CVE-2021-43074An improper verification of cryptographic signature vulnerability [CWE-347] in FortiWeb 6.4 all versions, 6.3.16 and below, 6.2 all…
- 4.1MediumCVSS base score
- 0.29%Exploitation in 30 daysEPSS · top 78% of all CVEs
- NoKnown exploitednot in CISA's KEV catalog
- NonePublic exploitsnone known yet
Description
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.
Timeline
ID reserved
By fortinet
- 16 months later
· 16 months later
Published
- 20 months later
· 20 months later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| fortinetCNA (assigner) | 3.1 | Medium4.1 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N/E:P/RL:U/RC:C |
| NVDNVD · Modified | 3.1 | Medium4.3 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N |
- EPSS (exploitation in 30 days)
- 0.29% · top 78% of all CVEs (13 Nov 2026)
- CISA SSVC
- Exploitation: none · Automatable: no · Technical impact: partial
The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 4.1.
Affected products
- affected 7.0.0 – ≤ 7.0.3
- affected 6.4.0 – ≤ 6.4.10
- affected 6.2.0 – ≤ 6.2.7
- affected 6.0.0 – ≤ 6.0.7
- affected 6.4.0 – ≤ 6.4.2
- affected 6.3.0 – ≤ 6.3.16
- affected 6.2.0 – ≤ 6.2.7
- affected 6.1.0 – ≤ 6.1.3
- affected 6.0.0 – ≤ 6.0.8
- affected 7.0.0 – ≤ 7.0.1
- affected 2.0.0 – ≤ 2.0.7
- affected 1.2.0 – ≤ 1.2.13
- affected 1.1.0 – ≤ 1.1.6
- affected 1.0.0 – ≤ 1.0.7
- affected 7.0.0 – ≤ 7.0.3
- affected 6.4.0 – ≤ 6.4.8
- affected 6.2.0 – ≤ 6.2.12
- affected 6.0.0 – ≤ 6.0.16
What to do
Solution: Upgrade to FortiOS version 7.0.7 or above. Upgrade to FortiOS version 6.4.9 or above. Upgrade to FortiWeb version 7.0.0 or above. upgrade to FortiWeb version 6.3.17 or above. Upgrade to FortiProxy version 7.0.7 or above. Upgrade to FortiProxy version 2.0.8 or above. Upgrade to FortiSwitch version 7.2.0 or above. Upgrade to FortiSwitch version 7.0.4 or above. Upgrade to FortiSwitch version 6.4.11 or above.
References
References1
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- EUVD EUVD-2021-30027 (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://cveledger.app/cve/CVE-2021-43074)Record last updated .