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TI-2021-17881 Aliases CVE-2021-41017GHSA-qgc2-ccpf-f2fm

Out-of-bounds write in Fortinet FortiWeb

Priority MEDIUM 44CWE-787Published · 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 · CNA. Fix status from CNA. Impact type from CWE-787 and the CVSS impact.

Summary

Multiple heap-based buffer overflow vulnerabilities in some web API controllers of FortiWeb 6.4.1, 6.4.0, and 6.3.0 through 6.3.15 may allow a remote authenticated attacker to execute arbitrary code or commands via specifically crafted HTTP requests.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.01957 80th 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 FortiWebFortiWeb 6.4.1, 6.4.0, 6.3.0 through 6.3.15—No fix listedCNA
  • Fortinet FortiWeb VendorFortinet Affected FortiWeb 6.4.1, 6.4.0, 6.3.0 through 6.3.15 Fixed in — No fix listed CNA

CPE configurations NVD · 3

CPEVersionsRoleVendor
cpe:2.3:a:fortinet:fortiweb:*:*:*:*:*:*:*:*6.3.0 – 6.3.15VulnerableFortinet
cpe:2.3:a:fortinet:fortiweb:6.4.0:*:*:*:*:*:*:*6.4.0VulnerableFortinet
cpe:2.3:a:fortinet:fortiweb:6.4.1:*:*:*:*:*:*:*6.4.1VulnerableFortinet
  • cpe:2.3:a:fortinet:fortiweb:*:*:*:*:*:*:*:* Versions 6.3.0 – 6.3.15 Vulnerable ·Fortinet
  • cpe:2.3:a:fortinet:fortiweb:6.4.0:*:*:*:*:*:*:* Versions 6.4.0 Vulnerable ·Fortinet
  • cpe:2.3:a:fortinet:fortiweb:6.4.1:*:*:*:*:*:*:* Versions 6.4.1 Vulnerable ·Fortinet

Remediation

No fixed version listed by the sources yet.

Timeline

  1. 2026-10-02 Threatist record created from CVE-2021-41017
  2. 2026-10-03 Alias added: GHSA-qgc2-ccpf-f2fm

References

Patch 1

  • 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-2025-18919 SQL injection in Fortinet FortiWeb KEVCVSS 3.1CRITICAL 9.8
  • TI-2025-35886 OS command injection in Fortinet FortiWeb KEVCVSS 3.1MEDIUM 6.7
  • TI-2021-05113 OS command injection in Fortinet FortiWeb CVSS 3.1HIGH 8.8
  • TI-2021-18960 Stack-based buffer overflow in Fortinet FortiWeb CVSS 3.1CRITICAL 9.8
See all 125 →

Sources

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