vulntracker.iovulntracker.io
© 2026 vulntracker.io

CVE-2026-86133

Fireware OS Pre-Authentication Integer Underflow in iked Allows Remote Denial of Service

HIGH
7.5
CVSS Score
Published: September 29, 2026 at 11:05 PM UTC
Updated: October 6, 2026 at 08:28 PM UTC
1 product affected across 1 vendorFireware

Using Fireware OS by WatchGuard?

Get instant alerts when new vulnerabilities affect Fireware OS - before attackers find them.

Real-time alertsTrack your software stackFree plan available
Start FreeSign In
Severity
HIGH7.5
Exploit prediction
EPSS 0.3%
SSVC
No known exploit

Description

An integer underflow vulnerability in the WatchGuard Fireware OS IKE daemon (iked) allows a remote attacker who has completed the initial IKEv2 handshake to crash the iked process by sending a specially crafted encrypted IKEv2 message, resulting in a denial of service.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Fireware· WatchGuard
95%
12.0 ≤ v < 12.12.312.0 ≤ v < 12.5.2112.12 ≤ v < 12.12.32025.0 ≤ v < 2026.2.32026.3 ≤ v < 2026.3.212.02025.02026.3
Affected range stops below 12.12.3, so it looks safe — our inference, not a vendor statement
Affected range stops below 12.5.21, so it looks safe — our inference, not a vendor statement
Affected range stops below 2026.2.3, so it looks safe — our inference, not a vendor statement
Affected range stops below 2026.3.2, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

References (1)

Vendor AdvisoryPatch
Source: cverecord
https://psirt.watchguard.com/CVE-2026-86133

SSVC — Action Prioritization

SSVCNo known exploitNot automatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

7.5HIGH[email protected]
Attack Vector
NETWORK
Complexity
LOW
Privileges
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
NONE
Availability
HIGH
Vector?

Quick Info

StatusANALYZED
CWE
CWE-1284CWE-191

Get alerted

Stop reading CVE feeds looking for your own stack

Track the products you run and VulnTracker tells you when a new CVE affects them — with what is known about fixing it, and nothing about the rest.

Create accountSign in
Free plan, no card