Is CVE-2025-9242 in the CISA KEV catalog?

Yes. CVE-2025-9242 is on the CISA Known Exploited Vulnerabilities list, added 2025-11-12.

What is the CVSS severity of CVE-2025-9242?

CVE-2025-9242 has a CVSS v3 base score of 9.8 (CRITICAL).

What is the EPSS score for CVE-2025-9242?

CVE-2025-9242 has an EPSS score of 86.37% (100th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2025-9242?

Upgrade fireware to 12.5.13 or later.

CVE & CISA-KEV Catalog

CVE-2025-9242

CRITICALCISA KEVEPSS 100th pctl

9.8

CVSS v3

NVD

Description

An Out-of-bounds Write vulnerability in WatchGuard Fireware OS may allow a remote unauthenticated attacker to execute arbitrary code. This vulnerability affects both the Mobile User VPN with IKEv2 and the Branch Office VPN using IKEv2 when configured with a dynamic gateway peer.This vulnerability affects Fireware OS 11.10.2 up to and including 11.12.4_Update1, 12.0 up to and including 12.11.3 and 2025.1.

CWE-787Out-of-bounds Write

How to fix

Remediation Available

firewareNVD

Affected:>= 11.10.2, < 12.5.13Fixed in:12.5.13CVE-2025-9242derived from NVD

TridentStack Control can deploy fixes like this automatically across your Windows, macOS, and Linux fleet. See how it works

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredNone

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityHigh

IntegrityHigh

AvailabilityHigh

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Exploit Intelligence

86.37%probability of exploitation in 30 days

100thpercentile

Very high risk: more likely to be exploited than 100% of all known CVEs.

Known Exploited Vulnerability (CISA KEV)

WatchGuard Firebox Out-of-Bounds Write Vulnerability

WatchGuard Firebox contains an out-of-bounds write vulnerability in the OS iked process that may allow a remote unauthenticated attacker to execute arbitrary code.

Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.

Remediation due: 2025-12-03

References

Exploit1

github.com

Vendor Advisory1

watchguard.com

Government Resource1

cisa.gov

Related Vulnerabilities

Other CWE-787 (Out-of-bounds Write) vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2025-22457	Critical	9.0	100%	KEV + Ransom	Fix
CVE-2025-0282	Critical	9.0	100%	KEV + Ransom	-
CVE-2015-3113	Critical	9.8	100%	KEV	Fix
CVE-2021-20038	Critical	9.8	100%	KEV + Ransom	-
CVE-2023-4863	High	8.8	100%	KEV	Fix
CVE-2020-16040	Medium	6.5	100%	-	Fix

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2025-11-14.