CVE-2020-21053

Name: CVE-2020-21053
Creator: NVD / NIST
Published: 2021-05-20T15:15:07.517+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 6.1/10EPSS 0.69%

Last modified Jun 17, 2026

CVE-2020-21053 is a medium-severity vulnerability rated 6.1/10 on the CVSS scale. Cross Site Scriptiong (XSS) vulnerability exists in FusionPBX 4.5.7 allows remote malicious users to inject arbitrary web script or HTML via an unsanitized "query_string" variable in app\devices\device_imports.php.. EPSS estimates a 0.69% chance of exploitation in the next 30 days.

Description

Cross Site Scriptiong (XSS) vulnerability exists in FusionPBX 4.5.7 allows remote malicious users to inject arbitrary web script or HTML via an unsanitized "query_string" variable in app\devices\device_imports.php.

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

0.69%

47.9th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-79

Affected Software

Vendor	Product	Versions
Fusionpbx	Fusionpbx	4.5.7

References

https://github.com/fusionpbx/fusionpbx/commit/2ce613f1e9fe8ffab7a4cb9d1384444622285335Patch, Third Party Advisory
https://resp3ctblog.wordpress.com/2019/10/28/fusionpbx-xss-22/Third Party Advisory
https://github.com/fusionpbx/fusionpbx/commit/2ce613f1e9fe8ffab7a4cb9d1384444622285335Patch, Third Party Advisory
https://resp3ctblog.wordpress.com/2019/10/28/fusionpbx-xss-22/Third Party Advisory

Timeline

Published: May 20, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2020-21053?

How severe is CVE-2020-21053?

CVE-2020-21053 has a CVSS score of 6.1/10 (MEDIUM severity). The EPSS model estimates a 0.69% probability of exploitation in the next 30 days.

How do I fix CVE-2020-21053?

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-2020-21053?

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

Scan your code now

Source: NVD / NIST