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CVE-2026-8247 Details

Description

An Out-of-bounds Write vulnerability in WatchGuard Fireware OS may allow an unauthenticated attacker on the same local network segment to execute arbitrary code. This vulnerability affects Fireware OS 11.0 up to and including 11.12.4_Update1, 12.0 up to and including 12.12 and 2025.1 up to and including 2026.2.

Metrics

CVSS 3.x Severity and Vector Strings:

NIST: [email protected]CVSS-B:8.8 HIGHVector:CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

References to Advisories, Solutions, and Tools

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URL	Source(s)	Tag(s)
https://psirt.watchguard.com/CVE-2026-8247	WatchGuard Technologies, Inc.	Broken Link
https://www.watchguard.com/wgrd-psirt/advisory/wgsa-2026-00026	WatchGuard Technologies, Inc.	Vendor Advisory

Weakness Enumeration

CWE-ID	CWE Name	Source
CWE-787	Out-of-bounds Write	[email protected]
CWE-120	Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')	WatchGuard Technologies, Inc.

Affected Products

Product	Versions
watchguard fireware	>= 11.0.0, < 11.12.4 11.12.4 - 11.12.4 u1 >= 12.5, < 12.5.19 >= 2025.1, < 2026.2.1
CPE cpe:2.3:o:watchguard:fireware:::::::: cpe:2.3:o:watchguard:fireware:11.12.4:-:::::: cpe:2.3:o:watchguard:fireware:11.12.4:u1:::::: Remediation No remediation found in references.
watchguard firebox t15	All versions
CPE cpe:2.3:h:watchguard:firebox_t15:-:::::::* Remediation No remediation found in references.
watchguard firebox t35	All versions
CPE cpe:2.3:h:watchguard:firebox_t35:-:::::::* Remediation No remediation found in references.
watchguard firebox m295	All versions
CPE cpe:2.3:h:watchguard:firebox_m295:-:::::::* Remediation No remediation found in references.
watchguard firebox m395	All versions
CPE cpe:2.3:h:watchguard:firebox_m395:-:::::::* Remediation No remediation found in references.
watchguard firebox m495	All versions
CPE cpe:2.3:h:watchguard:firebox_m495:-:::::::* Remediation No remediation found in references.
watchguard firebox m595	All versions
CPE cpe:2.3:h:watchguard:firebox_m595:-:::::::* Remediation No remediation found in references.
watchguard firebox m695	All versions
CPE cpe:2.3:h:watchguard:firebox_m695:-:::::::* Remediation No remediation found in references.
watchguard firebox t115-w	All versions
CPE cpe:2.3:h:watchguard:firebox_t115-w:-:::::::* Remediation No remediation found in references.
watchguard firebox t125	All versions
CPE cpe:2.3:h:watchguard:firebox_t125:-:::::::* Remediation No remediation found in references.
watchguard firebox t125-w	All versions
CPE cpe:2.3:h:watchguard:firebox_t125-w:-:::::::* Remediation No remediation found in references.
watchguard firebox t145	All versions
CPE cpe:2.3:h:watchguard:firebox_t145:-:::::::* Remediation No remediation found in references.
watchguard firebox t145-w	All versions
CPE cpe:2.3:h:watchguard:firebox_t145-w:-:::::::* Remediation No remediation found in references.
watchguard firebox t185	All versions
CPE cpe:2.3:h:watchguard:firebox_t185:-:::::::* Remediation No remediation found in references.
watchguard firebox cloud	All versions
CPE cpe:2.3:a:watchguard:firebox_cloud:-:::::::* Remediation No remediation found in references.
watchguard firebox m270	All versions
CPE cpe:2.3:h:watchguard:firebox_m270:-:::::::* Remediation No remediation found in references.
watchguard firebox m290	All versions
CPE cpe:2.3:h:watchguard:firebox_m290:-:::::::* Remediation No remediation found in references.
watchguard firebox m370	All versions
CPE cpe:2.3:h:watchguard:firebox_m370:-:::::::* Remediation No remediation found in references.
watchguard firebox m390	All versions
CPE cpe:2.3:h:watchguard:firebox_m390:-:::::::* Remediation No remediation found in references.
watchguard firebox m440	All versions
CPE cpe:2.3:h:watchguard:firebox_m440:-:::::::* Remediation No remediation found in references.
watchguard firebox m4600	All versions
CPE cpe:2.3:h:watchguard:firebox_m4600:-:::::::* Remediation No remediation found in references.
watchguard firebox m470	All versions
CPE cpe:2.3:h:watchguard:firebox_m470:-:::::::* Remediation No remediation found in references.
watchguard firebox m4800	All versions
CPE cpe:2.3:h:watchguard:firebox_m4800:-:::::::* Remediation No remediation found in references.
watchguard firebox m5600	All versions
CPE cpe:2.3:h:watchguard:firebox_m5600:-:::::::* Remediation No remediation found in references.
watchguard firebox m570	All versions
CPE cpe:2.3:h:watchguard:firebox_m570:-:::::::* Remediation No remediation found in references.
watchguard firebox m5800	All versions
CPE cpe:2.3:h:watchguard:firebox_m5800:-:::::::* Remediation No remediation found in references.
watchguard firebox m590	All versions
CPE cpe:2.3:h:watchguard:firebox_m590:-:::::::* Remediation No remediation found in references.
watchguard firebox m670	All versions
CPE cpe:2.3:h:watchguard:firebox_m670:-:::::::* Remediation No remediation found in references.
watchguard firebox m690	All versions
CPE cpe:2.3:h:watchguard:firebox_m690:-:::::::* Remediation No remediation found in references.
watchguard firebox nv5	All versions
CPE cpe:2.3:h:watchguard:firebox_nv5:-:::::::* Remediation No remediation found in references.
watchguard firebox t20	All versions
CPE cpe:2.3:h:watchguard:firebox_t20:-:::::::* Remediation No remediation found in references.
watchguard firebox t25	All versions
CPE cpe:2.3:h:watchguard:firebox_t25:-:::::::* Remediation No remediation found in references.
watchguard firebox t40	All versions
CPE cpe:2.3:h:watchguard:firebox_t40:-:::::::* Remediation No remediation found in references.
watchguard firebox t45	All versions
CPE cpe:2.3:h:watchguard:firebox_t45:-:::::::* Remediation No remediation found in references.
watchguard firebox t55	All versions
CPE cpe:2.3:h:watchguard:firebox_t55:-:::::::* Remediation No remediation found in references.
watchguard firebox t70	All versions
CPE cpe:2.3:h:watchguard:firebox_t70:-:::::::* Remediation No remediation found in references.
watchguard firebox t80	All versions
CPE cpe:2.3:h:watchguard:firebox_t80:-:::::::* Remediation No remediation found in references.
watchguard firebox t85	All versions
CPE cpe:2.3:h:watchguard:firebox_t85:-:::::::* Remediation No remediation found in references.
watchguard fireboxv	All versions
CPE cpe:2.3:h:watchguard:fireboxv:-:::::::* Remediation No remediation found in references.

Change History

7 change records found show changes

Date	Action	Recorded By
Aug 28, 2026	CVE Modified	WatchGuard Technologies, Inc.
Aug 14, 2026	Reanalysis	[email protected]
Aug 13, 2026	Initial Analysis	[email protected]
Aug 10, 2026	CVE Modified	WatchGuard Technologies, Inc.
Jul 7, 2026	CVE Modified	CISA-ADP
Jul 6, 2026	CVE Modified	CISA-ADP
Jul 3, 2026	New CVE Received	WatchGuard Technologies, Inc.

CVE-2026-8247 Details

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