Root access on core firewall devices via management interface; widely deployed WatchGuard platforms.
CVE-2026-3342
WatchGuard Fireware OS OOB write lets privileged admin gain root via exposed management interface.
Is CVE-2026-3342 being exploited?
Not confirmed. CVE-2026-3342 does not appear in CISA's Known Exploited Vulnerabilities catalog, which records only exploitation that has been observed and reported publicly. That is evidence of absence of a report, not evidence the flaw is unattacked. EPSS currently estimates a 6.4% probability of exploitation in the next 30 days.
How severe is CVE-2026-3342?
CVE-2026-3342 is rated High with a CVSS score of 8.6. Severity describes how bad exploitation would be, not how likely it is: pair it with exploitation evidence before deciding what to patch first.
Is there a patch for CVE-2026-3342?
Yes. A fix has been recorded for CVE-2026-3342. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-3342 affect?
CVE-2026-3342 affects WatchGuard Fireware OS (11.9–11.12.4_Update1, 12.0–12.11.7, 2025.1–2026.1.1), WatchGuard Firebox appliances. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-3342?
Patch to the latest Fireware OS version.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Authenticated admin can execute code with root privileges on affected devices via the exposed management interface.
Immediate action required
- affected>= 11.9 and <= 11.12.4+541730
- affected>= 12.0 and <= 12.11.7
- affected>= 12.5 and <= 12.5.16
- affected>= 2025.1 and <= 2026.1.1
As published in the CVE Program record. A version outside these ranges is not a statement that it is unaffected — vendors sometimes understate a range, and distribution-backported builds carry upstream numbers that do not reflect what was patched into them.