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CVE-2026-78009

Fireware OS Out-of-Bounds Read in iked Allows Unauthenticated Denial of Service (DoS)

HIGH
8.7
CVSS Score
Published: August 27, 2026 at 11:24 PM UTC
Updated: September 3, 2026 at 09:17 PM UTC
1 product affected across 1 vendorFireware

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Severity
HIGH8.7
Exploit prediction
EPSS 0.5%
SSVC
No known exploit

Description

An out-of-bounds read vulnerability in the WatchGuard Fireware OS iked process allows a remote unauthenticated attacker to create a Denial of Service (DoS) condition in VPN processing by sending specially crafted network traffic.

Affected

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

Fireware· WatchGuard
60%
12.0 ≤ v < 12.12.212.0 ≤ v < 12.5.202025.0 ≤ v < 2026.2.22026.3 ≤ v < 2026.3.112.02025.02026.3
Affected range stops below 12.12.2, so it looks safe — our inference, not a vendor statement
Affected range stops below 12.5.20, so it looks safe — our inference, not a vendor statement
Affected range stops below 2026.2.2, so it looks safe — our inference, not a vendor statement
Affected range stops below 2026.3.1, 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-2026-78009

SSVC — Action Prioritization

SSVCNo known exploitAutomatablePartial impact

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

CVSS

8.7HIGHWatchGuard
Vector?

Quick Info

StatusDEFERRED
CWE
CWE-125CWE-20

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