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Findings

CVE-2021-35211

SolarWinds Serv-U Remote Code Execution Vulnerability

Published Jul 14, 2021 · updated Jun 16, 2026 · solarwinds serv-u

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

Detection, updates, and resolution for this record.

  1. Jul 14, 2021 · Catalog

    Detected

    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.

  2. Nov 3, 2021 · CISA KEV

    Known exploited

    Apply updates per vendor instructions.

  3. Nov 17, 2021 · CISA KEV

    Remediation due

    Apply updates per vendor instructions.

  4. Jun 16, 2026 · Catalog

    Updated

    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.

Required action

Apply updates per vendor instructions.

CISA due date Nov 17, 2021

Affected

  • cpe solarwinds/serv-uversion unspecified
  • cpe solarwinds/serv-u15.2.3
  • vendor SolarWinds Serv-Uversion unspecified

Sources

  • CISA KEVCVE-2021-35211

    SolarWinds Serv-U contains an unspecified memory escape vulnerability which can allow for remote code execution.

    cisa.gov
  • CVE.orgCVE-2021-35211

    Official CVE identifier

    cve.org
  • FIRST EPSSCVE-2021-35211

    30-day exploitation probability 91.2%

    first.org
  • NIST NVDCVE-2021-35211

    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

    nvd.nist.gov

References

CVE-2021-35211 · ZeroDay Findings