---
title: "CVE-2026-86132: WatchGuard Fireware OS - Denial of Service"
description: "WatchGuard Fireware OS contains an integer underflow vulnerability in the IKEv2 daemon (iked) caused by processing specially crafted encrypted IKEv2 messages with AES-GCM cipher suite, letting remote unauthenticated attackers crash the process."
url: https://panop.io/threat-heartbeat/CVE-2026-86132/
---

# CVE-2026-86132 WatchGuard Fireware OS - Denial of Service

WatchGuard Fireware OS contains an integer underflow vulnerability in the IKEv2 daemon (iked) caused by processing specially crafted encrypted IKEv2 messages with AES-GCM cipher suite, letting remote unauthenticated attackers crash the process.

CVSS base score 7.5 /10

High

CISA KEV

Not listed

Public exploit

None known

Authentication

Not required

EPSS

0.36% chance of exploitation in 30 days

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-86132)

## Details

Type

Denial of Service

Impact

Denial Of Service

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Published

30 September 2026

Updated

15 October 2026

Weakness

[CWE-191](https://cwe.mitre.org/data/definitions/191.html)

## Vendor fix

Update to the latest version of WatchGuard Fireware OS.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

## References

- [https://nvd.nist.gov/vuln/detail/CVE-2026-86132](https://nvd.nist.gov/vuln/detail/CVE-2026-86132)
- [https://psirt.watchguard.com/CVE-2026-86132](https://psirt.watchguard.com/CVE-2026-86132)

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## What this record can't tell you

- Whether you run the affected software, and where
- Whether an attacker can actually reach and exploit it
- The misconfigurations that never get a CVE number
- What it would cost the business, ranked into what to fix first

Panop answers these inside your environment, for this CVE and every other finding.

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