WatchGuard discloses seven critical Fireware OS flaws enabling remote code execution
Supplied data names Fireware OS 2026.4 and 12.12.4 as fixes; this report does not establish exploitation.
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Vulnerability1 · 1 read
CVE-2026-93866
Heap overflow in WatchGuard Fireware Access Portal WebSocket
- CVSS 4.0
- 9.2 critical
- EPSS
- —
- Published
- ·
- Modified
AI analysisSummaries by Vani AI
An integer overflow in WebSocket connection handling in WatchGuard Fireware OS Access Portal lets a remote, unauthenticated attacker write past a heap buffer with a crafted request. The Access Portal feature must be enabled. Impact is high on confidentiality, integrity, and availability of the device. WatchGuard has not listed affected builds.
What to do: Apply WatchGuard's update for CVE-2026-93866. No fixed version or workaround is stated.
| Product | Affected |
|---|---|
| WatchGuard Fireware OS | — |
Estimated exposure
No basis for an estimate.
Order-of-magnitude estimate by the model from install counts, market share and public scan data it knows; verify before quoting.
Description · NVD
An integer overflow vulnerability in the WebSocket connection handling used by WatchGuard Fireware OS's Access Portal allows a remote, unauthenticated attacker to write beyond the bounds of a heap buffer by sending a specially crafted request while the Access Portal feature is enabled.
- Weakness
- CWE-190, CWE-288, CWE-787
- Vector
- CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X