CVE-2021-31821

API key disclosure via startup command logging

Published Jan 19, 2022 · Updated Aug 3, 2024

Cleartext logging in Octopus Tentacle before 6.1.1266 allows local users to read the Octopus Server API key from Windows container logs. The Windows image's startup path logs every executed command with its arguments, including the ServerApiKey value supplied for registration. Exposure requires access to the container's startup logs, and the Linux image is not affected; disclosure enables reuse of the server API credential.

CVSS severity5.5
Medium
EPSS probability0.18%
Next 30 days · Sep 17, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Cleartext logging in Octopus Tentacle before 6.1.1266 allows local users to read the Octopus Server API key from Windows container logs. The Windows image's startup path logs every executed command with its arguments, including the ServerApiKey value supplied for registration. Exposure requires access to the container's startup logs, and the Linux image is not affected; disclosure enables reuse of the server API credential.

The record

CVE
CVE-2021-31821
Published
Jan 19, 2022
Updated
Aug 3, 2024
Vendor
Octopus Deploy
Product
Octopus Tentacle
Classifications
CWE-312, T1552.001
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Jan 19, 2022CVE publishedPublication date reported by the CVE source.
  2. Aug 3, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=unspecified <6.1.1266

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

Octopus Deploy · Octopus Tentacleversion=unspecified <6.1.1266

Published CVSS scores

2.1NIST NVDAV:L/AC:L/Au:N/C:P/I:N/A:N
5.5NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 11, 2026Sep 17, 2026
Latest reporting daySep 17, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-312Cleartext Storage of Sensitive Information
T1552.001Unsecured Credentials: Credentials In Files

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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