High severity · published Feb 2, 2022
CVE-2021-36193
Multiple stack-based buffer overflows in the command line interpreter of FortiWeb before 6.4.2 may allow an authenticated attacker to achieve arbitrary code execution via…
7.2
CVSS
0.8%
EPSS
No
On KEV
Description
Multiple stack-based buffer overflows in the command line interpreter of FortiWeb before 6.4.2 may allow an authenticated attacker to achieve arbitrary code execution via specially crafted commands.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
Attack vector
Network
Complexity
Low
Privileges
High
User interaction
None
Confidentiality
High
Integrity
High
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.8% · higher than 57% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
FO
Fortiweb · Fortinet
5.0.0 before 6.2.6; 6.3.0 before 6.3.16; 6.4.0 before 6.4.2 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2021-36193
CVE.org
https://www.cve.org/CVERecord?id=CVE-2021-36193
Vendor Advisory
https://fortiguard.com/advisory/FG-IR-21-132
More from Fortiweb
9.8
CVE-2026-24858
Fortinet Multiple Products Authentication Bypass Using an Alternate Path or Channel Vulnerability
9.8
CVE-2025-64446
Fortinet FortiWeb Path Traversal Vulnerability
9.8
CVE-2025-25257
Fortinet FortiWeb SQL Injection Vulnerability
7.2
CVE-2025-58034
Fortinet FortiWeb OS Command Injection Vulnerability
9.8
CVE-2026-26035
An Improper Authentication vulnerability [CWE-287] vulnerability in Fortinet FortiWeb 8.0.0 through 8.0.2, FortiWeb 7.6.0 through 7.6.6, FortiWeb 7.4.0 through 7.4.11, FortiWeb…