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TI-2026-81382 Aliases CVE-2026-103593GHSA-5m22-q329-28xw

Stack buffer overflow in WatchGuard Fireware OS logging service

Priority MEDIUM 40CWE-121Published · Updated

Key facts

Attack vector
Local
Privileges required
None
User interaction
None
Attack complexity
Low
Attack requirements
Present
Impact type
—
Confidentiality · integrity · availability
None · High · High
Fix status
Fixed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA.

Summary

WatchGuard Fireware OS versions from 2025.1 before 2026.4, from 12.0 before 12.12.4, and from 12.0 before 12.5.22 are affected. A stack-based buffer overflow in the logging service writes past a fixed-size stack buffer (CWE-121). A network-adjacent attacker who can impersonate or intercept traffic to the configured log server can execute arbitrary code with root privileges by presenting a specially crafted certificate.

Written with Claude Haiku 5.5 from the sources below · 2026-10-29

Description from the CNA

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.001 0th percentileScored 2026-11-07
Fix Fixed Fireware OS (WatchGuard): 2026.4, 12.12.4, 12.5.22

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
WatchGuardFireware OS2025.1 to before 2026.4; 12.0 to before 12.12.42026.4, 12.12.4Patch availableCNA
WatchGuardFireware OS12.0 to before 12.5.2212.5.22Patch availableCNA
  • Fireware OS VendorWatchGuard Affected 2025.1 to before 2026.4; 12.0 to before 12.12.4 Fixed in 2026.4, 12.12.4 Patch available CNA
  • Fireware OS VendorWatchGuard Affected 12.0 to before 12.5.22 Fixed in 12.5.22 Patch available CNA

CPE names Threatist (inferred) · 1

Inferred from how NVD named this product before; not given by a source.

CPEVersionsRoleVendor
cpe:2.3:o:watchguard:fireware:*:*:*:*:*:*:*:*——WatchGuard
  • cpe:2.3:o:watchguard:fireware:*:*:*:*:*:*:*:* Versions — — ·WatchGuard

Remediation

Upgrade Fireware OS to 2026.4, 12.12.4, or 12.5.22, depending on the release branch in use.

Written with Claude Haiku 5.5 from the sources below · 2026-10-29

  • Fix · CNA Fireware OS (WatchGuard) Fixed in 2026.4, 12.12.4
  • Fix · CNA Fireware OS (WatchGuard) Fixed in 12.5.22

Fixed in the same release

Records fixed by the same vendor advisory or release, as the CNA lists them.

  • Release ·

    WatchGuard Fireware OS 12.12.4, 2026.4

    17 records Highest priority Priority MEDIUM 9 MEDIUM, 8 LOW

    Other records, highest priority first

    • TI-2026-81380 Fireware OS FireCluster Daemon Lacks Authentication, Allows Remote Root ActionsPriority MEDIUM 48
    • TI-2026-81377 Stack buffer overflow in WatchGuard Fireware OS SIP proxyPriority MEDIUM 48
    • TI-2026-81386 NULL pointer dereference in WatchGuard Fireware OS management loginPriority MEDIUM 44
    Show all 17 records →
  • Release ·

    WatchGuard Fireware OS 12.5.22

    14 records Highest priority Priority MEDIUM 8 MEDIUM, 6 LOW

    Other records, highest priority first

    • TI-2026-81380 Fireware OS FireCluster Daemon Lacks Authentication, Allows Remote Root ActionsPriority MEDIUM 48
    • TI-2026-81377 Stack buffer overflow in WatchGuard Fireware OS SIP proxyPriority MEDIUM 48
    • TI-2026-81386 NULL pointer dereference in WatchGuard Fireware OS management loginPriority MEDIUM 44
    Show all 14 records →

Timeline

  1. 2026-10-27 Threatist record created from CVE-2026-103593
  2. 2026-10-27 Alias added: GHSA-5m22-q329-28xw
  3. 2026-10-28 Priority changed: MEDIUM → LOW
  4. 2026-10-29 CISA SSVC decision points changed
  5. 2026-10-29 Priority changed: LOW → MEDIUM
  6. 2026-10-29 CISA SSVC decision points changed

References

Advisory 1

  • TI-2022-09698 On WatchGuard Firebox and XTM appliances, an unauthenticated user can execute arbitrary… KEVCVSS 3.1CRITICAL 9.8
  • TI-2025-13451 WatchGuard Firebox iked Out of Bounds Write Vulnerability KEVCVSS 4.0CRITICAL 9.3
  • TI-2025-08474 WatchGuard Firebox iked Out of Bounds Write Vulnerability KEVCVSS 4.0CRITICAL 9.3
  • TI-2022-07330 WatchGuard Firebox and XTM appliances allow a remote attacker with unprivileged… KEVCVSS 3.1HIGH 8.8
  • TI-2023-19293 A DLL hijacking vulnerability in Panda Security VPN for Windows prior to version v15.14.8… CVSS 3.1MEDIUM 6.5
  • TI-2015-04587 Watchguard XCS 9.2 and 10.0 before build 150522 allow remote authenticated users to… CVSS 2.0MEDIUM 6.5
See all 203 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences