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Back to active CVEs
Critical · CVSS 9.1CVE-2026-103593

Fireware OS Stack Buffer Overflow in Logging Service Allows Remote Code ExecutionCVE-2026-103593

Answer in brief

CVE-2026-103593 records a Critical severity (CVSS 9.1) vulnerability in Fireware OS Stack Buffer Overflow in Logging Service Allows Remote Code Execution. 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 9.1
Exploitation
Not marked as known exploited
Affected software
2 mapped packages or products
Fix availability
Available

Why this deserves its current priority

CVSS is 9.1. 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

A stack-based buffer overflow vulnerability in the Fireware OS logging service allows a network-adjacent attacker who can impersonate or intercept traffic to the configured log server to execute arbitrary code with root privileges by presenting a specially crafted certificate.

Quoted source text, attributed separately from HOL analysis.

Related CVEs

  • Fireware OS Heap Buffer Overflow in AD Authentication Service Allows Pre-Authentication Remote Code ExecutionSame watchguard/fireware os package
  • Fireware OS Stack Buffer Overflow in VPN Network Access Enforcement Allows Unprivileged Code ExecutionSame watchguard/fireware os package
  • Fireware OS Missing Command Validation allows Authenticated Arbitrary File Modification as RootSame watchguard/fireware os package
  • Fireware OS Missing Authentication in FireCluster Sync Allows Privilege EscalationSame watchguard/fireware os package
  • Fireware OS Out-of-Bounds Read in FireCluster Sync Allows Denial of ServiceSame watchguard/fireware os package
  • Substance3D - Painter | Stack-based Buffer Overflow (CWE-121)Also CWE-121

Record context

Vulnerability class
Memory Corruption
EPSS
Not reported
CWE IDs
CWE-121, CWE-787
Source
CVE List V5
Source checked
Oct 27, 2026
References
1 linked source
Open source record