CVE-2026-81433CWE-120CWE-121CWE-787

CVE-2026-81433

published September 30, 2026

CVSS
8.7
EPSS
0%
Percentile
9.3
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS
8.7 · NONE
CVSS v4.0
8.7 · CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
EPSS
0.00200 · 9.3th percentile
Weaknesses
CWE-120 · Buffer Copy without Checking Size of Input ('Classic Buffer Overflow'); CWE-121 · Stack-based Buffer Overflow; CWE-787 · Out-of-bounds Write
Published
2026-09-30T04:16Z
References (1)
https://psirt.watchguard.com/CVE-2026-81433 · 5d1c2695-1a31-4499-88ae-e847036fd7e3
EPSS history
Timeline
  • 01 OCT 03:49Z
    EPSS moved — → 0%
    epss
  • 29 SEP 23:05Z
    Fireware OS Pre-Authentication Stack Buffer Overflow in fingerd Allows Remote Code Execution
    cvelistv5