How severe is CVE-2025-9242?

CVE-2025-9242 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2025-9242 being actively exploited?

Yes. CVE-2025-9242 is on CISA's Known Exploited Vulnerabilities (KEV) catalog, added on 2025-11-12, which means active exploitation has been confirmed. It should be prioritised for remediation.

What products are affected by CVE-2025-9242?

CVE-2025-9242 primarily affects Watchguard Fireware. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2025-9242?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Because this CVE is known to be actively exploited, treat remediation as urgent — CISA KEV typically sets a short remediation deadline.

Does CVE-2025-9242 have an EU (EUVD) identifier?

Yes. CVE-2025-9242 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-29699. It is also flagged as exploited in the EUVD (since 2025-11-12).

When was CVE-2025-9242 published?

CVE-2025-9242 was published on 2025-09-17 and last updated on 2026-06-17.

CVE-2025-9242

CVE-2025-9242 is a critical-severity vulnerability in Watchguard Fireware with a CVSS 3.x base score of 9.8. It is listed in CISA's Known Exploited Vulnerabilities (KEV) catalog, confirming it has been exploited in the wild (added 2025-11-12). The underlying weakness is classified as CWE-787.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
CVSS v4: 9.3
EPSS exploit prediction: 86% (100th percentile)
Actively exploited: Yes — listed in CISA KEV (added 2025-11-12)
EU (EUVD) id: EUVD-2025-29699
EU exploitation: Flagged exploited in the ENISA EU Vulnerability Database (since 2025-11-12)
Weakness: CWE-787
Affected product: Watchguard Fireware
Published: 2025-09-17
Last modified: 2026-06-17

Description

An Out-of-bounds Write vulnerability in WatchGuard Fireware OS 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.This vulnerability affects Fireware OS 11.10.2 up to and including 11.12.4_Update1, 12.0 up to and including 12.11.3 and 2025.1.

Frequently asked questions

What is CVE-2025-9242?: An Out-of-bounds Write vulnerability in WatchGuard Fireware OS 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.This vulnerability affects Fireware OS 11.10.2 up to and including 11.12.4_Update1, 12.0 up to and including 12.11.3 and 2025.1.
How severe is CVE-2025-9242?: CVE-2025-9242 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2025-9242 being actively exploited?: Yes. CVE-2025-9242 is on CISA's Known Exploited Vulnerabilities (KEV) catalog, added on 2025-11-12, which means active exploitation has been confirmed. It should be prioritised for remediation.
What products are affected by CVE-2025-9242?: CVE-2025-9242 primarily affects Watchguard Fireware. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2025-9242?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Because this CVE is known to be actively exploited, treat remediation as urgent — CISA KEV typically sets a short remediation deadline.
Does CVE-2025-9242 have an EU (EUVD) identifier?: Yes. CVE-2025-9242 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-29699. It is also flagged as exploited in the EUVD (since 2025-11-12).
When was CVE-2025-9242 published?: CVE-2025-9242 was published on 2025-09-17 and last updated on 2026-06-17.

References

Affected products (2)

cpe:2.3:o:watchguard:fireware:*:*:*:*:*:*:*:*
cpe:2.3:o:watchguard:fireware:2025.1:*:*:*:*:*:*:*

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