Buffer overflow in Serv-U FTP Server - CVE-2021-35211
Published: July 13, 2021 / Updated: January 16, 2022
Vulnerability identifier: #VU54677
CSH Severity: Critical
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-2021-35211
CWE-ID: CWE-119
Exploitation vector: Remote access
Exploit availability:
The vulnerability is being exploited in the wild
Vulnerability details
The vulnerability allows a remote attacker to execute arbitrary code on the target system.
The vulnerability exists due to a boundary error. A remote attacker can send a specially crafted request to the Serv-U server, trigger memory corruption and execute arbitrary code on the target system.
Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.
Note, the vulnerability is being actively exploited in the wild.
Affected software
Serv-U FTP Server
How to mitigate CVE-2021-35211
Install updates from vendor's website.
Serv-U FTP Server - update to 15.2.3 HF2