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.
74
Vulnerability1 · 1 read
CVE-2026-93864
Link-following file overwrite in WatchGuard Fireware OS
- CVSS 4.0
- 7.1 high
- EPSS
- —
- Published
- ·
- Modified
AI analysisSummaries by Vani AI
A link-following flaw in WatchGuard Fireware OS’s firewall daemon lets a local attacker who already has code execution as a low-privileged system process overwrite arbitrary files as root and tamper with firewall IP set data. The attacker plants a crafted file-system object and triggers a list update. Written content is only partially constrained. Fireware OS systems are affected; affected builds are not stated.
What to do: Apply WatchGuard’s update for CVE-2026-93864. 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
A link following vulnerability in WatchGuard Fireware OS’s firewall daemon allows a local attacker with code execution as a low-privileged system process to overwrite arbitrary files with root privileges, and to tamper with firewall IP set data, by planting a crafted file system object and triggering a list update. Written content is partially constrained.
- Weakness
- CWE-22, CWE-59, CWE-73, CWE-377
- Vector
- CVSS:4.0/AV:L/AC:L/AT:P/PR:L/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