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CVE-2021-41028

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2021-12-16 · updated 2026-06-17
• Weakness: CWE-295

Description

A combination of a use of hard-coded cryptographic key vulnerability [CWE-321] in FortiClientEMS 7.0.1 and below, 6.4.6 and below and an improper certificate validation vulnerability [CWE-297] in FortiClientWindows, FortiClientLinux and FortiClientMac 7.0.1 and below, 6.4.6 and below may allow an unauthenticated and network adjacent attacker to perform a man-in-the-middle attack between the EMS and the FCT via the telemetry protocol.

Affected products

• Fortinet FortiClientWindows: from 6.0.0 through 6.0.9; from 6.2.0 through 6.2.9; from 6.4.0 through 6.4.6; 7.0.0, 7.0.1
• Fortinet FortiClient EMS: from 6.2.0 through 6.2.9; from 6.4.0 through 6.4.6; 7.0.0, 7.0.1

References

• https://fortiguard.com/advisory/FG-IR-21-075
• https://fortiguard.com/advisory/FG-IR-21-075

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