Serv-U Remote Memory Escape Vulnerability
- Published
- Last modified
- Where the record stands: published, rejected by its publisher, or superseded by another id.What do these mean? →
- published
- Whether CISA lists it in its Known Exploited Vulnerabilities catalog: proof that attackers are using it.What do these mean? →
- Listed in CISA KEV
- How many real-world setups can hit the bug, from the vendor's advisory and CISA data. It does not know your setup.What do these mean? →
- Actively exploited
- Fix
- Fixed in 15.2.3 HF1
- Whether working attack code is public (Exploit-DB, Metasploit, Nuclei or GitHub). Public code makes attacks easier.What do these mean? →
- None on Exploit-DB, Metasploit or GitHub
Summary
The vulnerability affects SolarWinds Serv-U Managed File Transfer and Serv-U Secure FTP for Windows. If exploited, an attacker could potentially execute code remotely and gain privileged access to the Windows machine hosting Serv-U.
Summarized by anthropic/claude-haiku-5.5. Verify details against the original sources.
Read the original description
Microsoft discovered a remote code execution (RCE) vulnerability in the SolarWinds Serv-U product utilizing a Remote Memory Escape Vulnerability. If exploited, a threat actor may be able to gain privileged access to the machine hosting Serv-U Only. SolarWinds Serv-U Managed File Transfer and Serv-U Secure FTP for Windows before 15.2.3 HF2 are affected by this vulnerability.
Timeline
- CVE published
- Added to CISA KEV
CISA has evidence of exploitation in the wild
- CISA remediation deadline
Due date for US federal agencies to patch
- Record last updated
- EPSS reached 10%
FIRST estimates at least a 10% chance of exploitation in the next 30 days
Affected versions
- SolarWinds Serv-U Managed File Transfer Server and Serv-U Secured FTP
From SolarWinds Serv-U · fixed in 15.2.3 HF1
References 2
Questions about CVE-2021-35211
Am I affected, and how do I check?
The listed affected products are Serv-U Managed File Transfer and Serv-U Secure FTP for Windows, through version 15.2.3 HF1 and all prior versions; Linux versions are not listed as vulnerable. The stated condition is that Serv-U's SSH service is exposed to the internet, so check the installed Serv-U version and whether its SSH service is reachable from the internet.Source: solarwinds.com, microsoft.com
What should I do about it?
The facts do not give a clear fixed release: the listed fixed version is 15.2.3 HF1, which the same facts also name as vulnerable. Confirm the fixed release against SolarWinds' advisory before deciding on an upgrade target.Source: solarwinds.com, microsoft.com
Is it being exploited?
Yes. CISA added it to its Known Exploited Vulnerabilities catalog on 2021-11-03, which means it has evidence of attacks. No public exploit code is tracked.Source: cisa.gov, cve.now feed data