Improper certificate validation in Fortinet FortiClientEMS, FortiClientWindows…
Priority LOW 35CWE-295Published · Updated
Key facts
- Attack vector
- Adjacent network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- High
- Impact type
- Spoofing, Security bypass
- Confidentiality · integrity · availability
- Low · High · High
- Fix status
- No fix listed
Attack profile from CVSS 3.1 · CNA. Fix status from CNA. Impact type from CWE-295 and CWE-798.
Summary
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.
Why it matters now
Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00229 13th 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
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| Fortinet | Fortinet FortiClientEMS, FortiClientWindows, FortiClientLinux, FortiClientMac | FortiClientEMS 7.0.1 and below, 6.4.6 and below, FortiClientWindows, FortiClientLinux, FortiClientMac 7.0.1 and below, 6.4.6 and below. | — | No fix listed | CNA |
- Fortinet FortiClientEMS, FortiClientWindows, FortiClientLinux, FortiClientMac VendorFortinet Affected FortiClientEMS 7.0.1 and below, 6.4.6 and below, FortiClientWindows, FortiClientLinux, FortiClientMac 7.0.1 and below, 6.4.6 and below. Fixed in — No fix listed CNA
CPE configurations NVD · 17
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:fortinet:forticlient:*:*:*:*:*:macos:*:* | 6.0.0 – 6.0.9 | Vulnerable | Fortinet |
| cpe:2.3:a:fortinet:forticlient:*:*:*:*:*:windows:*:* | 6.0.0 – 6.0.9 | Vulnerable | Fortinet |
| cpe:2.3:a:fortinet:forticlient:*:*:*:*:*:linux:*:* | 6.2.0 – 6.2.9 | Vulnerable | Fortinet |
| cpe:2.3:a:fortinet:forticlient:*:*:*:*:*:macos:*:* | 6.2.0 – 6.2.9 | Vulnerable | Fortinet |
| cpe:2.3:a:fortinet:forticlient:*:*:*:*:*:windows:*:* | 6.2.0 – 6.2.9 | Vulnerable | Fortinet |
| cpe:2.3:a:fortinet:forticlient:*:*:*:*:*:linux:*:* | 6.4.0 – 6.4.6 | Vulnerable | Fortinet |
| cpe:2.3:a:fortinet:forticlient:*:*:*:*:*:macos:*:* | 6.4.0 – 6.4.6 | Vulnerable | Fortinet |
| cpe:2.3:a:fortinet:forticlient:*:*:*:*:*:windows:*:* | 6.4.0 – 6.4.6 | Vulnerable | Fortinet |
| cpe:2.3:a:fortinet:forticlient:7.0.0:*:*:*:*:linux:*:* | 7.0.0 | Vulnerable | Fortinet |
| cpe:2.3:a:fortinet:forticlient:7.0.0:*:*:*:*:macos:*:* | 7.0.0 | Vulnerable | Fortinet |
- cpe:2.3:a:fortinet:forticlient:*:*:*:*:*:macos:*:* Versions 6.0.0 – 6.0.9 Vulnerable ·Fortinet
- cpe:2.3:a:fortinet:forticlient:*:*:*:*:*:windows:*:* Versions 6.0.0 – 6.0.9 Vulnerable ·Fortinet
- cpe:2.3:a:fortinet:forticlient:*:*:*:*:*:linux:*:* Versions 6.2.0 – 6.2.9 Vulnerable ·Fortinet
- cpe:2.3:a:fortinet:forticlient:*:*:*:*:*:macos:*:* Versions 6.2.0 – 6.2.9 Vulnerable ·Fortinet
- cpe:2.3:a:fortinet:forticlient:*:*:*:*:*:windows:*:* Versions 6.2.0 – 6.2.9 Vulnerable ·Fortinet
- cpe:2.3:a:fortinet:forticlient:*:*:*:*:*:linux:*:* Versions 6.4.0 – 6.4.6 Vulnerable ·Fortinet
- cpe:2.3:a:fortinet:forticlient:*:*:*:*:*:macos:*:* Versions 6.4.0 – 6.4.6 Vulnerable ·Fortinet
