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TI-2021-08062 Aliases CVE-2021-26112GHSA-fx4p-5h4m-vvxr

Out-of-bounds write in Fortinet FortiWAN

Priority MEDIUM 46CWE-787Published · Updated

Key facts

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

Attack profile from CVSS 3.1 · NVD. Fix status from CNA. Impact type from CWE-787 and the CVSS impact.

Summary

Multiple stack-based buffer overflow vulnerabilities [CWE-121] both in network daemons and in the command line interpreter of FortiWAN before 4.5.9 may allow an unauthenticated attacker to potentially corrupt control data in memory and execute arbitrary code via specifically crafted requests.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.01746 77th 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
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
FortinetFortinet FortiWANFortiWAN before 4.5.9—No fix listedCNA
  • Fortinet FortiWAN VendorFortinet Affected FortiWAN before 4.5.9 Fixed in — No fix listed CNA

CPE configurations NVD · 1

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

Remediation

No fixed version listed by the sources yet.

Timeline

  1. 2026-10-02 Threatist record created from CVE-2021-26112
  2. 2026-10-03 Alias added: GHSA-fx4p-5h4m-vvxr

References

Patch 1

  • TI-2021-08052 Authentication bypass in Fortinet FortiWAN CVSS 3.1CRITICAL 9.8
  • TI-2021-08064 SQL injection 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