Zero-day vulnerability in Serv-U FTP Server

Buffer overflow
CVE-2021-35211

MicrosoftтАЩs research indicates this vulnerability exploit involves a limited, targeted set of customers and a single threat actor.

Vulnerability details

Advisory: SB2021071315 - Remote code execution in SolarWinds Serv-U

Vulnerable component: Serv-U FTP Server

CVE-ID: CVE-2021-35211

CVSSv3 score: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:H/RL:O/RC:C

CWE-ID: CWE-119 - Improper Restriction of Operations within the Bounds of a Memory Buffer

Description:

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.

External links:

https://www.solarwinds.com/trust-center/security-advisories/cve-2021-35211