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Tool Directory

CVE-2024-6594

HighPublished

WatchGuard Firebox Single Sign-On Client Denial-of-Service

Published: Sep 25, 2024
Updated: Aug 7, 2026
Assigning CNA: WatchGuard
Evidence observed: Aug 8, 2026

Primary CVSS

8.7/ 10High

nvd · CVSS 4.0

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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

EPSS probability estimate

0.6%

Low · next 30 days

Percentile: 48.7%
Model date: Sep 21, 2026

EPSS is a statistical estimate, not a certainty or a measure of impact. Combine it with CVSS, KEV status, exposure and your environment.

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.

Sources

watchguard-sso-clientPoC
Client Implementation for the WatchGuard SSO Agent Protocol used for Security Research (CVE-2024-6592, CVE-2024-6593, CVE-2024-6594)

Responsible use

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