CVE-2025-9242

WatchGuard Firebox remote code execution, confirmed exploited in the wild.

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.

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92%chance of exploitation in the next 30 days (EPSS), 99th percentile

12 Novadded to CISA's Known Exploited Vulnerabilities list, 2025

3 Decfederal remediation deadline, already passed

Passedpast the deadline: patch now

CISA's name for it	WatchGuard Firebox Out-of-Bounds Write Vulnerability
Vendor and product	WatchGuard · Firebox
Type	remote code execution · CWE-787
Exploited	Confirmed by CISA listed 12 November 2025
Likelihood	one of the most likely to be exploited of every vulnerability tracked
Deadline	3 December 2025 · already passed
Used in ransomware	Not reported
Advisories	www.watchguard.com ↗ · nvd.nist.gov ↗

What to do

Three steps, in this order

Step 1

Patch to the fixed version the vendor names, today if the product faces the internet.

Step 2

Until it is patched, take the affected service off the internet or put it behind a VPN or allow-list.

Step 3

Look for signs it was already used: new accounts, web shells, unexpected processes and outbound connections since the date it was listed.

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.

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Questions

CVE-2025-9242 in short

Is CVE-2025-9242 being exploited?

Yes. CISA added CVE-2025-9242 to its Known Exploited Vulnerabilities catalogue on 12 November 2025, which it does only on evidence of exploitation in the wild.

What is the CISA deadline for CVE-2025-9242?

US federal agencies must remediate it by 3 December 2025. Everyone else should treat that date as the latest safe point to patch an internet-facing system.

How likely is CVE-2025-9242 to be exploited in the next 30 days?

FIRST's Exploit Prediction Scoring System gives it 92%, the 99th percentile of every CVE it scores.

How do I fix CVE-2025-9242?

Patch to the fixed version the vendor names, today if the product faces the internet. Until it is patched, take the affected service off the internet or put it behind a VPN or allow-list. Look for signs it was already used: new accounts, web shells, unexpected processes and outbound connections since the date it was listed.

Same vendor

Other WatchGuard vulnerabilities being exploited

CVE	Product	Type	Listed
CVE-2025-14733	Firebox	remote code execution	19 December 2025

Sources: CISA Known Exploited Vulnerabilities catalogue (released 10 November 2026) and FIRST EPSS. Page compiled automatically by SAK T.L.M, the threat-intelligence tool of SAK T.E.C, on 13 November 2026.