What is CVE-2021-31821?

CVE-2021-31821 is a medium-severity vulnerability in Microsoft Windows, classified under Cleartext Storage of Sensitive Information. CVSS score: 5.5/10. Published 2022-01-19.

How severe is CVE-2021-31821?

Medium severity. CVSS v3 base score is 5.5 out of 10.

Vulnerability in Microsoft Windows

CVE-2021-31821

When the Windows Tentacle docker image starts up it logs all the commands that it runs along with the arguments, which writes the Octopus Server API key in plaintext. This does not affect the Linux Docker image

Published 2022-01-19 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 5.5 (Medium). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N.

EPSS exploit prediction

EPSS: 0.002 (7.3th percentile), scored 2026-09-29.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 7th percentile — 7.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.002 · newest: 0.002 · change: 0.000

Affected products

Microsoft Windows
Octopus Tentacle
Octopus Deploy Tentacle — versions unspecified

Weakness classification (CWE)

CWE-312 — Cleartext Storage of Sensitive Information

References

advisories.octopus.com/post/2022/sa2022-01/ (Vendor Advisory)

Frequently asked questions

What is CVE-2021-31821?: CVE-2021-31821 is a medium-severity vulnerability in Microsoft Windows, classified under Cleartext Storage of Sensitive Information. CVSS score: 5.5/10. Published 2022-01-19.
How severe is CVE-2021-31821?: Medium severity. CVSS v3 base score is 5.5 out of 10.