CVE-2026-86132

An integer underflow vulnerability in the WatchGuard Fireware OS IKEv2 daemon (iked) allows a remote, unauthenticated attacker to crash the process by sending a specially crafted encrypted IKEv2 message negotiated with an AES-GCM cipher suite.

  • Published Sep 30, 2026
  • CVSS 8.2 high
  • 0.4% chance of exploitation in the next 30 days (EPSS)

Affected software

CVE-2026-86132 at the National Vulnerability Database