CVE-2020-4020

Name: CVE-2020-4020
Creator: NVD / NIST
Published: 2020-06-01T07:15:11.063+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.2/10EPSS 1.67%

Last modified Jun 17, 2026

CVE-2020-4020 is a high-severity vulnerability rated 7.2/10 on the CVSS scale. The file downloading functionality in the Atlassian Companion App before version 1.0.0 allows remote attackers, who control a Confluence Server instance that the Companion App is connected to, execute arbitrary .exe files via a Protection Mechanism Failure.. EPSS estimates a 1.67% chance of exploitation in the next 30 days.

Description

The file downloading functionality in the Atlassian Companion App before version 1.0.0 allows remote attackers, who control a Confluence Server instance that the Companion App is connected to, execute arbitrary .exe files via a Protection Mechanism Failure.

Metrics

CVSS 3.1

7.2/10

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

EPSS Probability

1.67%

73.8th percentile

Probability of exploitation in the next 30 days. Learn more

Affected Software

Vendor	Product	Versions
Atlassian	Companion	< 1.0.0

References

https://jira.atlassian.com/browse/CONFSERVER-59733Vendor Advisory
https://jira.atlassian.com/browse/CONFSERVER-59733Vendor Advisory

Timeline

Published: Jun 1, 2020
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2020-4020?

How severe is CVE-2020-4020?

CVE-2020-4020 has a CVSS score of 7.2/10 (HIGH severity). The EPSS model estimates a 1.67% probability of exploitation in the next 30 days.

How do I fix CVE-2020-4020?

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-2020-4020?

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

Scan your code now

Source: NVD / NIST