CVE-2026-78009: high-severity vulnerability in WatchGuard Fireware OS
Fireware OS Out-of-Bounds Read in iked Allows Unauthenticated Denial of Service (DoS)
Published · Updated
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21Vexday Risk Score
No sign of exploitation. No public exploitation artifact known so far.
ssvc Trackcvss 8.7epss 0.5%
An out-of-bounds read vulnerability in the WatchGuard Fireware OS iked process allows a remote unauthenticated attacker to create a Denial of Service (DoS) condition in VPN processing by sending specially crafted network traffic.
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N
Affected products
WatchGuard · Fireware OSRelated CVEs — WatchGuard Fireware OS
In the same product, most dangerous first.
CVE-2025-9242CRITICALWatchGuard Firebox iked Out of Bounds Write VulnerabilityEPSS 92.2%KEVCVE-2025-14733CRITICALWatchGuard Firebox iked Out of Bounds Write VulnerabilityEPSS 29.4%KEVCVE-2026-3342HIGHWatchGuard Firebox Out of Bounds Write VulnerabilityEPSS 6.4%CVE-2022-31749MEDIUMAuthenticated arbitrary file read/write in WatchGuard Fireware OSEPSS 1.3%CVE-2024-5974HIGHFirebox Authenticated Buffer Overflow VulnerabilityEPSS 1.1%CVE-2026-13368CRITICALWatchGuard Firebox Race Condition and Use-After-Free in Mobile VPN with IKEv2 LDAP AuthenticationEPSS 0.9%