CVE-2021-35223: high-severity vulnerability in SolarWinds Serv-U
Execute Command Function Allows Remote Code Execution (RCE)Vulnerability
Published · Updated
E-mail alert when it lands in KEV, gets a public PoC or its score goes up.
21Vexday Risk Score
No sign of exploitation. No public exploitation artifact known so far.
ssvc Trackcvss 8.5epss 2.9%
The Serv-U File Server allows for events such as user login failures to be audited by executing a command. This command can be supplied with parameters that can take the form of user string variables, allowing remote code execution.
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H
Affected products
SolarWinds · Serv-URelated CVEs — SolarWinds Serv-U
In the same product, most dangerous first.
CVE-2026-28318HIGHSolarWinds Serv-U Unauthenticated Denial of Service VulnerabilityEPSS 43.7%KEVCVE-2021-35247MEDIUMImproper Input Validation Vulnerability in Serv-UEPSS 3.6%KEVCVE-2021-35250HIGHDirectory Transversal Vulnerability in Serv-U 15.3EPSS 12.8%CVE-2024-45711HIGHSolarWinds Serv-U FTP Service Directory Traversal Remote Code Execution VulnerabilityEPSS 6.3%CVE-2026-28316CRITICALSolarWinds Serv-U Insecure Direct Object Reference (IDOR) VulnerabilityEPSS 2.1%CVE-2025-40549CRITICALSolarWinds Serv-U Path Restriction Bypass VulnerabilityEPSS 1.1%
References
https://documentation.solarwinds.com/en/success_center/servu/content/release_notes/servu_15-2-4_release_notes.htmhttps://support.solarwinds.com/SuccessCenter/s/article/Execute-Command-Function-Allows-Remote-Code-Execution-RCE-Vulnerability-CVE-2021-35223?language=en_UShttps://www.solarwinds.com/trust-center/security-advisories/cve-2021-35223