CVE-2021-41028: fortinet forticlient Improper Certificate Validation
Vulnerability summary
CVE-2021-41028 is a high (CVSS 8.2) Improper Certificate Validation vulnerability in fortinet forticlient. EPSS estimates a 0.23% chance of exploitation in the next 30 days, higher than 12.8% of scored vulnerabilities.
Timeline
- 16-12-2021PublishedVulnerability first disclosed.
- 25-10-2024Last modifiedVulnerability information updated.
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.
CVSS metrics
3 scores · 2 sources · 2 versions- NVDNIST7.5HighCVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:HDiffers
EPSS trend
Probability
0.23%
Chance of exploitation in the next 30 days
Percentile
13%
Versus all other CVEs
30-day change
+0.02 pp
From 0.21% on 19-09-2026
Known exploited
Compare KEV catalogsNot in any of the 3 tracked catalogs.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root causeAffected systems
Fortinet3 products
- forticlient≥ 6.0.0, ≤ 6.0.9 | ≥ 6.2.0, ≤ 6.2.9 | ≥ 6.4.0, ≤ 6.4.6 | 7.0.0 | 7.0.1
- forticlient_endpoint_management_server≥ 6.2.0, ≤ 6.2.9 | ≥ 6.4.0, ≤ 6.4.6 | 7.0.0 | 7.0.1
- fortinet forticlientems, forticlientwindows, forticlientlinux, forticlientmacFortiClientEMS 7.0.1 and below, 6.4.6 and below, FortiClientWindows, FortiClientLinux, FortiClientMac 7.0.1 and below, 6.4.6 and below.
1 vendor · 3 products