Security Advisory 2021-07

Summary Proxy Password Stored in Plaintext (CVE-2021-31820)
Advisory Number 2021-07
Discovery Date 16 Jul 2021
Patch Release Date 03 Aug 2021
Advisory Release Date 18 Aug 2021
Product Octopus Server
Operating System Linux and Windows
Severity Medium
CVE ID CVE-2021-31820

Customers who have downloaded and installed any of the Octopus Server versions listed below ("Details") are affected.

Please upgrade your Octopus Server immediately to fix this vulnerability.

Customers who have upgraded Octopus Server to version 2021.1.7622 or higher are not affected.


Octopus Deploy has given this vulnerability a medium rating. This rating was given according to the Octopus Deploy severity levels, which ranks vulnerabilities as critical, high, medium, or low severity.

This is our assessment and you should evaluate its applicability to your own environment.


In Octopus Server after version 2018.8.2 if the Octopus Server Web Request Proxy is configured with authentication, the password is shown in plaintext in the UI.

The versions of Octopus Server affected by this vulnerability are:

  • All 2018.x.x versions after 2018.8.2

  • All 2019.x.x, 2020.1.x, 2020.2.x, 2020.3.x, 2020.4.x, 2020.5.x versions

  • All 2020.6.x versions before 2020.6.5310

  • All 2021.1.x versions before 2021.1.7622


To address this vulnerability, we have released Octopus Server versions:

  • 2020.6.5310

  • 2021.1.7622

The latest versions of Octopus Deploy products can be downloaded from and previous versions can be downloaded from

What You Need to Do

Octopus Deploy recommends that you upgrade to the latest version (2021.1.7622). You can download the latest version of from

If you can't upgrade to the latest version (2021.1.7622):

If you have feature version... ...then upgrade to this version
2018.8.x, 2019.x.x, 2020.1.x, 2020.2.x, 2020.3.x, 2020.4.x, 2020.5.x, 2020.6.x 2020.6.5310
2021.1.x 2021.1.7622


There is no known mitigation for CVE-2021-31820, it is important to upgrade to a fixed version as soon as possible.


If you have any questions or concerns regarding this advisory, please contact our support team

Exploitation and Public Announcements

The Octopus Deploy security team is not aware of any public announcements or malicious use of the vulnerability that is described in this advisory.


This vulnerability was found by an Octopus Deploy customer.