CVE-2021-35223

Name: CVE-2021-35223
Creator: NVD / NIST
Published: 2021-08-31T16:15:07.75+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 8.8/10EPSS 2.94%

Last modified Jun 17, 2026

CVE-2021-35223 is a high-severity vulnerability rated 8.8/10 on the CVSS scale. 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.. EPSS estimates a 2.94% chance of exploitation in the next 30 days.

Description

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.

Metrics

CVSS 3.1

8.8/10

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

EPSS Probability

2.94%

85.4th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-20

Affected Software

Vendor	Product	Versions
Solarwinds	Serv-U	< 15.2.4

References

https://documentation.solarwinds.com/en/success_center/servu/content/release_notes/servu_15-2-4_release_notes.htmRelease Notes, Vendor Advisory
https://support.solarwinds.com/SuccessCenter/s/article/Execute-Command-Function-Allows-Remote-Code-Execution-RCE-Vulnerability-CVE-2021-35223?language=en_USVendor Advisory
https://www.solarwinds.com/trust-center/security-advisories/cve-2021-35223Vendor Advisory
https://documentation.solarwinds.com/en/success_center/servu/content/release_notes/servu_15-2-4_release_notes.htmRelease Notes, Vendor Advisory
https://support.solarwinds.com/SuccessCenter/s/article/Execute-Command-Function-Allows-Remote-Code-Execution-RCE-Vulnerability-CVE-2021-35223?language=en_USVendor Advisory
https://www.solarwinds.com/trust-center/security-advisories/cve-2021-35223Vendor Advisory

Timeline

Published: Aug 31, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-35223?

How severe is CVE-2021-35223?

CVE-2021-35223 has a CVSS score of 8.8/10 (HIGH severity). The EPSS model estimates a 2.94% probability of exploitation in the next 30 days.

How do I fix CVE-2021-35223?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-35223?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST