CVE-2021-33853

Name: CVE-2021-33853
Creator: NVD / NIST
Published: 2022-03-16T15:15:10.217+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 5.4/10EPSS 0.57%

Last modified Jun 17, 2026

CVE-2021-33853 is a medium-severity vulnerability rated 5.4/10 on the CVSS scale. A Cross-Site Scripting (XSS) attack can cause arbitrary code (javascript) to run in a user’s browser while the browser is connected to a trusted website. As the vehicle for the attack, the application targets the users and not the application itself. EPSS estimates a 0.57% chance of exploitation in the next 30 days.

Description

A Cross-Site Scripting (XSS) attack can cause arbitrary code (javascript) to run in a user’s browser while the browser is connected to a trusted website. As the vehicle for the attack, the application targets the users and not the application itself. Additionally, the XSS payload is executed when the user attempts to access any page of the CRM.

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

0.57%

42.7th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
X2engine	X2crm	8.0

References

https://cybersecurityworks.com/zerodays/cve-2021-33853-stored-cross-site-scripting-in-x2crm.htmlExploit, Third Party Advisory
https://cybersecurityworks.com/zerodays/cve-2021-33853-stored-cross-site-scripting-in-x2crm.htmlExploit, Third Party Advisory

Timeline

Published: Mar 16, 2022
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-33853?

How severe is CVE-2021-33853?

CVE-2021-33853 has a CVSS score of 5.4/10 (MEDIUM severity). The EPSS model estimates a 0.57% probability of exploitation in the next 30 days.

How do I fix CVE-2021-33853?

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-2021-33853?

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

Scan your code now

Source: NVD / NIST