CVE-2025-9242

Name: CVE-2025-9242
Creator: NVD / NIST
Published: 2025-09-17T08:15:33.96+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

CRITICALCVSS 9.3/10Actively ExploitedEPSS 86.37%

Last modified Jun 17, 2026

CVE-2025-9242 is a critical-severity vulnerability rated 9.3/10 on the CVSS scale. 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.. CISA has confirmed active exploitation in the wild. EPSS estimates a 86.37% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

9.8/10

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

CVSS 4.0

9.3/10

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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

EPSS Probability

86.37%

99.7th percentile

Probability of exploitation in the next 30 days. Learn more

Exploitation Status

This vulnerability is listed in CISA’s Known Exploited Vulnerabilities catalog, confirming active exploitation in the wild. Federal agencies must remediate by Dec 3, 2025.

Weakness Enumeration

CWE-787

Affected Software

Vendor	Product	Versions
Watchguard	Fireware	>= 11.10.2, < 12.11.4
Watchguard	Fireware	>= 11.10.2, < 12.5.13
Watchguard	Fireware	2025.1

References

Timeline

Published: Sep 17, 2025
Last Modified: Jun 17, 2026
Status: Analyzed

Frequently Asked Questions

What is CVE-2025-9242?

How severe is CVE-2025-9242?

CVE-2025-9242 has a CVSS score of 9.3/10 (CRITICAL severity). The EPSS model estimates a 86.37% probability of exploitation in the next 30 days. This vulnerability is listed in CISA's Known Exploited Vulnerabilities catalog.

How do I fix CVE-2025-9242?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2025-9242?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST