CVE-2026-103594 WatchGuard Fireware OS - Buffer Overflow

WatchGuard Fireware OS contains a stack-based buffer overflow caused by improper WireGuard configuration processing, letting remote attackers with man-in-the-middle TLS-decrypted access cause denial of service or execute arbitrary code, exploit requires MITM TLS-decrypted access.

CVSS base score 9.5 /10
Critical
CISA KEV
Not listed
Public exploit
None known
EPSS
0.43% chance of exploitation in 30 days
View the NVD record ↗

Details

Type
Buffer Overflow
Impact
Remote Code Execution, Denial Of Service
CVSS vector
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H/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
Published
27 October 2026
Updated
29 October 2026
Weakness
CWE-121

Vendor fix

Update to the latest Fireware OS version.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

References

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