CVE-2026-86133 WatchGuard Fireware OS - Denial of Service

WatchGuard Fireware OS IKE daemon contains an integer underflow vulnerability caused by processing specially crafted encrypted IKEv2 messages, letting remote attackers crash the iked process after completing initial IKEv2 handshake, exploit requires completed initial handshake.

CVSS base score 7.5 /10
High
CISA KEV
Not listed
Public exploit
None known
Authentication
Not required
EPSS
0.35% chance of exploitation in 30 days
View the NVD record ↗

Details

Type
Denial of Service
Impact
Denial Of Service
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Published
30 September 2026
Updated
15 October 2026
Weakness
CWE-191

Vendor fix

Update to the latest version of WatchGuard Fireware OS.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

References

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