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Vulnerabilities

Vulnerability · CVE-2021-35250

SolarWinds Serv-U Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')

Published Dec 24, 2023 · catalog updated Dec 24, 2023 · SolarWinds Serv-U

Patch now

CVE-2021-35250 is in the CISA known-exploited catalog. Confirm SolarWinds Serv-U against the vendor advisory and apply that fix. The CVSS score does not change the priority.

Gaps on this record

  • No version range is stored. A customer cannot check an installed version against this record.
Severity
Unknown—
Known exploitation
CISA KEV and VulnCheck KEV
EPSS
12.80%
Remediation
Remediation guidance
Affected products
vendor SolarWinds Serv-U

A researcher reported a Directory Transversal Vulnerability in Serv-U 15.3. This may allow access to files relating to the Serv-U installation and server files. This issue has been resolved in Serv-U 15.3 Hotfix 1.

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.

  • vendor SolarWinds Serv-Uversion unspecified

How to fix CVE-2021-35250

What to do

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

Should you patch?

CVE-2021-35250 is in the CISA known-exploited catalog. Confirm SolarWinds Serv-U against the vendor advisory and apply that fix. The CVSS score does not change the priority.

Which versions are affected?

Affected version ranges are not on this record. Apply remediations or mitigations per vendor instructions or discontinue use of the product if remediation or mitigations are unavailable.

What should an analyst verify?

No weakness class is stored. EPSS 12.80%. 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. Dec 24, 2023 · VulnCheck KEV

    Detected

    A researcher reported a Directory Transversal Vulnerability in Serv-U 15.3. This may allow access to files relating to the Serv-U installation and server files. This issue has been resolved in Serv-U 15.3 Hotfix 1.

  2. Dec 24, 2023 · CISA KEV

    Known exploited

    Apply remediations or mitigations per vendor instructions or discontinue use of the product if remediation or mitigations are unavailable.

Sources

  • CVE.orgVulnerability recordCVE-2021-35250

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2021-35250

    30-day exploitation probability 12.8%

    first.org
  • VulnCheck KEVConfirmed exploitationCVE-2021-35250

    A researcher reported a Directory Transversal Vulnerability in Serv-U 15.3. This may allow access to files relating to the Serv-U installation and server files. This issue has been resolved in Serv-U 15.3 Hotfix 1.

    vulncheck.com

References

Freshness

Last verified in this catalog Oct 18, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.