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SolarWinds Serv-U Zero-Day Vulnerability

July 12, 2021 | 1 MIN READ

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SolarWinds announced that a zero-day vulnerability exists in the Serv-U Managed File Transfer Server and Serv-U Secured FTP products and is under active exploitation by at least one threat actor group. The vulnerability is tracked as CVE-2021-35211; it is categorized as a Remote Code Execution (RCE) vulnerability, and exploitation may allow a threat actor to run arbitrary code with privileges.

SolarWinds released a hotfix to remediate the vulnerability in both Serv-U Managed File Transfer Server and Serv-U Secured FTP. Organizations are strongly recommended to apply the hotfix as soon as possible as exploitation is ongoing.

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Additional information

CVE-2021-35211 exists in Serv-U version 15.2.3 HF1 released May 5, 2021 and all prior Serv-U versions. Serv-U Managed File Transfer Server and Serv-U Secured FTP are the only impacted SolarWinds products.

SolarWinds was notified of the zero-day vulnerability by Microsoft. According to SolarWinds, “…vulnerability exploit involves a limited, targeted set of customers and a single threat actor”. No additional details on the attacks exploiting this vulnerability are publicly available at the time of writing.


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

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