VulnTideExploited vulnerabilities, by vendor. Data as of .
Not in CISA KEVReported exploited: VulnCheck KEV since Published CVSS 7.5 highEPSS 12.8% probability of exploitation in 30 days
SolarWinds

CVE-2021-35250: Directory Transversal Vulnerability in Serv-U 15.3

Is it exploited?

Reported, not confirmed by CISA. VulnCheck KEV lists it as exploited in the wild. CISA has not added it to its Known Exploited Vulnerabilities catalog as of .

VulnCheck KEV lists it since . It cites 483 public reports, the first from .

How likely is exploitation in the next 30 days?
12.8%

EPSS score, percentile 96.3 of all scored records. A probability estimated by FIRST, not a report of exploitation.

How severe?
7.5 High

CVSS v3.1 base score, given by the CNA

What should I do?

SolarWinds advises to upgrade to the latest version of Web Help Desk (Serv-U 15.3 HF1)Solution from the CVE record.

CISA has set no required action, because the vulnerability is not in KEV.

The CVE record links no vendor advisory, patch or mitigation.

Which versions are affected?

Affected

  • from 15.3 only to before 15.3 Hotfix 1

Versions by product

Source: CISA KEV 2026.10.29, as of ; VulnCheck KEV, as of ; FIRST EPSS, as of ; CVE List, as of . About the data.

Description

Directory Transversal Vulnerability in Serv-U 15.3

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.

Source: CVE List, as of . About the data.

What to do

Advisories and patches

The CVE record links no vendor advisory, patch or mitigation.

This summary is based on the CVE record as of . Check the vendor's advisory before you act: affected versions and fixes can change.

Affected products and versions

Versions by product, as listed in the CVE record (1 product)
SolarWinds Serv-U
StatusVersions
Affectedfrom 15.3 only to before 15.3 Hotfix 1

Versions not listed are: unaffected.

Source: CVE List, as of . About the data.

Weakness

CWE-22
  • CWE-22: File and Directory Information Exposure

CWE and CAPEC are maintained by MITRE; the entries are those named in the CVE record.

Timeline

DateEvent
CVE record published
CVE record last updated

References

2

Known exploited SolarWinds vulnerabilities

  • CVE-2026-28318: SolarWinds Serv-U Uncontrolled Resource Consumption Vulnerability (added )
  • CVE-2025-26399: SolarWinds Web Help Desk Deserialization of Untrusted Data Vulnerability (added )
  • CVE-2025-40536: SolarWinds Web Help Desk Security Control Bypass Vulnerability (added )
  • CVE-2025-40551: SolarWinds Web Help Desk Deserialization of Untrusted Data Vulnerability (added )
  • CVE-2024-28987: SolarWinds Web Help Desk Hardcoded Credential Vulnerability (added )