Latest WatchGuard Firebox vulnerability #

WatchGuard has disclosed that certain versions of its Fireware OS are affected by an out-of-bounds write vulnerability in IKED, the Internet Key Exchange (IKE) daemon that facilitates the establishment of IPsec VPN tunnels. This vulnerability may allow a remote, unauthenticated adversary to execute arbitrary code on the system. The vulnerability affects both the mobile user VPN with IKEv2 and the branch office VPN (BOVPN) with IKEv2 when configured with a dynamic gateway peer. A Firebox that was previously configured with either a mobile user VPN with IKEv2 or a BOVPN with IKEv2 to a dynamic gateway peer may still be vulnerable, even if those configurations have since been deleted, if it is still configured with a BOVPN to a static gateway peer. This vulnerability has been designated CVE-2025-9242 and has been rated critical with a CVSS score of 9.3.

The following models are affected

  • Firebox models with Fireware OS 12.5.x: T15, and T35
  • Firebox models with Fireware OS 12.x: T20, T25, T40, T45, T55, T70, T80, T85, M270, M290, M370, M390, M470, M570, M590, M670, M690, M440, M4600, M4800, M5600, M5800, Firebox Cloud, Firebox NV5, and FireboxV
  • Firebox models with Fireware OS 2025.1.x: T115-W, T125, T125-W, T145, T145-W, and T185

The following versions are affected

  • Fireware OS version 11.10.2 through 11.12.4_Update1
  • Fireware OS version 12.0 through 12.11.3
  • Fireware OS version 2025.1

What is the impact? #

Successful exploitation of these vulnerabilities would allow an adversary to execute arbitrary code on the vulnerable host, potentially leading to complete system compromise.

Are updates or workarounds available? #

Users are encouraged to update to the latest version as quickly as possible:

  • Fireware OS 11.x end-of-life (EOL) versions upgrade to a supported version
  • Fireware OS 12.x upgrade to version 12.11.4 or later
  • Fireware OS 12.3.1 (FIPS-certified release) upgrade to version 12.3.1_Update3 (B722811) or later
  • Fireware OS 12.5.x (Firebox T15 & T35) upgrade to version 12.5.13 or later
  • Fireware OS 2025.1 upgrade to version 2025.1.1 or later

    How to find potentially vulnerable systems with runZero #

    From the Asset Inventory, use the following query to locate potentially vulnerable assets:

    os:="WatchGuard Fireware"

    Written by Matthew Kienow

    Matthew Kienow is a software engineer and security researcher. Matthew previously worked on the Recog recognition framework, AttackerKB as well as Metasploit's MSF 5 APIs. He has also designed, built, and successfully deployed many secure software solutions; however, often he enjoys breaking them instead. He has presented his research at various security conferences including DerbyCon, Hack In Paris, and CarolinaCon. His research has been cited by CSO, Threatpost and SC Magazine.

    More about Matthew Kienow
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