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CVE-2026-104381VulnerabilityPublished

Fireware OS's FireCluster state synchronization feature · Missing Authentication Vulnerability

Source GCVE Database

0
Authoritative record:CVE-2026-104381· Medium 6.0

Not known to be exploited · CVSS 6.0 Medium : upgrade to 2026.4 or 12.12.4 when convenient.

Data as of 27 Oct 2026, 20:14 UTC

CVSS 4.0 base score
6.0Medium
How severe the flaw is on the 0–10 CVSS scale.
Patch
Available – fixed in 2026.4, 12.12.4, 12.5.22
CVSS:4.0/AV:A/AC:L/AT:P/PR:N/UI:N/VC:N/VI:L/VA:H/SC:N/SI:N/SA:N

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 27 Oct 2026

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponised: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq Mirage: no evidence on record.

    No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 26 Oct 2026.

What to do

Upgrade Fireware to 2026.4 or 12.12.4 (OS); 12.5.22 (OS).

Affected software

ProductAffectedFixed in
WatchGuardFireware OSAffected
  • >=2025.1 <2026.4
Fixed in
  • 2026.4
WatchGuardFireware OSAffected
  • >=12.0 <12.12.4
Fixed in
  • 12.12.4
WatchGuardFireware OSAffected
  • >=12.0 <12.5.22
Fixed in
  • 12.5.22

AI-suggested

If you cannot patch yet, restrict access to the cluster synchronization network segment to trusted devices only to reduce the risk of exploitation.

Description

A vulnerability in Fireware OS's FireCluster state synchronization feature allows an unauthenticated attacker on the cluster synchronization network segment to prematurely terminate VPN tunnels by sending crafted synchronization traffic.

References

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