What’s Vulnerable › Vulnerabilities

CVE-2021-35252: Common Key Vulnerability in Serv-U FTP Server

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.6% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2022-12-16 · updated 2026-06-17
• Weakness: CWE-798

Description

Common encryption key appears to be used across all deployed instances of Serv-U FTP Server. Because of this an encrypted value that is exposed to an attacker can be simply recovered to plaintext.

Affected products

• SolarWinds Serv-U: before 15.3.2 — fixed in 15.3.2

How to fix

Upgrade to a fixed version: SolarWinds Serv-U 15.3.2. Check the vendor advisory for mitigations.

References

• https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-35252
• https://documentation.solarwinds.com/en/success_center/servu/content/release_notes/servu_15-3-2_release_notes.htm
• https://www.solarwinds.com/trust-center/security-advisories/CVE-2021-35252
• https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-35252
• https://documentation.solarwinds.com/en/success_center/servu/content/release_notes/servu_15-3-2_release_notes.htm
• https://www.solarwinds.com/trust-center/security-advisories/CVE-2021-35252

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