High
Fireware OS Pre-Authentication Stack Buffer Overflow in fingerd Allows Remote Code Execution
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.
Announced Group revision 1
Original source ↗CVE-2026-81433
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: cve:CVE-2026-81433
Fireware OS
Source reference: /containers/cna/affected/0/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"vendor": "WatchGuard",
"product": "Fireware OS",
"versions": [
{
"status": "affected",
"version": "2026.3",
"lessThan": "2026.3.2",
"versionType": "custom"
},
{
"status": "affected",
"version": "2025.0",
"lessThan": "2026.2.3",
"versionType": "custom"
},
{
"status": "affected",
"version": "12.0",
"lessThan": "12.12.3",
"versionType": "custom"
}
],
"platforms": [
"Default"
],
"defaultStatus": "unaffected"
}
]- Related CVEs
- CVE-2026-81433
Source reference:
/cveMetadata/cveId
Publisher severity
high
Source reference: /containers/cna/metrics
- Event
- #5066 · Revision 1
- Added to Heist Feed
- Publisher date