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Octopus Deploy CVE-2020-27155

HIGH
2020-10-22 cve@mitre.org
7.5
CVSS 3.1 · NVD
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Vulnerability Assessment

Impact

CVSS score of 7.5 (HIGH). Attack characteristics: network attack vector, low complexity, no privileges required, no user interaction not required.

Exploit ScenarioDerived

This vulnerability can be exploited remotely over the network. Successful exploitation could compromise the high-severity affected system.

This Week Schedule remediation this week. Why: HIGH severity (CVSS 7.0-8.9).
Patch available 1.3% exploitation probability (EPSS)

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AnalysisAI

An issue was discovered in Octopus Deploy through 2020.4.4. Rated high severity (CVSS 7.5), this vulnerability is remotely exploitable, no authentication required, low attack complexity.

RemediationAI

A vendor patch is available. Apply the latest security update as soon as possible. Apply vendor patches when available. Implement network segmentation and monitoring as interim mitigations.

Affects your stack

Find out whether the stacks and servers you run are on an affected version.

Checking this CVE against your own stacks and servers is part of the Basic plan and up.

Technical ContextAI · show details

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. Affected products include: Octopus Octopus Deploy. Version information: through 2020.4.4..

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  • Exploit and PoC references, threat intelligence from 22 sources

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Severity by source

NVD PRIMARY 7.5 HIGH
AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
High
Availability
None

DescriptionNVD

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.

Threat Intelligence Overview

EPSS Score
1.3%
Top 34% exploitable
Data Quality
3 sources
Confidence: Low

How this decision was reached

The engine reads each signal below and applies a fixed list of rules from top to bottom. The first rule that matches sets the recommended action – like a statement, every line is shown.

SignalValue
Severity HIGH
CISA KEV No
Public POC No
EPSS 1.3%
Patch available Yes
Active threat No
Deciding rule
HIGH severity (CVSS 7.0-8.9)
What every action level means
Emergency Immediate action required. Criteria: CRITICAL + in CISA KEV (actively exploited) without patch, OR CRITICAL + EPSS > 30% without patch, OR CRITICAL + active threat signals without patch.
Act Now Prioritize within 24-48h. Criteria: in KEV with patch available, OR CRITICAL + public POC, OR HIGH + EPSS > 10%, OR CRITICAL + active threat, OR any CRITICAL severity.
This Week Schedule remediation this week. Criteria: HIGH severity (CVSS 7.0-8.9). Patch within normal change window.
This Month Plan within 30 days. Criteria: MEDIUM severity (CVSS 4.0-6.9), lower exploitation probability. Include in regular patch cycle.
Monitor Track and reassess. Criteria: LOW severity (CVSS 0.1-3.9), minimal exploitation risk. No immediate action needed.

SSVC AssessmentENISA

SSVC Decision· derived
Scheduled
Exploitation· derived
None
System Exposure· derived
Open
Automatable· derived
Yes
Human Impact· derived
Medium

Priority Score

39
Low Medium High Critical
KEV: 0
EPSS: +1
CVSS: +38
PoC: 0
Weaponized: 0
Threat intel: 0
Gov advisory: 0

Attack Technique

Information disclosure occurs when an application unintentionally exposes sensitive data that aids attackers in reconnaissance or directly compromises security.

Affected Products (CPE)NVD

cpe:2.3:a:octopus:octopus_deploy:*:*:*:*:*:*:*:*
CVE-2019-11632 HIGH POC
8.1 May 01

In Octopus Deploy 2019.1.0 through 2019.3.1 and 2019.4.0 through 2019.4.5, an authenticated user with the VariableViewUn

CVE-2018-9039 MEDIUM POC
6.5 Mar 27

In Octopus Deploy 2.0 and later before 2018.3.7, an authenticated user, with variable edit permissions, can scope some v

CVE-2026-4881 MEDIUM POC
6.0 Jun 04

Server-level configuration changes can be made by any authenticated low-privilege user in Octopus Server through a speci

CVE-2017-16810 MEDIUM POC
5.4 Nov 14

Cross-site scripting (XSS) vulnerability in the All Variables tab in Octopus Deploy 3.4.0-3.13.6 (fixed in 3.13.7) allow

CVE-2018-10581 MEDIUM POC
5.4 May 01

In Octopus Deploy 3.4.x before 2018.4.7, an authenticated user is able to view/update/save variable values within the Te

CVE-2017-17665 HIGH
8.8 Dec 13

In Octopus Deploy before 4.1.3, the machine update process doesn't check that the user has access to all environments. R

CVE-2026-92355 HIGH
8.7 Sep 16

Path traversal in Octopus Server allows an authenticated low-privilege user to overwrite arbitrary files on the server f

CVE-2020-10678 HIGH
8.8 Mar 19

In Octopus Deploy before 2020.1.5, for customers running on-premises Active Directory linked to their Octopus server, an

CVE-2018-5706 HIGH
8.8 Jan 16

An issue was discovered in Octopus Deploy before 4.1.9. Rated high severity (CVSS 8.8), this vulnerability is remotely e

CVE-2018-4862 HIGH
8.8 Jan 03

In Octopus Deploy versions 3.2.11 - 4.1.5 (fixed in 4.1.6), an authenticated user with ProcessEdit permission could refe

CVE-2026-101169 HIGH
8.7 Sep 29

Authenticated remote code execution in Octopus Server allows any user whose role grants permission to edit an Environmen

CVE-2026-102478 HIGH
8.7 Oct 07

Privilege escalation in Octopus Server lets an authenticated user who already holds permission to modify roles weaken a

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