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CVE-2026-81433

Fireware OS Pre-Authentication Stack Buffer Overflow in fingerd Allows Remote Code Execution

HIGH
8.7
CVSS Score
Published: September 29, 2026 at 11:05 PM UTC
Updated: October 1, 2026 at 04:18 AM UTC
1 product affected across 1 vendorFireware

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Severity
HIGH8.7
Exploit prediction
EPSS 0.2%
SSVC
No known exploit

Description

A stack-based buffer overflow vulnerability in WatchGuard Fireware OS's DHCP fingerprinting daemon (fingerd) allows an unauthenticated attacker with adjacent network access to execute arbitrary code or crash the process by sending a specially crafted DHCP packet.

Affected

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

Fireware· WatchGuard
60%
12.0 ≤ 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 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 Advisory
Source: cverecord
https://psirt.watchguard.com/CVE-2026-81433

SSVC — Action Prioritization

SSVCNo known exploitNot automatableTotal impact

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

CVSS

8.7HIGHWatchGuard
Vector?

Quick Info

StatusDEFERRED
CWE
CWE-120CWE-121CWE-787

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