CVE-2026-81433 Details
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.
A stack-based buffer overflow vulnerability has been identified in the DHCP fingerprinting daemon (fingerd) of WatchGuard Fireware OS. This vulnerability allows an unauthenticated attacker with adjacent network access to execute arbitrary code or crash the process by sending a specially crafted DHCP packet.
Users can upgrade to Fireware OS versions 2026.3.2, 2026.2.3, or 12.12.3 to address this vulnerability.
Metrics
CVSS 4.0 Severity and Vector Strings:
VolerionCVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
Volerion
Assessed Sep 30, 2026CISA-ADP
Assessed Sep 30, 2026References to Advisories, Solutions, and Tools
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| URL | Source(s) | Tag(s) |
|---|---|---|
| https://psirt.watchguard.com/CVE-2026-81433 | WatchGuard Technologies, Inc. | AdvisoryRemedyVendor |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-120 | Buffer Copy without Checking Size of Input ('Classic Buffer Overflow') | WatchGuard Technologies, Inc. |
| CWE-121 | Stack-based Buffer Overflow | WatchGuard Technologies, Inc. |
| CWE-787 | Out-of-bounds Write | WatchGuard Technologies, Inc. |
Affected Products
| Product | Versions |
|---|---|
| WatchGuard Fireware OS | >= 2026.3, < 2026.3.2 >= 2025.0, < 2026.2.3 >= 12.0, < 12.12.3 |
CPE
Remediation
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Change History
3 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Oct 1, 2026 | CVE Modified | CISA-ADP |
| Sep 30, 2026 | CVE Modified | CISA-ADP |
| Sep 30, 2026 | New CVE Received | WatchGuard Technologies, Inc. |