CVE-2026-86133

Fireware OS Pre-Authentication Integer Underflow in iked Allows Remote Denial of Service

CVSS 4.0 8.2 HIGHCheck source for fixed versionsKEV status unknown

Original advisory

Historical advisory recorded 23 Oct 2026 15:48:27 UTC. Read the latest advisory.

cve-program · CVE-2026-86133

Published

An integer underflow vulnerability in the WatchGuard Fireware OS IKE daemon (iked) allows a remote attacker who has completed the initial IKEv2 handshake to crash the iked process by sending a specially crafted encrypted IKEv2 message, resulting in a denial of service.

Read the publisher's advisory

Affected versions, risk and source history

cve-program · CVE-2026-86133

Published

Fireware OS

Vendor product

Publisher's version information

Shown as published. These rules are not interpreted as NuGet package version ranges.

{
                    "vendor": "WatchGuard",
                    "product": "Fireware OS",
                    "versions": [
                        {
                            "status": "affected",
                            "version": "2026.3",
                            "versionType": "custom",
                            "lessThan": "2026.3.2"
                        },
                        {
                            "status": "affected",
                            "version": "2025.0",
                            "versionType": "custom",
                            "lessThan": "2026.2.3"
                        },
                        {
                            "status": "affected",
                            "version": "12.0",
                            "versionType": "custom",
                            "lessThan": "12.12.3"
                        }
                    ],
                    "defaultStatus": "unaffected",
                    "platforms": [
                        "Default"
                    ]
                }

Fireware OS

Vendor product

Publisher's version information

Shown as published. These rules are not interpreted as NuGet package version ranges.

{
                    "vendor": "WatchGuard",
                    "product": "Fireware OS",
                    "versions": [
                        {
                            "status": "affected",
                            "version": "12.0",
                            "versionType": "custom",
                            "lessThan": "12.5.21"
                        }
                    ],
                    "defaultStatus": "unaffected",
                    "platforms": [
                        "T15/T35"
                    ]
                }

Original source record · Cite this exact observation · Complete original publisher JSON