High [CVE-2026-93864] Fireware OS Link Following in firewalld Allows Local Arbitrary File Overwrite as Root
This high-severity WatchGuard advisory covers CVE-2026-93864 affecting Fireware OS.
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Summary
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.
- Fireware OS 2025.1 before 2026.4
- Fireware OS 12.0 before 12.12.4
- Fireware OS 12.0 before 12.5.22
Official advisory · high-confidence parse· fetched 2 days ago·verify at source
- 2026.4
- 12.12.4
- 12.5.22
Official advisory · high-confidence parse· fetched 2 days ago·verify at source
Mitigation checklist
- 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.
Official advisory · high-confidence parse· fetched 2 days ago·verify at source
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- CVE-2026-112709Oct 27, 2026Fireware OS Heap Buffer Overflow in AD Authentication Service Allows Pre-Authentication
- CVE-2026-90464Oct 27, 2026external control of file path vulnerability in a WatchGuard Fireware OS firewall
- CVE-2026-103593Oct 27, 2026Fireware OS Stack Buffer Overflow in Logging Service Allows Remote Code Execution
- CVE-2026-113881Oct 27, 2026Fireware OS Stack Buffer Overflow in VPN Network Access Enforcement Allows Unprivileged
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