# CVE-2021-35211: SolarWinds Serv-U Remote Code Execution Vulnerability

Source: https://junglewise.ai/threats/cve-2021-35211-solarwinds-serv-u-remote-code-execution-vulnerability  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2021-11-03. Updated: 2026-05-10  
License: CC BY 4.0 with a link back

CVE-2021-35211 · Severity: critical · CVSS 10 · Exploited in the wild · Published 2021-11-03

SolarWinds Serv-U Managed File Transfer and Secure FTP are vulnerable to a remote memory escape vulnerability that allows for remote code execution. An unauthenticated attacker can exploit this to gain privileged access to the host machine.

Technologies: [SolarWinds Serv-U](https://junglewise.ai/threats/technologies/serv-u). Vendors: [SolarWinds](https://junglewise.ai/threats/vendors/solarwinds).

## Quick answers

**Is CVE-2021-35211 exploited in the wild?** Yes. CVE-2021-35211 is known to be exploited in the wild, first recorded on 3 November 2021. Treat it as urgent.

**How severe is CVE-2021-35211?** Critical severity, with a CVSS score of 10, published 3 November 2021.

**Which products and versions are affected?** SolarWinds Serv-U Managed File Transfer before 15.2.3 HF2; SolarWinds Serv-U Secure FTP before 15.2.3 HF2.

**Is there a fix for CVE-2021-35211?** A patch was published on 2021-07-14: NVD Published Date and SolarWinds advisory release Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2021-35211 attacked?** It is attacked over the network, in a network appliance.

**Am I affected by CVE-2021-35211?** Check whether you run SolarWinds Serv-U. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Affected products

- SolarWinds Serv-U Managed File Transfer before 15.2.3 HF2
- SolarWinds Serv-U Secure FTP before 15.2.3 HF2

## Timeline

- 2021-07-13: disclosed: Microsoft blog post regarding discovery of threat actor targeting Serv-U with 0-day exploit
- 2021-07-14: patched: NVD Published Date and SolarWinds advisory release
- 2021-11-03: kev added: Added to CISA Known Exploited Vulnerabilities Catalog

## Related threats

- [SolarWinds Serv-U broken access control privilege escalation](https://junglewise.ai/threats/cve-2026-28321-solarwinds-serv-u-broken-access-control-privilege-escalation)
- [SolarWinds Serv-U privilege escalation via IDOR](https://junglewise.ai/threats/cve-2026-28317-solarwinds-serv-u-privilege-escalation-via-idor)
- [SolarWinds Serv-U IDOR privilege escalation to root](https://junglewise.ai/threats/cve-2026-28316-solarwinds-serv-u-idor-privilege-escalation-to-root)
- [SolarWinds Serv-U stored XSS in administrator interface](https://junglewise.ai/threats/cve-2026-28315-solarwinds-serv-u-stored-xss-in-administrator-interface)
- [SolarWinds Serv-U account takeover via IDOR](https://junglewise.ai/threats/cve-2026-28314-solarwinds-serv-u-account-takeover-via-idor)