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-2026-103593
Stack buffer overflow in Fireware OS logging service
- CVSS 4.0
- 7.1 high
- EPSS
- —
- Published
- ·
- Modified
AI analysisSummaries by Vani AI
A stack-based buffer overflow in the Fireware OS logging service is triggered when a network-adjacent attacker impersonates or intercepts traffic to the configured log server and presents a specially crafted certificate. No privileges or user interaction are required. Successful exploitation runs arbitrary code as root. Affected builds and a fixed release are not stated.
What to do: No fixed version or workaround is stated. Apply the vendor update for CVE-2026-103593 if one is published.
| Product | Affected |
|---|---|
| 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
A stack-based buffer overflow vulnerability in the Fireware OS logging service allows a network-adjacent attacker who can impersonate or intercept traffic to the configured log server to execute arbitrary code with root privileges by presenting a specially crafted certificate.
- Weakness
- CWE-121, CWE-787
- Vector
- CVSS:4.0/AV:L/AC:L/AT:P/PR:N/UI:N/VC:N/VI:H/VA:H/SC:N/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