CVE-2024-6594Public exploitNetwork attack vector

Service crash via argumentless logon command

Published Sep 25, 2024 · Updated Aug 7, 2026

Denial of service in WatchGuard Single Sign-On Client 12.0 through 12.7 allows remote attackers to crash the Windows service. The unauthenticated TCP 4116 command handler terminates the service when it receives a logon command without the required username argument. Network access to the client is required; repeated commands interrupt SSO and can revoke affected workstations' network privileges.

CVSS severity8.7
High
EPSS probability0.63%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Denial of service in WatchGuard Single Sign-On Client 12.0 through 12.7 allows remote attackers to crash the Windows service. The unauthenticated TCP 4116 command handler terminates the service when it receives a logon command without the required username argument. Network access to the client is required; repeated commands interrupt SSO and can revoke affected workstations' network privileges.

The record

CVE
CVE-2024-6594
Published
Sep 25, 2024
Updated
Aug 7, 2026
Vendor
WatchGuard Technologies
Product
WatchGuard Single Sign-On Client
Classifications
CWE-755, CAPEC-227, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 25, 2024CVE publishedPublication date reported by the CVE source.
  2. Aug 7, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <=12.7

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

WatchGuard Technologies · WatchGuard Single Sign-On Clientversion=0 <=12.7
WatchGuard Technologies · WatchGuard Active Directory SSO Clientversion=12.0 <=12.7

Published CVSS scores

7.5WatchGuard TechnologiesCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
8.7WatchGuard TechnologiesCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-755Improper Handling of Exceptional Conditions
CAPEC-227Sustained Client Engagement
T1499.004Application or System Exploitation

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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