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Oct 19, 2021
Hackers Infect Employees of Law Firms, Manufacturing Companies, and Financial Services Orgs. with Increasingly Pervasive Infostealer, SolarMarker
SolarMarker Infects 5X More Corporate Victims Using Over a Million Poisoned WordPress Pages Key Takeaways eSentire has observed a fivefold increase in SolarMarker infections. Prior to September, eSentire’s Threat Response Unit (TRU) detected and shut down one infection per week. Beginning in September, TRU averaged the detection and shutdown of five per week. SolarMarker is a…
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eSentire is The Authority in Managed Detection and Response Services, protecting the critical data and applications of 1000+ organizations in 70+ countries from known and unknown cyber threats. Founded in 2001, the company’s mission is to hunt, investigate and stop cyber threats before they become business disrupting events.
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Oct 12, 2021
eSentire Launches MDR with Microsoft Azure Sentinel Extending Response Capabilities Across Entire Microsoft Security Ecosystem
Waterloo, ON – Oct. 12, 2021 -- eSentire, recognized globally as the Authority in Managed Detection and Response (MDR), today announced the expansion of its award-winning MDR services with Microsoft Azure Sentinel, as part of its integration with the complete Microsoft 365 Defender and Azure Defender product suites supporting Microsoft SIEM, endpoint, identity, email and cloud security services.…
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Security advisories — Jul 12, 2021

SolarWinds Serv-U Zero-Day Vulnerability


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.

What we’re doing about it

What you should do about it

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