CVE-2025-9242
Published: November 12, 2025
Official Description
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.
CISA KEV Advisory
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.
Risk Analysis
This vulnerability in WatchGuard Firebox allows a remote attacker to execute arbitrary code due to an out-of-bounds write in the OS iked process. With an EPSS score of 0.61609 and confirmed exploitation in the wild, this is a critical risk that requires immediate attention.
Active exploitation of this vulnerability has been observed in the wild, and it is listed in CISA's KEV catalog. The flaw is remotely exploitable without authentication.
Apply the latest security updates or patches provided by WatchGuard for Firebox devices. Ensure network segmentation and access controls are in place to limit exposure.
Technical Analysis
CVE-2025-9242 requires local access, meaning attackers must already have a foothold on the target system.
Exploitation requires some privileges, which limits the exposure to scenarios where an attacker has already gained initial access.
CISA has added CVE-2025-9242 to the Known Exploited Vulnerabilities (KEV) catalog, confirming active exploitation in the wild. U.S. federal agencies are required to patch this within the mandated timeframe, and all organizations should treat remediation as urgent.
Exploit & PoC Resources
All References (2)
Quick Facts
Recommended Actions
- →Apply vendor patches immediately
- →Monitor CVE-2025-9242 in threat intel feeds
- →Review IDS/IPS signatures for exploitation attempts
- !CISA KEV: Federal agencies must patch per BOD 22-01 timeline
- !Active exploitation confirmed — treat as P1