Stack-based buffer overflow in FortiWeb - CVE-2021-42756
Published: December 29, 2023
Vulnerability identifier: #VU84879
CSH Severity: High
CVSS v4: 9.3 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2021-42756
CWE-ID: CWE-121
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to execute arbitrary code on the target system.
The vulnerability exists due to a boundary error in the proxy daemon. A remote unauthenticated attacker can send a specially crafted HTTP request to the system, trigger a stack-based buffer overflow and execute arbitrary code on the target system.
Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.
Affected software
FortiWeb
How to mitigate CVE-2021-42756
Install updates from vendor's website.
FortiWeb - addressed in versions 6.0.8, 6.1.3, 6.2.7, 6.3.17, 7.0.0