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  4. CVE 2026 93866 fireware os pre authentication integer overflow
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Back to active CVEs
Critical · CVSS 9.2CVE-2026-93866

Fireware OS Pre-Authentication Integer Overflow in Access Portal Allows Out-of-Bounds WriteCVE-2026-93866

Answer in brief

CVE-2026-93866 records a Critical severity (CVSS 9.2) vulnerability in Fireware OS Pre-Authentication Integer Overflow in Access Portal Allows Out-of-Bounds Write. The current sources do not mark it as known exploited. The current feed maps WatchGuard/Fireware OS (generic), WatchGuard/Fireware OS (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Oct 27, 2026Updated Oct 27, 2026Source checked Oct 27, 2026First seen by HOL Oct 27, 2026Material review Oct 27, 2026
Upstream Advisory

Key facts

Risk
Critical · CVSS 9.2
Exploitation
Not marked as known exploited
Affected software
2 mapped packages or products
Fix availability
Available

Why this deserves its current priority

CVSS is 9.2. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps WatchGuard/Fireware OS (generic), WatchGuard/Fireware OS (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
PackageAffected rangeFixed version
WatchGuard/Fireware OSgeneric>=2025.1 <2026.4 || >=12.0 <12.12.42026.4, 12.12.4
WatchGuard/Fireware OSgeneric>=12.0 <12.5.2212.5.22

Recommended response

  1. 1Check inventory. Check lockfiles and deployed manifests for WatchGuard/Fireware OS, WatchGuard/Fireware OS.
  2. 2Review the reported fix. Source-reported solution: Fireware OS 2026.4, Fireware OS 12.12.4, Fireware OS 12.5.22

Evidence timeline and material changes

  1. Published upstream

    Oct 27, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  2. Source modified

    Oct 27, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  3. First seen by HOL

    Oct 27, 2026

Sources and claim methodology

  • Source referencepsirt.watchguard.com
Upstream source 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.

Quoted source text, attributed separately from HOL analysis.

Related CVEs

  • Asterisk: Stack buffer overflow in res_xmpp XMPP namespace prefix handlingAlso CWE-787

Record context

Vulnerability class
Memory Corruption
EPSS
Not reported
CWE IDs
CWE-190, CWE-288, CWE-787
Source
CVE List V5
Source checked
Oct 27, 2026
References
1 linked source
Open source record