RCE in SolarWinds Serv-U Managed File Transfer and 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 before 15.2.3 HF2. Microsoft discovered the flaw and SolarWinds described it as a remote memory escape vulnerability. The issue is exploitable via the SSH protocol and affects deployments where the vulnerable Serv-U SSH functionality is exposed. Reporting cited in the content indicates exploitation can cause the Serv-U process to spawn an attacker-controlled subprocess, enabling execution of malicious commands with elevated privileges on the host running Serv-U. Observed exploitation artifacts include Serv-U log exceptions such as "EXCEPTION: C0000005; CSUSSHSocket::ProcessReceive();".
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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
If you can’t patch tonight, do this now.
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
13 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A remote code execution vulnerability in SolarWinds Serv-U that was exploited as a zero-day for espionage and later by the Cl0p ransomware group.
A SolarWinds Serv-U remote code execution vulnerability that was exploited by both ransomware operators and a named threat actor in attacks against corporate networks.
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.
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.