What is CVE-2020-15543?

CVE-2020-15543 is a critical-severity vulnerability in Solarwinds Serv-U FTP Server, classified under Improper Input Validation. CVSS score: 9.8/10. Published 2020-07-05.

How severe is CVE-2020-15543?

Critical severity. CVSS v3 base score is 9.8 out of 10.

Improper input validation in Solarwinds Serv-U FTP Server

CVE-2020-15543

SolarWinds Serv-U FTP server before 15.2.1 does not validate an argument path.

Vulnerability class: Drupalgeddon 2 (CVE-2018-7600)

Published 2020-07-05 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.016 (75.3th percentile), scored 2026-09-29.

Low probability of exploitation in the next 30 days, but still tracked. 75th percentile — 75.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.016 · newest: 0.016 · change: 0.000

Affected products

Solarwinds Serv-U FTP Server

Weakness classification (CWE)

CWE-20 — Improper Input Validation

References

documentation.solarwinds.com/en/success_center/servu/Content/Release_Notes/Serv… (Release Notes, Vendor Advisory)

Frequently asked questions

What is CVE-2020-15543?: CVE-2020-15543 is a critical-severity vulnerability in Solarwinds Serv-U FTP Server, classified under Improper Input Validation. CVSS score: 9.8/10. Published 2020-07-05.
How severe is CVE-2020-15543?: Critical severity. CVSS v3 base score is 9.8 out of 10.