- cpe:2.3:a:fortinet:forticlient:*:*:*:*:*:windows:*:* Versions 6.4.0 – 6.4.6 Vulnerable ·Fortinet
- cpe:2.3:a:fortinet:forticlient:7.0.0:*:*:*:*:linux:*:* Versions 7.0.0 Vulnerable ·Fortinet
- cpe:2.3:a:fortinet:forticlient:7.0.0:*:*:*:*:macos:*:* Versions 7.0.0 Vulnerable ·Fortinet
Show 7 more CPE
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:fortinet:forticlient:7.0.0:*:*:*:*:windows:*:* | 7.0.0 | Vulnerable | Fortinet |
| cpe:2.3:a:fortinet:forticlient:7.0.1:*:*:*:*:linux:*:* | 7.0.1 | Vulnerable | Fortinet |
| cpe:2.3:a:fortinet:forticlient:7.0.1:*:*:*:*:macos:*:* | 7.0.1 | Vulnerable | Fortinet |
| cpe:2.3:a:fortinet:forticlient:7.0.1:*:*:*:*:windows:*:* | 7.0.1 | Vulnerable | Fortinet |
| cpe:2.3:a:fortinet:forticlient_endpoint_management_server:*:*:*:*:*:*:*:* | 6.2.0 – 6.2.9; 6.4.0 – 6.4.6 | Vulnerable | Fortinet |
| cpe:2.3:a:fortinet:forticlient_endpoint_management_server:7.0.0:*:*:*:*:*:*:* | 7.0.0 | Vulnerable | Fortinet |
| cpe:2.3:a:fortinet:forticlient_endpoint_management_server:7.0.1:*:*:*:*:*:*:* | 7.0.1 | Vulnerable | Fortinet |
- cpe:2.3:a:fortinet:forticlient:7.0.0:*:*:*:*:windows:*:* Versions 7.0.0 Vulnerable ·Fortinet
- cpe:2.3:a:fortinet:forticlient:7.0.1:*:*:*:*:linux:*:* Versions 7.0.1 Vulnerable ·Fortinet
- cpe:2.3:a:fortinet:forticlient:7.0.1:*:*:*:*:macos:*:* Versions 7.0.1 Vulnerable ·Fortinet
- cpe:2.3:a:fortinet:forticlient:7.0.1:*:*:*:*:windows:*:* Versions 7.0.1 Vulnerable ·Fortinet
- cpe:2.3:a:fortinet:forticlient_endpoint_management_server:*:*:*:*:*:*:*:* Versions 6.2.0 – 6.2.9; 6.4.0 – 6.4.6 Vulnerable ·Fortinet
- cpe:2.3:a:fortinet:forticlient_endpoint_management_server:7.0.0:*:*:*:*:*:*:* Versions 7.0.0 Vulnerable ·Fortinet
- cpe:2.3:a:fortinet:forticlient_endpoint_management_server:7.0.1:*:*:*:*:*:*:* Versions 7.0.1 Vulnerable ·Fortinet
Remediation
No fixed version listed by the sources yet.
Timeline
- 2026-10-02 Threatist record created from CVE-2021-41028
- 2026-10-03 Alias added: GHSA-2p93-h9hw-wqjg
References
More Fortinet Forticlient vulnerabilities
- TI-2019-13180 An unquoted service path vulnerability in the FortiClient FortiTray component of… CVSS 3.1CRITICAL 9.8
- TI-2023-24393 Code injection in Fortinet FortiClientLinux CVSS 3.1CRITICAL 9.4
- TI-2017-10335 Information disclosure in Fortinet FortiClient for Windows CVSS 3.0HIGH 8.8
- TI-2016-06998 In FortiClientWindows 5.4.1 and 5.4.2, an attacker may escalate privilege via a FortiClientNamedPipe vulnerability. CVSS 3.0HIGH 8.8
- TI-2019-03954 Untrusted search path in Fortinet FortiClientWindows CVSS 3.1HIGH 8.6
- TI-2017-05007 A privilege escalation in Fortinet FortiClient Windows 5.4.3 and earlier as well as 5.6.0… CVSS 3.0HIGH 8.1
Sources
- CVE-2021-41028 · CVE Program
- CVE-2021-41028 · NVD
- FIRST EPSS
- GHSA-2p93-h9hw-wqjg · GitHub Advisory Database · CC BY 4.0
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