CVE-2020-27155

Name: CVE-2020-27155
Creator: NVD / NIST
Published: 2020-10-22T17:15:12.52+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.5/10EPSS 1.25%

Last modified Jun 17, 2026

CVE-2020-27155 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. An issue was discovered in Octopus Deploy through 2020.4.4. If enabled, the websocket endpoint may allow an untrusted tentacle host to present itself as a trusted one.. EPSS estimates a 1.25% chance of exploitation in the next 30 days.

Description

An issue was discovered in Octopus Deploy through 2020.4.4. If enabled, the websocket endpoint may allow an untrusted tentacle host to present itself as a trusted one.

Metrics

CVSS 3.1

7.5/10

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

EPSS Probability

1.25%

65.6th percentile

Probability of exploitation in the next 30 days. Learn more

Affected Software

Vendor	Product	Versions
Octopus	Octopus Deploy	>= 3.11.13, <= 2020.4.4

References

https://github.com/OctopusDeployThird Party Advisory
https://github.com/OctopusDeploy/Issues/issues/6637Issue Tracking, Third Party Advisory
https://github.com/OctopusDeploy/Issues/issues/6639Issue Tracking, Patch, Third Party Advisory
https://github.com/OctopusDeploy/Issues/issues/6640Issue Tracking, Patch, Third Party Advisory
https://github.com/OctopusDeployThird Party Advisory
https://github.com/OctopusDeploy/Issues/issues/6637Issue Tracking, Third Party Advisory
https://github.com/OctopusDeploy/Issues/issues/6639Issue Tracking, Patch, Third Party Advisory
https://github.com/OctopusDeploy/Issues/issues/6640Issue Tracking, Patch, Third Party Advisory

Timeline

Published: Oct 22, 2020
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2020-27155?

An issue was discovered in Octopus Deploy through 2020.4.4. If enabled, the websocket endpoint may allow an untrusted tentacle host to present itself as a trusted one.

How severe is CVE-2020-27155?

CVE-2020-27155 has a CVSS score of 7.5/10 (HIGH severity). The EPSS model estimates a 1.25% probability of exploitation in the next 30 days.

How do I fix CVE-2020-27155?

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-2020-27155?

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

Scan your code now

Source: NVD / NIST