CVE record · CVE-2025-9242

WatchGuard Firebox iked Out of Bounds Write Vulnerability

CVSS 9.3 CriticalCriticalIn CISA KEVEPSS 0.92 · 99th percentile

Critical, because:

In CISA’s KEV catalogue since 12 Nov 2025: it is known to be exploited.
CVSS score 9.3: 9.0 or more.
CVSS score 9.3 (7.0 or more) and EPSS 0.92 (0.1 or more): a high score and a real chance of exploitation in the next 30 days.

Published by the CVE Program (CNA: WatchGuard) at 17 Sept 2025, 07:29 UTC. agentprime has not analysed this yet, so whether it affects any app is not known. This CVE names a vendor and product rather than a package, so the lockfile check doesn’t match it.

Affected products, as the CNA wrote them
Vendor	Product	Versions
WatchGuard	Fireware OS	affected 11.0 to 11.12.4+541730, inclusive custom affected 12.0 to before 12.11.4 custom affected 2025.0 to before 2025.1.1 custom Other versions: unaffected
WatchGuard	Fireware OS	affected 12.0 to before 12.3.1+722811 custom Other versions: unaffected
WatchGuard	Fireware OS	affected 12.0 to before 12.5.13 custom Other versions: unaffected

Identifiers: CVE-2025-9242
CNA: WatchGuard
Weakness (CWE): CWE-787
Tags: WatchGuard Fireware OS
Memory corruption
Published: 17 Sept 2025
Updated: 10 Aug 2026

Not analysed yet

We haven’t published our own analysis of this CVE. If a person reviews it, this page will say what’s affected and what has to be true for it to matter.

Severity and exploitation

Score	Rating	CVSS	Vector	Source
9.3	Critical	4.0	CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N	CNA (WatchGuard)

CISA KEV Listed since 12 Nov 2025: known to be exploited.
EPSS 0.92, the 99th percentile, on 5 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

This record came from the full history of the CVE Program, published 17 Sept 2025. New records show when each source confirmed them.

Sources

References from the CNA

psirt.watchguard.com/CVE-2025-9242 vendor-advisory
www.watchguard.com/wgrd-psirt/advisory/wgsa-2025-00015 vendor-advisory

Facts on this page come from the CVE List as the CNA published them, with CVSS from the sources named above, CISA KEV and FIRST EPSS. Vendors, products and versions are shown as the CNA wrote them. We don’t reproduce the CVE’s description.