CVE-2026-93862

Fireware OS Out-of-Bounds Read in FireCluster Sync Allows Denial of Service

Published Oct 27, 2026 CVSS 4.0 · 7.2 High EPSS < 1% KEV · Not listed
Description
An out-of-bounds read vulnerability in the FireCluster Sync processing allows an attacker positioned on the cluster interconnect, such as a compromised cluster peer or an on-path network attacker, to repeatedly crash the firewall's cluster synchronization process by sending specially crafted network traffic, resulting in a sustained denial of service.

Remediation

Vendor Solution

Fireware OS 2026.4, Fireware OS 12.12.4, Fireware OS 12.5.22

Tracking

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Advisories

No advisories available
History
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Type Values Removed Values Added
Description An out-of-bounds read vulnerability in the FireCluster Sync processing allows an attacker positioned on the cluster interconnect, such as a compromised cluster peer or an on-path network attacker, to repeatedly crash the firewall's cluster synchronization process by sending specially crafted network traffic, resulting in a sustained denial of service.
Title Fireware OS Out-of-Bounds Read in FireCluster Sync Allows Denial of Service
First Time appeared Watchguard
Watchguard fireware Os
Weaknesses CWE-125
CWE-129
CWE-787
CWE-823
CPEs cpe:2.3:a:watchguard:fireware_os:*:*:*:*:*:*:*:*
Vendors & Products Watchguard
Watchguard fireware Os
References
Metrics cvssV4_0

{'score': 7.2, 'vector': 'CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:H/SC:N/SI:N/SA:N'}

Sources

Status
PUBLISHED
Assigner
WatchGuard
Published
Updated
Oct 29, 2026, 1:52 AM
Reserved
Sep 18, 2026, 7:17 PM
Status
Awaiting Analysis
Published
Oct 27, 2026, 4:17 PM
Modified
Oct 29, 2026, 2:16 AM