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CVE-2026-86132

7.5, high

WatchGuard Fireware OS Integer Underflow Vulnerability

NVD (opens in a new tab) CVE.org (opens in a new tab)
CVSS
7.5, high high CVSS v3.1
EPSS, next 30 days
0.4% higher than 28.3% of scored CVEs
Exploitation
No public evidence
Published
30 Sept 202617 days ago

Description

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.

Details

Vendor
WatchGuard
Product
Fireware OS
Weakness
CWE-191 (opens in a new tab)
Status
Analyzed
Updated
6 Oct 2026
Assigner
5d1c2695-1a31-4499-88ae-e847036fd7e3

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

References 1

Patches and fixes 1

The kind is read from NVD's tags where present and from the shape of the URL otherwise, so treat it as a hint.

Other WatchGuard CVEs

Every WatchGuard CVE we hold

Same vendor in what we hold, not a known link between the flaws.

  • CVE-2025-14733 WatchGuard Firebox Out of Bounds Write Vulnerability KEV EPSS 27% 9.8, critical
  • CVE-2025-9242 WatchGuard Firebox Out-of-Bounds Write Vulnerability KEV EPSS 92% 9.8, critical
  • CVE-2022-26318 WatchGuard Firebox and XTM Appliances Arbitrary Code Execution KEV EPSS 78% 9.8, critical
  • CVE-2022-23176 WatchGuard Firebox and XTM Privilege Escalation Vulnerability KEV EPSS 11% 8.8, high
  • CVE-2026-86131 WatchGuard Fireware OS Code Injection Vulnerability EPSS 0.4% 9.8, critical
  • CVE-2026-13046 WatchGuard Fireware OS Deserialization of Untrusted Data Vulnerability EPSS 0.4% 7.2, high
  • CVE-2026-18145 WatchGuard Fireware OS Stack-based Buffer Overflow Vulnerability EPSS 0.4% 7.2, high
  • CVE-2026-86104 WatchGuard Fireware OS Uncontrolled Resource Consumption Vulnerability EPSS 0.4% 7.5, high

Beyond this page

Is CVE-2026-86132 in your network?

This page tells you how dangerous CVE-2026-86132 is out there. Whether it sits on one of your devices, only a scan of your own network can tell. That is what our systems do, every day, for the companies we protect.

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    Find it before attackers do

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  • EXYS7950 KONDRA

    Detect it if it's exploited

    Until the patch is applied, Kondra monitors your network, events and endpoints in real time. It keeps an inventory of the software installed on every endpoint, and its anomaly detection rules flag what an attacker does once inside.

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Check your exposure

Assembled from the NVD 2.0 API, the CISA Known Exploited Vulnerabilities Catalog and FIRST EPSS. Scores are as of our last collection on 16 Oct 2026, not the live upstream state.