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Servers and applications

CVE-2021-26109

An integer overflow or wraparound vulnerability in the memory allocator of SSLVPN in FortiOS before 7.0.1 may allow an unauthenticated attacker to corrupt control data on the heap via specifically crafted requests to SSLVPN, resulting in potentially arbitrary code execution.

Severity
Critical 9.8
Published
8 Dec 2021
Last changed
17 Jun 2026
Added to UpHeron
1 Nov 2026
Sources
NVD

Affected software

SoftwareAffected versions
Fortinet FortiOSServers and applications · cpe:o:fortinet:fortios
  • From 6.0.0 up to 6.0.12
  • From 6.2.0 up to 6.2.9
  • From 6.4.0 up to 6.4.5
  • Version 7.0.0

References

  • NVD https://nvd.nist.gov/vuln/detail/CVE-2021-26109
  • CVE.org https://www.cve.org/CVERecord?id=CVE-2021-26109