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Vulnerabilities

Vulnerability · CVE-2021-35211

SolarWinds Serv-U Remote Code Execution Vulnerability

Published Jul 13, 2021 · catalog updated Jun 16, 2026 · SolarWinds Serv-U

Patch now

CVE-2021-35211 is in the CISA known-exploited catalog, due Nov 17, 2021. Confirm SolarWinds Serv-U against the vendor advisory and apply that fix. The CVSS score does not change the priority.

Severity
Critical10.0
Known exploitation
CISA KEV and VulnCheck KEV
EPSS
91.16%
Remediation
Remediation guidance
Affected products
cpe solarwinds/serv-u · vendor 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.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

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

How to fix CVE-2021-35211

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

CVE-2021-35211 is in the CISA known-exploited catalog, due Nov 17, 2021. Confirm SolarWinds Serv-U against the vendor advisory and apply that fix. The CVSS score does not change the priority.

Which versions are affected?

Compare what you have installed with 15.2.3. Apply updates per vendor instructions.

What should an analyst verify?

CWE-787: Out-of-bounds Write. EPSS 91.16%. The CISA KEV listing is the exploitation evidence. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Code

The project this record applies to. Exploit listings stay in References.

No public source repository is identified for this product.

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.

Sources

  • CISA KEVConfirmed exploitationCVE-2021-35211

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

    cisa.gov
  • CVE.orgVulnerability recordCVE-2021-35211

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2021-35211

    30-day exploitation probability 91.2%

    first.org
  • NIST NVDVulnerability recordCVE-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
  • VulnCheck KEVConfirmed exploitationCVE-2021-35211

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

    vulncheck.com

References

Freshness

Last verified in this catalog Oct 17, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.