TI-2026-81026 Aliases CVE-2026-106174 GHSA-jq7m-wj67-4h5c

Improper locking in Fortinet FortiOS allows denial of service

LOW 35CWE-667Published 2026-10-27 · Updated 2026-10-27

Key facts

Attack vector: Network
Privileges required: None
User interaction: None
Attack complexity: Low
Impact type: Denial of service
Confidentiality · integrity · availability: None · None · High
Fix status: No fix listed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA. Impact type from CWE-667 and the CVSS impact.

Summary

Fortinet FortiOS versions from 8.0.0 and 7.6.4 through 7.6.6 are affected. An improper locking flaw (CWE-667) lets an unauthenticated remote attacker with network access to the device cause a denial of service of the HTTPS management interface by sending crafted HTTP requests. The CVSS vector rates availability impact as high and confidentiality and integrity impact as none.

Written with Claude Haiku 5.5 from the sources below · 2026-10-28

Description from the CNA

A improper locking vulnerability in Fortinet FortiOS 8.0.0, FortiOS 7.6.4 through 7.6.6 may allow an unauthenticated attacker with network access to the device to cause a denial of service of the HTTPS management interface via crafted HTTP requests.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV

EPSS 0.00282 20th percentileScored 2026-11-07

Fix No fix listed No fixed version in the sources yet

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: None
Automatable: Yes
Technical impact: Partial

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

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
Fortinet	FortiOS	8.0.0; 7.6.4 – 7.6.6	—	No fix listed	CNA

FortiOS VendorFortinet Affected 8.0.0; 7.6.4 – 7.6.6 Fixed in — No fix listed CNA

CPE names CNA · 4

CPE	Versions	Role	Vendor
cpe:2.3:o:fortinet:fortios:8.0.0:::::::*	8.0.0	—	Fortinet
cpe:2.3:o:fortinet:fortios:7.6.6:::::::*	7.6.6	—	Fortinet
cpe:2.3:o:fortinet:fortios:7.6.5:::::::*	7.6.5	—	Fortinet
cpe:2.3:o:fortinet:fortios:7.6.4:::::::*	7.6.4	—	Fortinet

cpe:2.3:o:fortinet:fortios:8.0.0:*:*:*:*:*:*:* Versions 8.0.0 — ·Fortinet
cpe:2.3:o:fortinet:fortios:7.6.6:*:*:*:*:*:*:* Versions 7.6.6 — ·Fortinet
cpe:2.3:o:fortinet:fortios:7.6.5:*:*:*:*:*:*:* Versions 7.6.5 — ·Fortinet
cpe:2.3:o:fortinet:fortios:7.6.4:*:*:*:*:*:*:* Versions 7.6.4 — ·Fortinet

Remediation

The sources list no fixed version for Fortinet FortiOS.

Written with Claude Haiku 5.5 from the sources below · 2026-10-28

Timeline

2026-10-27 Threatist record created from CVE-2026-106174
2026-10-27 CISA SSVC decision points changed
2026-10-27 Priority changed: MEDIUM → LOW
2026-10-27 Alias added: GHSA-jq7m-wj67-4h5c

References

Other 1

https://fortiguard.fortinet.com/psirt/FG-IR-26-181

TI-2026-65779 Path traversal in Fortinet FortiMail KEVCVSS 3.1CRITICAL 9.8
TI-2026-20057 Authentication bypass in Fortinet FortiWeb KEVCVSS 3.1CRITICAL 9.4
TI-2025-39856 Path traversal in Fortinet FortiWeb KEVCVSS 3.1CRITICAL 9.4
TI-2025-23811 Stack-based buffer overflow in Fortinet FortiNDR KEVCVSS 3.1CRITICAL 9.8
TI-2025-18919 SQL injection in Fortinet FortiWeb KEVCVSS 3.1CRITICAL 9.8
TI-2025-18911 Heap-based buffer overflow in Fortinet FortiSwitchManager KEVCVSS 3.1CRITICAL 9.8

See all 1170 →

Sources

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