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TI-2021-17880 Aliases CVE-2021-41016GHSA-8h76-r3wq-wvqp

A improper neutralization of special elements used in a command ('command injection') in…

Priority MEDIUM 42CWE-78Published · Updated

Key facts

Attack vector
Network
Privileges required
Low
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-78.

Summary

A improper neutralization of special elements used in a command ('command injection') in Fortinet FortiExtender version 7.0.1 and below, 4.2.3 and below, 4.1.7 and below allows an authenticated attacker to execute privileged shell commands via CLI commands including special characters

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.01055 64th 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
——all versions—No fix listedCNA
  • — Vendor— Affected all versions Fixed in — No fix listed CNA

CPE configurations NVD · 2

CPEVersionsRoleVendor
cpe:2.3:o:fortinet:fortiextender_firmware:*:*:*:*:*:*:*:*4.1.1 to before 4.1.8; 4.2.0 to before 4.2.4; 7.0.0 to before 7.0.2VulnerableFortinet
cpe:2.3:h:fortinet:fortiextender:-:*:*:*:*:*:*:*not specified by NVDRunning onFortinet
  • cpe:2.3:o:fortinet:fortiextender_firmware:*:*:*:*:*:*:*:* Versions 4.1.1 to before 4.1.8; 4.2.0 to before 4.2.4; 7.0.0 to before 7.0.2 Vulnerable ·Fortinet
  • cpe:2.3:h:fortinet:fortiextender:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Fortinet

Remediation

No fixed version listed by the sources yet.

Timeline

  1. 2026-10-02 Threatist record created from CVE-2021-41016
  2. 2026-10-03 Alias added: GHSA-8h76-r3wq-wvqp

References

Advisory 1

  • TI-2024-15681 Improper access control in Fortinet FortiExtender CVSS 3.1HIGH 8.8
  • TI-2022-07507 Path traversal in Fortinet FortiExtender CVSS 3.1HIGH 7.5
  • TI-2025-39604 OS command injection in Fortinet FortiExtender CVSS 3.1HIGH 7.2
  • TI-2022-10504 OS command injection in Fortinet FortiExtender CVSS 3.1HIGH 7.2
  • TI-2025-29426 Buffer overflow in Fortinet FortiExtender CVSS 3.1HIGH 7.8
  • TI-2025-29425 A debug messages revealing unnecessary information vulnerability in Fortinet… CVSS 3.1MEDIUM 5.2

Sources

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