Out-of-bounds write in Fireware OS - CVE-2026-8247
Published: July 3, 2026
Vulnerability identifier: #VU136878
CSH Severity: High
CVSS v4.0: CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Amber
CVE-ID: CVE-2026-8247
CWE-ID: CWE-787
Exploitation vector: Adjecent network
Exploit availability:
No public exploit available
Vendor: WatchGuard
Affected software:
Fireware OS
Fireware OS
Detailed vulnerability description
The vulnerability allows a remote attacker to execute arbitrary code.
The vulnerability exists due to out-of-bounds write in the admd component when handling adjacent network requests. A remote attacker can send a specially crafted request to execute arbitrary code.
How to mitigate CVE-2026-8247
Install security update from vendor's website.