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CVE-2026-81851

Fireware OS Heap-Based Buffer Overflow in iked Allows Denial of Service

MEDIUM
6.9
CVSS Score
Published: August 27, 2026 at 10:58 PM UTC
Updated: August 28, 2026 at 08:20 PM UTC
1 product affected across 1 vendorFireware

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Severity
MEDIUM6.9
Exploit prediction
EPSS 0.4%
SSVC
No known exploit

Description

A heap-based buffer overflow vulnerability in Fireware OS's iked process allows an authenticated administrator to crash the IKE daemon (iked), resulting in a denial of service, by saving a specially crafted configuration.

Affected

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

Fireware· WatchGuard
60%
12.0 ≤ v < 12.11.912.0 ≤ v < 12.12.112.0 ≤ v < 12.5.182025.0 ≤ v < 2026.2.112.02025.0
Affected range stops below 12.11.9, so it looks safe — our inference, not a vendor statement
Affected range stops below 12.12.1, so it looks safe — our inference, not a vendor statement
Affected range stops below 12.5.18, so it looks safe — our inference, not a vendor statement
Affected range stops below 2026.2.1, 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 Advisory
Source: cverecord
https://psirt.watchguard.com/CVE-2026-81851

SSVC — Action Prioritization

SSVCNo known exploitNot automatablePartial impact

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

CVSS

6.9MEDIUMWatchGuard
Vector?

Quick Info

StatusDEFERRED
CWE
CWE-122CWE-1284

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