UpHeron
All vulnerabilities

Servers and applications

CVE-2021-42756

Multiple stack-based buffer overflow vulnerabilities [CWE-121] in the proxy daemon of FortiWeb 5.x all versions, 6.0.7 and below, 6.1.2 and below, 6.2.6 and below, 6.3.16 and below, 6.4 all versions may allow an unauthenticated remote attacker to achieve arbitrary code execution via specifically crafted HTTP requests.

Severity
Critical 9.8
Published
16 Feb 2023
Last changed
17 Jun 2026
Added to UpHeron
1 Nov 2026
Fixed in
6.0.8, 6.1.3, 6.2.7, 6.3.17
Sources
NVD

Affected software

SoftwareAffected versions
Fortinet FortiWebServers and applications · cpe:a:fortinet:fortiweb
  • From 5.6.0 before 6.0.8
  • From 6.1.0 before 6.1.3
  • From 6.2.0 before 6.2.7
  • From 6.3.0 before 6.3.17
  • From 6.4.0 up to 6.4.2

References

  • NVD https://nvd.nist.gov/vuln/detail/CVE-2021-42756
  • CVE.org https://www.cve.org/CVERecord?id=CVE-2021-42756