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CVE-2025-9242: WatchGuard Firebox Out-of-Bounds Write Vulnerability

criticalknown exploitedpublic exploitCVE-2025-9242
Actively exploited. At least one CVE in this advisory is listed in the CISA Known Exploited Vulnerabilities catalog — exploitation has been observed in the wild. Treat remediation as urgent.
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.

CSIRTS triage

vendor: WatchGuardproduct: FireboxMemory corruption
What
An out-of-bounds write vulnerability may allow a remote unauthenticated attacker to execute arbitrary code.
Who is affected
Remote unauthenticated users targeting WatchGuard Firebox are affected.
Urgency
Remediation is critical as the vulnerability is actively exploited and can lead to arbitrary code execution.
Action
Update Firebox to the latest version.

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Details

Source
CISA Known Exploited Vulnerabilities (US · database · site)
Severity
critical
Published
2025-11-12
Exploitation
Observed in the wild (CISA KEV)

Original advisory: https://nvd.nist.gov/vuln/detail/CVE-2025-9242

Exploitation outlook

EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.

Referenced CVEs

CVECSIRTS overviewExternal
CVE-2025-9242coverage & exploitation statusNVD · CVE.org

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