RCE in SolarWinds Serv-U Managed File Transfer and Serv-U Secure FTP
CVE-2021-35211 is a remote code execution vulnerability in SolarWinds Serv-U Managed File Transfer and Serv-U Secure FTP for Windows. The issue affects Serv-U 15.2.3 HF1 and earlier, and has been described by SolarWinds/Microsoft reporting as a remote memory escape vulnerability reachable via the SSH protocol. Public reporting indicates exploitation can trigger an exception in the SSH handling path, including log artifacts referencing "CSUSSHSocket::ProcessReceive()", after which the Serv-U process may spawn an attacker-controlled subprocess. Successful exploitation allows arbitrary command or code execution with elevated privileges on the host running Serv-U. The vulnerability was exploited in the wild by multiple threat actors, including activity attributed by Microsoft to DEV-0322 and later abuse by TA505/FIN11/Clop for initial access.
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Impact, mitigation & remediation
What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.
Impact
What an attacker gets, and what they’ve been doing with it.
Mitigation
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Remediation
Patch, then assume compromise.
Exploits
No public exploits tracked yet. Mallory keeps watching.
No public exploit code observed for this vulnerability.
Affected products & vendors
Products and vendors Mallory has correlated with this vulnerability. Open in Mallory to drill down to specific CPE configurations and version ranges.
Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
Recent activity
11 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A prior SolarWinds Serv-U vulnerability referenced as having been exploited by malicious actors (details not provided in the content).
A SolarWinds Serv-U Secure FTP remote code execution vulnerability that has been exploited by both cybercrime and state-sponsored actors, including in ransomware intrusions and zero-day attacks.
Unknown
A remote code execution vulnerability in SolarWinds Serv-U file transfer technology exploitable over SSH, enabling execution of malicious code with elevated privileges.
The version that knows your environment.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.