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TI-2021-19136 Aliases CVE-2021-43074GHSA-wcqx-g82p-992c

Improper signature verification in Fortinet FortiSwitch

Priority LOW 20CWE-347Published · Updated

Key facts

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

Attack profile from CVSS 3.1 · NVD. Fix status from CNA. Impact type from CWE-347.

Summary

An improper verification of cryptographic signature vulnerability [CWE-347] in FortiWeb 6.4 all versions, 6.3.16 and below, 6.2 all versions, 6.1 all versions, 6.0 all versions; FortiOS 7.0.3 and below, 6.4.8 and below, 6.2 all versions, 6.0 all versions; FortiSwitch 7.0.3 and below, 6.4.10 and below, 6.2 all versions, 6.0 all versions; FortiProxy 7.0.1 and below, 2.0.7 and below, 1.2 all versions, 1.1 all versions, 1.0 all versions may allow an attacker to decrypt portions of the administrative session management cookie if able to intercept the latter.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00287 21st 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
Partial

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

Affected products

VendorProductAffected versionsFixed inStatusSource
FortinetFortiSwitch7.0.0 – 7.0.3; 6.4.0 – 6.4.10; 6.2.0 – 6.2.7; 6.0.0 – 6.0.7—No fix listedCNA
FortinetFortiWeb6.4.0 – 6.4.2; 6.3.0 – 6.3.16; 6.2.0 – 6.2.7; 6.1.0 – 6.1.3; 6.0.0 – 6.0.8—No fix listedCNA
FortinetFortiProxy7.0.0 – 7.0.1; 2.0.0 – 2.0.7; 1.2.0 – 1.2.13; 1.1.0 – 1.1.6; 1.0.0 – 1.0.7—No fix listedCNA
FortinetFortiOS7.0.0 – 7.0.3; 6.4.0 – 6.4.8; 6.2.0 – 6.2.12; 6.0.0 – 6.0.16—No fix listedCNA
  • FortiSwitch VendorFortinet Affected 7.0.0 – 7.0.3; 6.4.0 – 6.4.10; 6.2.0 – 6.2.7; 6.0.0 – 6.0.7 Fixed in — No fix listed CNA
  • FortiWeb VendorFortinet Affected 6.4.0 – 6.4.2; 6.3.0 – 6.3.16; 6.2.0 – 6.2.7; 6.1.0 – 6.1.3; 6.0.0 – 6.0.8 Fixed in — No fix listed CNA
  • FortiProxy VendorFortinet Affected 7.0.0 – 7.0.1; 2.0.0 – 2.0.7; 1.2.0 – 1.2.13; 1.1.0 – 1.1.6; 1.0.0 – 1.0.7 Fixed in — No fix listed CNA
  • FortiOS VendorFortinet Affected 7.0.0 – 7.0.3; 6.4.0 – 6.4.8; 6.2.0 – 6.2.12; 6.0.0 – 6.0.16 Fixed in — No fix listed CNA

CPE configurations NVD · 4

CPEVersionsRoleVendor
cpe:2.3:a:fortinet:fortiproxy:*:*:*:*:*:*:*:*1.0.0 to before 2.0.8; 7.0.0 to before 7.0.2VulnerableFortinet
cpe:2.3:a:fortinet:fortiweb:*:*:*:*:*:*:*:*6.0.0 to before 6.3.17; 6.4.0 to before 7.0.0VulnerableFortinet
cpe:2.3:o:fortinet:fortios:*:*:*:*:*:*:*:*6.0.0 to before 6.4.9; 7.0.0 to before 7.0.4VulnerableFortinet
cpe:2.3:o:fortinet:fortiswitch:*:*:*:*:*:*:*:*6.0.0 to before 6.4.11; 7.0.0 to before 7.0.4VulnerableFortinet
  • cpe:2.3:a:fortinet:fortiproxy:*:*:*:*:*:*:*:* Versions 1.0.0 to before 2.0.8; 7.0.0 to before 7.0.2 Vulnerable ·Fortinet
  • cpe:2.3:a:fortinet:fortiweb:*:*:*:*:*:*:*:* Versions 6.0.0 to before 6.3.17; 6.4.0 to before 7.0.0 Vulnerable ·Fortinet
  • cpe:2.3:o:fortinet:fortios:*:*:*:*:*:*:*:* Versions 6.0.0 to before 6.4.9; 7.0.0 to before 7.0.4 Vulnerable ·Fortinet
  • cpe:2.3:o:fortinet:fortiswitch:*:*:*:*:*:*:*:* Versions 6.0.0 to before 6.4.11; 7.0.0 to before 7.0.4 Vulnerable ·Fortinet

Remediation

No fixed version listed by the sources yet.

Timeline

  1. 2026-10-02 Threatist record created from CVE-2021-43074
  2. 2026-10-03 Alias added: GHSA-wcqx-g82p-992c

References

Advisory 1

  • TI-2026-20057 Authentication bypass in Fortinet FortiWeb KEVCVSS 3.1CRITICAL 9.4
  • TI-2025-18911 Heap-based buffer overflow in Fortinet FortiSwitchManager KEVCVSS 3.1CRITICAL 9.8
  • TI-2024-36904 Authentication bypass in Fortinet FortiOS KEVCVSS 3.1CRITICAL 9.8
  • TI-2024-15234 A use of externally-controlled format string in Fortinet FortiOS versions 7.4.0 through… KEVCVSS 3.1CRITICAL 9.8
  • TI-2024-14448 Out-of-bounds write in Fortinet FortiOS KEVCVSS 3.1CRITICAL 9.8
  • TI-2023-12585 Heap-based buffer overflow in Fortinet FortiOS-6K7K KEVCVSS 3.1CRITICAL 9.8
See all 276 →

Sources

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