CVE-2024-6594

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

Published Sep 25, 2024 CVSS 4.0 · 8.7 High EPSS < 1% KEV · Not listed
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.

Remediation

Vendor Workaround

An attacker must have already established network access to exploit this vulnerability. WatchGuard recommends using Windows Firewall rules to restrict TCP port 4116 network access to the Single Sign-On Client to only allow connections from the Authentication Gateway (SSO Agent). Windows administrators can use Group Policy objects to add Windows firewall rules to their endpoints.

Tracking

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Advisories

Source ID Title
EUVD EUVD EUVD-2024-47659 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. This issue affects Single Sign-On Client: through 12.7.
History
Type Values Removed Values Added
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. This issue affects Single Sign-On Client: through 12.7. 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.
First Time appeared Watchguard sso Client
CPEs cpe:2.3:a:watchguard:sso_client:*:*:*:*:*:*:*:*
Vendors & Products Watchguard sso Client
References
Metrics cvssV4_0

{'score': 8.7, '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'}

Type Values Removed Values Added
Metrics epss

{'score': 0.00424}

epss

{'score': 0.00464}

Type Values Removed Values Added
CPEs cpe:2.3:a:watchguard:single_sign-on_client:*:*:*:*:*:*:*:* cpe:2.3:a:watchguard:single_sign-on_client:*:*:*:*:*:windows:*:*
Type Values Removed Values Added
First Time appeared Watchguard
Watchguard single Sign-on Client
CPEs cpe:2.3:a:watchguard:single_sign-on_client:*:*:*:*:*:*:*:*
Vendors & Products Watchguard
Watchguard single Sign-on Client
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Type Values Removed Values Added
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. This issue affects Single Sign-On Client: through 12.7.
Title WatchGuard Firebox Single Sign-On Client Denial-of-Service
Weaknesses CWE-755
References
Metrics cvssV3_1

{'score': 7.5, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
WatchGuard
Published
Updated
Aug 7, 2026, 11:42 PM
Reserved
Jul 9, 2024, 2:09 AM
Status
Modified
Published
Sep 25, 2024, 12:15 PM
Modified
Aug 8, 2026, 12:16 AM