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CVE-2025-9242

WatchGuard Firebox iked Out of Bounds Write Vulnerability

  • Critical 9.3
  • Exploited: added to CISA KEV 12 Nov 2025

Description

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.

Key facts

Published
17 Sep 2025
Last changed
10 Aug 2026
Assigned by
WatchGuard
KEV added
12 Nov 2025
KEV fix due
3 Dec 2025
EPSS
92.219% likely to be exploited in the next 30 days, higher than 99.825% of CVEs (scores for 15 Nov 2026)
SSVC (CISA)
Exploitation: active; Automatable: yes; Technical impact: total

Severity scores

Each score is shown as its source gave it. They are not averaged or merged.

  • 9.3CVSS 4.0, Criticalfrom the CNA (WatchGuard)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

What to do

  • Fireware OS 2025.1.1, Fireware OS 12.11.4, Fireware OS 12.5.13, Fireware OS 12.3.1+722811CNA solution statement
  • If your Firebox is only configured with Branch Office VPN tunnels to static gateway peers and you are not able to immediately upgrade the device to a version of Fireware OS with the vulnerability resolution, you can follow WatchGuard’s recommendations for Secure Access to Branch Office VPNs that Use IPSec and IKEv2 as a temporary workaround.CNA workaround statement
  • Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.CISA KEV required action

Historical context and remediation

This reference retains the original CVE publication date. A recent record update does not mean a new attack occurred.

No separately sourced impact summary is available on this page yet. Consult the description, version data and dated exploitation evidence.

Version statuses below come from the CNA. An “unaffected” version is not necessarily a currently supported release or proof of a patch date. EPSS is a dated risk estimate, not a count of historical attacks.

Read the original CVE record.

Affected products

VendorProductVersions
WatchGuardFireware OS
  • Default status: unaffected
  • 11.0 up to and including 11.12.4+541730 (affected)
  • 12.0 up to but excluding 12.11.4 (affected)
  • 2025.0 up to but excluding 2025.1.1 (affected)
WatchGuardFireware OS
  • Default status: unaffected
  • 12.0 up to but excluding 12.3.1+722811 (affected)
WatchGuardFireware OS
  • Default status: unaffected
  • 12.0 up to but excluding 12.5.13 (affected)

Timeline

  1. 17 Sep 2025 Published
  2. 21 Oct 2025 Updated to provide Indicators of Attack and additional remediation guidance due to potential active exploits in the wild.
  3. 7 Nov 2025 Updated to correct an error in the logging level required for the IDi payload size IOA.
  4. 12 Nov 2025 CVE-2025-9242 added to CISA KEV
  5. 12 Nov 2025 Added to the CISA KEV catalogue
  6. 1 Dec 2025 Updated the IKE Process Hang Indicator of Attack with new information regarding tunnel traffic availabiltiy.

Weakness

References