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CVE-2025-9242

WatchGuard Firebox Out-of-Bounds Write

9.8 CRITICALActively exploited (CISA KEV)Public exploitEPSS 91.3%
  1. Published17 Sept 2025
  2. Added to CISA KEV12 Nov 2025
  3. Remediation due3 Dec 2025
Actively exploited (CISA KEV)

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.

Added to KEV: 12 Nov 2025Federal remediation due: 3 Dec 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.

CVSS 3.1 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredNone
User interactionNone
ScopeUnchanged
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected products

Watchguard Fireware≥ 11.10.2 < 12.11.4 · ≥ 11.10.2 < 12.5.13 · 2025.1

Remediation

Fixed in
Watchguard Fireware≥ 12.11.4

References

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Frequently asked

Is CVE-2025-9242 being actively exploited?

Yes. CVE-2025-9242 is listed in the CISA Known Exploited Vulnerabilities (KEV) catalog, added 12 Nov 2025.

How severe is CVE-2025-9242?

CVE-2025-9242 has a CVSS 3.1 base score of 9.8, rated critical. EPSS estimates a 91.3% probability of exploitation.

Which products are affected by CVE-2025-9242?

Affected products include Watchguard Fireware.

How do I fix CVE-2025-9242?

Upgrade affected software to a fixed version, for example Watchguard Fireware 12.11.4 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2025-9242 against the real software inventory on every managed device, as each hourly inventory arrives. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. Because it is on the CISA KEV list, a risk for it never ranks below high, and the update that fixes it moves to the Emergency patch lane. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.