Description
An integer overflow vulnerability in the WebSocket connection handling used by WatchGuard Fireware OS's Access Portal allows a remote, unauthenticated attacker to write beyond the bounds of a heap buffer by sending a specially crafted request while the Access Portal feature is enabled.
Published: 2026-10-27
Score: 9.2 Critical
EPSS: n/a
KEV: No
Impact: n/a
Action: n/a
AI Analysis

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Remediation

Vendor Solution

Fireware OS 2026.4, Fireware OS 12.12.4, Fireware OS 12.5.22

Tracking

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Advisories

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History

Tue, 27 Oct 2026 16:00:00 +0000

Type Values Removed Values Added
Description An integer overflow vulnerability in the WebSocket connection handling used by WatchGuard Fireware OS's Access Portal allows a remote, unauthenticated attacker to write beyond the bounds of a heap buffer by sending a specially crafted request while the Access Portal feature is enabled.
Title Fireware OS Pre-Authentication Integer Overflow in Access Portal Allows Out-of-Bounds Write
First Time appeared Watchguard
Watchguard fireware Os
Weaknesses CWE-190
CWE-288
CWE-787
CPEs cpe:2.3:a:watchguard:fireware_os:*:*:*:*:*:*:*:*
Vendors & Products Watchguard
Watchguard fireware Os
References
Metrics cvssV4_0

{'score': 9.2, 'vector': 'CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N'}

Subscriptions

Watchguard Fireware Os
cve-icon MITRE

Status: PUBLISHED

Assigner: WatchGuard

Published:

Updated: 2026-10-27T15:52:27.871Z

Reserved: 2026-09-18T19:29:25.403Z

Link: CVE-2026-93866

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Received

Published: 2026-10-27T16:17:33.013

Modified: 2026-10-27T16:17:33.013

Link: CVE-2026-93866

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

No data.

Weaknesses
  • CWE-190

    Integer Overflow or Wraparound

  • CWE-288

    Authentication Bypass Using an Alternate Path or Channel

  • CWE-787

    Out-of-bounds Write