Read the docs
TI-2021-08052 Aliases CVE-2021-26102GHSA-wwq6-xmjh-4f52

Authentication bypass in Fortinet FortiWAN

Priority HIGH 67CWE-305Published · Updated

Key facts

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

Attack profile from CVSS 3.1 · CNA. Fix status from CNA.

Summary

A relative path traversal vulnerability (CWE-23) in FortiWAN version 4.5.7 and below, 4.4 all versions may allow a remote non-authenticated attacker to delete files on the system by sending a crafted POST request. In particular, deleting specific configuration files will reset the Admin password to its default value.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.19721 97th 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
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
FortinetFortiWAN4.5.0 – 4.5.7; 4.4.0 – 4.4.1—No fix listedCNA
  • FortiWAN VendorFortinet Affected 4.5.0 – 4.5.7; 4.4.0 – 4.4.1 Fixed in — No fix listed CNA

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:fortinet:fortiwan:*:*:*:*:*:*:*:*4.4.0 to before 4.5.8VulnerableFortinet
  • cpe:2.3:a:fortinet:fortiwan:*:*:*:*:*:*:*:* Versions 4.4.0 to before 4.5.8 Vulnerable ·Fortinet

Remediation

No fixed version listed by the sources yet.

Timeline

  1. 2026-10-02 Threatist record created from CVE-2021-26102
  2. 2026-10-03 Alias added: GHSA-wwq6-xmjh-4f52

References

Advisory 1

  • TI-2021-08064 SQL injection in Fortinet FortiWAN CVSS 3.1CRITICAL 9.8
  • TI-2021-08062 Out-of-bounds write in Fortinet FortiWAN CVSS 3.1CRITICAL 9.8
  • TI-2016-04287 Fortinet FortiWan (formerly AscernLink) before 4.2.5 allows remote authenticated users… CVSS 3.0HIGH 8.8
  • TI-2022-14879 OS command injection in Fortinet FortiWAN CVSS 3.1HIGH 8.8
  • TI-2021-06326 OS command injection in Fortinet FortiWAN CVSS 3.1HIGH 8.8
  • TI-2023-23777 Path traversal in Fortinet FortiWAN CVSS 3.1HIGH 8.8
See all 15 →

Sources

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