What is CVE-2021-35242?

CVE-2021-35242 is a high-severity vulnerability in Solarwinds Serv-U, classified under Cross-Site Request Forgery (CSRF). CVSS score: 8.3/10. Published 2021-12-06.

How severe is CVE-2021-35242?

High severity. CVSS v3 base score is 8.3 out of 10.

CSRF in Solarwinds Serv-U

CVE-2021-35242

Serv-U server responds with valid CSRFToken when the request contains only Session.

Vulnerability class: CSRF (Cross-Site Request Forgery)

Published 2021-12-06 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 8.3 (High). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.007 (52.5th percentile), scored 2026-09-29.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 52nd percentile — 52.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.007 · newest: 0.007 · change: 0.000

Affected products

Solarwinds Serv-U
Solarwinds Serv-U Server — versions 15.2.4 Hotfix 1 and previous versions

Weakness classification (CWE)

CWE-352 — Cross-Site Request Forgery (CSRF)

References

documentation.solarwinds.com/en/success_center/servu/content/release_notes/serv… (Release Notes, Vendor Advisory)
www.solarwinds.com/trust-center/security-advisories/cve-2021-35242 (Broken Link)

Frequently asked questions

What is CVE-2021-35242?: CVE-2021-35242 is a high-severity vulnerability in Solarwinds Serv-U, classified under Cross-Site Request Forgery (CSRF). CVSS score: 8.3/10. Published 2021-12-06.
How severe is CVE-2021-35242?: High severity. CVSS v3 base score is 8.3 out of 10.