What is CVE-2021-25179?

CVE-2021-25179 is a medium-severity vulnerability in Solarwinds Serv-U File Server, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2021-05-05.

How severe is CVE-2021-25179?

Medium severity. CVSS v3 base score is 6.1 out of 10.

XSS in Solarwinds Serv-U File Server

CVE-2021-25179

SolarWinds Serv-U before 15.2 is affected by Cross Site Scripting (XSS) via the HTTP Host header.

Vulnerability class: XSS (Cross-Site Scripting)

Published 2021-05-05 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 6.1 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N.

EPSS exploit prediction

EPSS: 0.014 (71.3th percentile), scored 2026-09-29.

Low probability of exploitation in the next 30 days, but still tracked. 71st percentile — 71.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.014 · newest: 0.014 · change: 0.000

Affected products

Solarwinds Serv-U File Server

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

www.linkedin.com/in/gabrielegristina (Permissions Required, Third Party Advisory)
twitter.com/gm4tr1x (Third Party Advisory)
github.com/matrix (Third Party Advisory, Not Applicable)
documentation.solarwinds.com/en/success_center/servu/content/release_notes/serv… (Release Notes, Vendor Advisory)

Frequently asked questions

What is CVE-2021-25179?: CVE-2021-25179 is a medium-severity vulnerability in Solarwinds Serv-U File Server, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2021-05-05.
How severe is CVE-2021-25179?: Medium severity. CVSS v3 base score is 6.1 out of 10.