CVE-2021-21491

Name: CVE-2021-21491
Creator: NVD / NIST
Published: 2021-03-10T15:15:12.82+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 6.1/10EPSS 0.67%

Last modified Jun 17, 2026

CVE-2021-21491 is a medium-severity vulnerability rated 6.1/10 on the CVSS scale. SAP Netweaver Application Server Java (Applications based on WebDynpro Java) versions 7.00, 7.10, 7.11, 7.20, 7.30, 7.31, 7.40, 7.50, allow an attacker to redirect users to a malicious site due to Reverse Tabnabbing vulnerabilities.. EPSS estimates a 0.67% chance of exploitation in the next 30 days.

Description

SAP Netweaver Application Server Java (Applications based on WebDynpro Java) versions 7.00, 7.10, 7.11, 7.20, 7.30, 7.31, 7.40, 7.50, allow an attacker to redirect users to a malicious site due to Reverse Tabnabbing vulnerabilities.

Metrics

CVSS 3.1

6.1/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

EPSS Probability

0.67%

47.1th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-601

Affected Software

Vendor	Product	Versions
Sap	Netweaver Application Server Java	7.00
Sap	Netweaver Application Server Java	7.10
Sap	Netweaver Application Server Java	7.11
Sap	Netweaver Application Server Java	7.20
Sap	Netweaver Application Server Java	7.30
Sap	Netweaver Application Server Java	7.31
Sap	Netweaver Application Server Java	7.40
Sap	Netweaver Application Server Java	7.50

References

https://launchpad.support.sap.com/#/notes/2976947Permissions Required, Vendor Advisory
https://wiki.scn.sap.com/wiki/pages/viewpage.action?pageId=571343107Vendor Advisory
https://launchpad.support.sap.com/#/notes/2976947Permissions Required, Vendor Advisory
https://wiki.scn.sap.com/wiki/pages/viewpage.action?pageId=571343107Vendor Advisory

Timeline

Published: Mar 10, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-21491?

How severe is CVE-2021-21491?

CVE-2021-21491 has a CVSS score of 6.1/10 (MEDIUM severity). The EPSS model estimates a 0.67% probability of exploitation in the next 30 days.

How do I fix CVE-2021-21491?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-21491?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST