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Known exploited vulnerability

CVE-2025-9242

criticalCVSS 4.0 9.3In CISA KEVEPSS 92%Published · WatchGuard

The short answer

CVE-2025-9242 affects WatchGuard Fireware OS and is rated critical (CVSS 9.3). CISA added it to the Known Exploited Vulnerabilities catalog on 2025-11-12: attackers are using it, so patch it first.

What it is

An Out-of-bounds Write vulnerability in the WatchGuard Fireware OS iked process 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. If the Firebox was previously configured with the mobile user VPN with IKEv2 or a branch office VPN using IKEv2 to a dynamic gateway peer, and both of those configurations have since been deleted, that Firebox may still be vulnerable if a branch office VPN to a static gateway peer is still configured.

Weakness: CWE-787.

Severity

9.3 critical

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

Exploited (CISA KEV)

Yes, since Nov 12, 2025

Federal due date Dec 3, 2025

EPSS, next 30 days

92%

Higher than 100% of scored CVEs

How it can be exploited

Attack vector
Network
Attack complexity
Low
Attack requirements
None
Privileges required
None
User interaction
None
Confidentiality impact
High
Integrity impact
High
Availability impact
High

What CISA says to do

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

Affected products

Fireware OS. NVD's record lists the exact affected versions.

References

Questions

Is CVE-2025-9242 being exploited?

Yes. CISA added CVE-2025-9242 to its Known Exploited Vulnerabilities catalog on 2025-11-12, with a federal remediation due date of 2025-12-03.

How do I fix CVE-2025-9242?

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

From NVD, CISA KEV, FIRST EPSS and OSV.dev, checked . Status on NVD: Analyzed. The description is NVD's text, quoted as published.

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