What is CVE-2021-33331?

CVE-2021-33331 is a medium-severity vulnerability in Liferay Digital Experience Platform, classified under URL Redirection to Untrusted Site (Open Redirect). CVSS score: 6.1/10. Published 2021-08-03.

How severe is CVE-2021-33331?

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

Open Redirect in Liferay Digital Experience Platform

CVE-2021-33331

Open redirect vulnerability in the Notifications module in Liferay Portal 7.0.0 through 7.3.1, and Liferay DXP 7.0 before fix pack 94, 7.1 before fix pack 19 and 7.2 before fix pack 8, allows remote attackers to redirect users to arbitrary external URLs via the 'redirect' parameter.

Vulnerability class: Open Redirect

Published 2021-08-03 · 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: 0.010 (60.7th percentile), scored 2026-10-01.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 61st percentile — 60.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.010 · newest: 0.010 · change: 0.000

Affected products

Liferay Digital Experience Platform — versions 7.0, 7.1, 7.2
Liferay Portal

Weakness classification (CWE)

CWE-601 — URL Redirection to Untrusted Site (Open Redirect)

References

portal.liferay.dev/learn/security/known-vulnerabilities/-/asset_publisher/HbL5m… (Release Notes, Vendor Advisory)
issues.liferay.com/browse/LPE-17022 (Patch, Vendor Advisory)

Frequently asked questions

What is CVE-2021-33331?: CVE-2021-33331 is a medium-severity vulnerability in Liferay Digital Experience Platform, classified under URL Redirection to Untrusted Site (Open Redirect). CVSS score: 6.1/10. Published 2021-08-03.
How severe is CVE-2021-33331?: Medium severity. CVSS v3 base score is 6.1 out of 10.