CVE-2021-26556

HIGH

Octopus Deploy 0.9-2020.4.229 and Octopus Server 2020.5.0-2020.5.256 - Untrusted Search Path via DLL Side-Loading

Title source: llm

Description

When Octopus Server is installed using a custom folder location, folder ACLs are not set correctly and could lead to an unprivileged user using DLL side-loading to gain privileged access.

References (1)

Core 1

Core References

Various Sources x_refsource_misc

https://advisories.octopus.com/adv/2021-01---Local-privilege-escalation-in-Octopus-Server-%28CVE-2021-26556%29.1733296189.html

Scores

CVSS v3 7.8

EPSS 0.0025

EPSS Percentile 16.5%

Attack Vector LOCAL

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

Details

CWE

CWE-426

Status published

Products (2)

octopus/octopus_deploy 0.9 - 2020.4.229

octopus/octopus_server 2020.5.0 - 2020.5.256

Published Oct 07, 2021

Tracked Since Feb 18, 2026