# CVE-2021-35211: Serv-U Remote Memory Escape Vulnerability

> CVE-2021-35211: Serv-U Remote Memory Escape Vulnerability. CVSS 9.0 (CVSS 3.1), in CISA KEV.

Canonical: https://rewindex.com/cve/CVE-2021-35211
Last updated: 2025-10-21T23:25:40Z

- Published: 2021-07-14 20:55 UTC · Updated: 2025-10-21 23:25 UTC · Assigner: SolarWinds
- CVSS: 9.0 (CVSS 3.1) · Severity: Critical · Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H
- EPSS: 91.2%, 100th percentile (scored 2026-10-25)
- CISA KEV: yes, added 2021-11-03, federal due date 2021-11-17, ransomware use: Known

## 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.

## CISA required action

Apply updates per vendor instructions.

## Affected vendors and products

- SolarWinds: Serv-U Managed File Transfer Server and Serv-U Secured FTP

## References

- [CVE record on cve.org](https://www.cve.org/CVERecord?id=CVE-2021-35211)
- [NVD entry](https://nvd.nist.gov/vuln/detail/CVE-2021-35211)
- [https://www.microsoft.com/security/blog/2021/07/13/microsoft-discovers-threat-actor-targeting-solarwinds-serv-u-software-with-0-day-exploit](https://www.microsoft.com/security/blog/2021/07/13/microsoft-discovers-threat-actor-targeting-solarwinds-serv-u-software-with-0-day-exploit)
- [https://www.solarwinds.com/trust-center/security-advisories/cve-2021-35211](https://www.solarwinds.com/trust-center/security-advisories/cve-2021-35211)

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_Sources: CVE records from the CVE Program (cve.org). CVE® is a registered trademark of The MITRE Corporation. (https://www.cve.org/) This product uses data from the NVD API but is not endorsed or certified by the NVD. (https://nvd.nist.gov/) Known Exploited Vulnerabilities catalog from CISA. (https://www.cisa.gov/known-exploited-vulnerabilities-catalog) EPSS scores from FIRST (Exploit Prediction Scoring System). (https://www.first.org/epss/)_


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Canonical: https://rewindex.com/cve/CVE-2021-35211 · Markdown: https://rewindex.com/cve/CVE-2021-35211.md · JSON: https://rewindex.com/api/v1/cves/CVE-2021-35211 · Data licensed CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/) · Generated 2026-10-26T03:09:57.154Z