What is CVE-2021-21476?

CVE-2021-21476 is a medium-severity vulnerability in SAP Ui5, classified under URL Redirection to Untrusted Site (Open Redirect). CVSS score: 6.1/10. Published 2021-02-09.

How severe is CVE-2021-21476?

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

Open Redirect in SAP Ui5

CVE-2021-21476

SAP UI5 versions before 1.38.49, 1.52.49, 1.60.34, 1.71.31, 1.78.18, 1.84.5, 1.85.4, 1.86.1 allows an unauthenticated attacker to redirect users to a malicious site due to Reverse Tabnabbing vulnerabilities.

Vulnerability class: Open Redirect

Published 2021-02-09 · 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: 0.008 (55.4th percentile), scored 2026-09-30.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 55th percentile — 55.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.008 · newest: 0.008 · change: 0.000

Affected products

SAP Ui5
SAP Se Ui5 — versions < 1.38.49, < 1.52.49, < 1.60.34

Weakness classification (CWE)

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

References

wiki.scn.sap.com/wiki/pages/viewpage.action (Vendor Advisory)
launchpad.support.sap.com/ (Permissions Required, Third Party Advisory)

Frequently asked questions

What is CVE-2021-21476?: CVE-2021-21476 is a medium-severity vulnerability in SAP Ui5, classified under URL Redirection to Untrusted Site (Open Redirect). CVSS score: 6.1/10. Published 2021-02-09.
How severe is CVE-2021-21476?: Medium severity. CVSS v3 base score is 6.1 out of 10.