSS 4.0 · CNA. Fix status from CNA.
Summary
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.
Why it matters now
Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00639 50th percentileScored 2026-11-07
Fix No fix listed No fixed version in the sources yet
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- Yes
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| WatchGuard | SSO Client | 12.0 – 12.7 | — | No fix listed | CNA |
- SSO Client VendorWatchGuard Affected 12.0 – 12.7 Fixed in — No fix listed CNA
CPE configurations NVD · 1
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:watchguard:single_sign-on_client:*:*:*:*:*:windows:*:* | up to 12.7 | Vulnerable | WatchGuard |
- cpe:2.3:a:watchguard:single_sign-on_client:*:*:*:*:*:windows:*:* Versions up to 12.7 Vulnerable ·WatchGuard
Remediation
No fixed version listed by the sources yet.
Timeline
- 2026-10-02 Threatist record created from CVE-2024-6594
- 2026-10-03 Alias added: GHSA-4h99-x2cv-q42q
- 2026-10-24 EPSS moved to the 50th–90th percentile
References
More WatchGuard Single Sign-on Client vulnerabilities
- TI-2024-06114 WatchGuard Firebox Single Sign-On Agent Protocol Authorization Bypass CVSS 4.0CRITICAL 9.3
Sources
- CVE-2024-6594 · CVE Program
- CVE-2024-6594 · NVD
- FIRST EPSS
- GHSA-4h99-x2cv-q42q · GitHub Advisory Database · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences