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CVE-2025-9242

9.8, critical Known exploited

WatchGuard Firebox Out-of-Bounds Write Vulnerability

NVD (opens in a new tab) CVE.org (opens in a new tab) CISA KEV catalogue (opens in a new tab)
CVSS
9.8, critical critical CVSS v3.1
EPSS, next 30 days
92% higher than 99.8% of scored CVEs
Exploitation
Confirmed in the wild
Published
17 Sept 2025a year ago

Known exploited

CISA added this to the Known Exploited Vulnerabilities Catalog on 12 Nov 2025. US federal agencies had to remediate by 3 Dec 2025, a deadline that has passed.

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.

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.

Details

Vendor
WatchGuard
Product
Fireware OS
Weakness
CWE-787 (opens in a new tab)
Status
Analyzed
Updated
10 Aug 2026
Assigner
5d1c2695-1a31-4499-88ae-e847036fd7e3

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

References 4

Exploit code 1

Advisories 1

Other references 2

The kind is read from NVD's tags where present and from the shape of the URL otherwise, so treat it as a hint.

Other WatchGuard CVEs

Every WatchGuard CVE we hold

Same vendor in what we hold, not a known link between the flaws.

  • CVE-2025-14733 WatchGuard Firebox Out of Bounds Write Vulnerability KEV EPSS 27% 9.8, critical
  • CVE-2022-26318 WatchGuard Firebox and XTM Appliances Arbitrary Code Execution KEV EPSS 78% 9.8, critical
  • CVE-2022-23176 WatchGuard Firebox and XTM Privilege Escalation Vulnerability KEV EPSS 11% 8.8, high
  • CVE-2026-86131 WatchGuard Fireware OS Code Injection Vulnerability EPSS 0.4% 9.8, critical
  • CVE-2026-13046 WatchGuard Fireware OS Deserialization of Untrusted Data Vulnerability EPSS 0.4% 7.2, high
  • CVE-2026-18145 WatchGuard Fireware OS Stack-based Buffer Overflow Vulnerability EPSS 0.4% 7.2, high
  • CVE-2026-86104 WatchGuard Fireware OS Uncontrolled Resource Consumption Vulnerability EPSS 0.4% 7.5, high
  • CVE-2026-86105 WatchGuard Fireware OS Path Traversal Vulnerability EPSS 0.3% 7.1, high

Beyond this page

Is CVE-2025-9242 in your network?

This page tells you how dangerous CVE-2025-9242 is out there. Whether it sits on one of your devices, only a scan of your own network can tell. That is what our systems do, every day, for the companies we protect.

CVE-2025-9242 is in the CISA catalogue of exploited vulnerabilities: attackers are already exploiting it.

  • EXYS7600 OCELOT

    Find it before attackers do

    Ocelot scans your network on a schedule and reports every vulnerability it finds by its CVE identifier, with its CVSS score and how many of your hosts are affected. A finding like CVE-2025-9242 comes with the devices to patch.

    Learn more about EXYS7600 OCELOT

  • EXYS7950 KONDRA

    Detect it if it's exploited

    Until the patch is applied, Kondra monitors your network, events and endpoints in real time. It keeps an inventory of the software installed on every endpoint, and its anomaly detection rules flag what an attacker does once inside.

    Learn more about EXYS7950 KONDRA
Check your exposure

Assembled from the NVD 2.0 API, the CISA Known Exploited Vulnerabilities Catalog and FIRST EPSS. Scores are as of our last collection on 16 Oct 2026, not the live upstream state.