CVE-2020-17021

Name: CVE-2020-17021
Creator: NVD / NIST
Published: 2020-11-11T07:15:14.84+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 5.4/10EPSS 1.33%

Last modified Jun 17, 2026

CVE-2020-17021 is a medium-severity vulnerability rated 5.4/10 on the CVSS scale. Microsoft Dynamics 365 (on-premises) Cross-site Scripting Vulnerability. EPSS estimates a 1.33% chance of exploitation in the next 30 days.

Description

Microsoft Dynamics 365 (on-premises) Cross-site Scripting Vulnerability

Metrics

CVSS 3.1

5.4/10

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

EPSS Probability

1.33%

67.4th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-79

Affected Software

Vendor	Product	Versions
Microsoft	Dynamics 365	9.0

References

https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2020-17021Patch, Vendor Advisory
https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2020-17021Patch, Vendor Advisory

Timeline

Published: Nov 11, 2020
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2020-17021?

Microsoft Dynamics 365 (on-premises) Cross-site Scripting Vulnerability

How severe is CVE-2020-17021?

CVE-2020-17021 has a CVSS score of 5.4/10 (MEDIUM severity). The EPSS model estimates a 1.33% probability of exploitation in the next 30 days.

How do I fix CVE-2020-17021?

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-2020-17021?

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

Scan your code now

Source: NVD / NIST