CVE-2021-43074
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.
Key facts
- CVSS score
- 4.3 (v3.1)
- Severity
- MEDIUM
- CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N- Weakness (CWE)
- CWE-347
- EPSS score
- 0.3% (20th percentile)
- In CISA KEV
- No
- In EU EUVD
- Yes (EUVD-2021-30027)
- Published
- February 16, 2023
- NVD last modified
- June 17, 2026
- Status
- Modified
EU Vulnerability Database (EUVD)
This vulnerability is also tracked by ENISA as EUVD-2021-30027 in the EU Vulnerability Database. Last updated in EUVD on October 22, 2024.
View on the EU Vulnerability DatabaseAffected products
- fortinet / fortios
- fortinet / fortiproxy
- fortinet / fortiswitch
- fortinet / fortiweb
Certified products that may be affected
3 FIPS 140 or Common Criteria certified products, from automated matching by sec-certs.org.
- FortiGate/FortiOS Version 6.2.7 - Fortinet, Inc. - Common Criteria 559-LSS - archived
- FortiProxy-400E/2000E/4000E - Fortinet, Inc. - FIPS 140 3628 - historical
- Fortinet FortiProxy v1.0 - Fortinet, Inc. - Common Criteria 383-4-475 - archived
References
- https://fortiguard.com/psirt/FG-IR-21-126(Vendor Advisory)
Last updated September 17, 2026 · Source: NVD, CISA KEV, FIRST.org EPSS
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