CVE-2021-21087

Name: CVE-2021-21087
Creator: NVD / NIST
Published: 2021-04-15T14:15:16.077+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 5.4/10EPSS 37.09%

Last modified Jun 17, 2026

CVE-2021-21087 is a medium-severity vulnerability rated 5.4/10 on the CVSS scale. Adobe Coldfusion versions 2016 (update 16 and earlier), 2018 (update 10 and earlier) and 2021.0.0.323925 are affected by an Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability. An attacker could abuse this vulnerability to execute arbitrary JavaScript code in context of the current user. EPSS estimates a 37.09% chance of exploitation in the next 30 days.

Description

Adobe Coldfusion versions 2016 (update 16 and earlier), 2018 (update 10 and earlier) and 2021.0.0.323925 are affected by an Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability. An attacker could abuse this vulnerability to execute arbitrary JavaScript code in context of the current user. Exploitation of this issue requires user interaction.

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

37.09%

98.3th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Adobe	Coldfusion	2016
Adobe	Coldfusion	2018
Adobe	Coldfusion	2021.0.0.323925

References

https://helpx.adobe.com/security/products/coldfusion/apsb21-16.htmlPatch, Vendor Advisory
https://helpx.adobe.com/security/products/coldfusion/apsb21-16.htmlPatch, Vendor Advisory

Timeline

Published: Apr 15, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-21087?

How severe is CVE-2021-21087?

CVE-2021-21087 has a CVSS score of 5.4/10 (MEDIUM severity). The EPSS model estimates a 37.09% probability of exploitation in the next 30 days.

How do I fix CVE-2021-21087?

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-2021-21087?

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

Scan your code now

Source: NVD / NIST