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TI-2026-58927 Aliases CVE-2026-86133GHSA-c7wr-f27v-pxx3

Fireware OS Pre-Authentication Integer Underflow in iked Allows Remote Denial of Service

Priority LOW 36CWE-1284Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Attack requirements
Present
Impact type
Denial of service
Confidentiality · integrity · availability
None · None · High
Fix status
Fixed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-191 and the CVSS impact.

Summary

An integer underflow vulnerability in the WatchGuard Fireware OS IKE daemon (iked) allows a remote attacker who has completed the initial IKEv2 handshake to crash the iked process by sending a specially crafted encrypted IKEv2 message, resulting in a denial of service.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00346 28th percentileScored 2026-11-07
Fix Fixed Fireware OS (WatchGuard): 2026.3.2, 2026.2.3, 12.12.3 +1

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Partial

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 OS2026.3 to before 2026.3.2; 2025.0 to before 2026.2.3; 12.0 to before 12.12.32026.3.2, 2026.2.3, 12.12.3Patch availableCNA
WatchGuardFireware OS12.0 to before 12.5.2112.5.21Patch availableCNA
  • Fireware OS VendorWatchGuard Affected 2026.3 to before 2026.3.2; 2025.0 to before 2026.2.3; 12.0 to before 12.12.3 Fixed in 2026.3.2, 2026.2.3, 12.12.3 Patch available CNA
  • Fireware OS VendorWatchGuard Affected 12.0 to before 12.5.21 Fixed in 12.5.21 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

  • Fix · CNA Fireware OS (WatchGuard) Fixed in 2026.3.2, 2026.2.3, 12.12.3
  • Fix · CNA Fireware OS (WatchGuard) Fixed in 12.5.21

Fixed in the same release

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

  • Release ·

    WatchGuard Fireware OS 12.12.3, 2026.2.3, 2026.3.2

    14 records Highest priority Priority MEDIUM 4 MEDIUM, 10 LOW

    Other records, highest priority first

    • TI-2026-58925 Fireware OS Code Injection in BOVPN Over TLS Client Allows Remote Code ExecutionPriority MEDIUM 48
    • TI-2026-58904 Fireware OS Resource Exhaustion in Login Process Allows Denial of ServicePriority MEDIUM 44
    • TI-2026-58926 Fireware OS Pre-Authentication Integer Underflow in iked Allows Denial of ServicePriority MEDIUM 42
    Show all 14 records →
  • Release ·

    WatchGuard Fireware OS 12.5.21

    12 records Highest priority Priority MEDIUM 4 MEDIUM, 8 LOW

    Other records, highest priority first

    • TI-2026-58925 Fireware OS Code Injection in BOVPN Over TLS Client Allows Remote Code ExecutionPriority MEDIUM 48
    • TI-2026-58904 Fireware OS Resource Exhaustion in Login Process Allows Denial of ServicePriority MEDIUM 44
    • TI-2026-58926 Fireware OS Pre-Authentication Integer Underflow in iked Allows Denial of ServicePriority MEDIUM 42
    Show all 12 records →

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-86133
  2. 2026-10-03 Alias added: GHSA-c7wr-f27v-pxx3

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