What is CVE-2021-31820?

CVE-2021-31820 is a high-severity vulnerability in Linux Kernel, classified under Cleartext Storage of Sensitive Information. CVSS score: 7.5/10. Published 2021-08-18.

How severe is CVE-2021-31820?

High severity. CVSS v3 base score is 7.5 out of 10.

Vulnerability in Linux Kernel

CVE-2021-31820

In Octopus Server after version 2018.8.2 if the Octopus Server Web Request Proxy is configured with authentication, the password is shown in plaintext in the UI.

Published 2021-08-18 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N.

EPSS exploit prediction

EPSS: 0.006 (47.2th percentile), scored 2026-09-30.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 47th percentile — 47.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.006 · newest: 0.006 · change: 0.000

Affected products

Linux Kernel
Microsoft Windows
Octopus Server
Octopus Deploy Server — versions 2018.8.2, unspecified, 2021.1.7149

Weakness classification (CWE)

CWE-312 — Cleartext Storage of Sensitive Information

References

advisories.octopus.com/adv/2021-07---Proxy-Password-Stored-in-Plaintext-(CVE-20…

Frequently asked questions

What is CVE-2021-31820?: CVE-2021-31820 is a high-severity vulnerability in Linux Kernel, classified under Cleartext Storage of Sensitive Information. CVSS score: 7.5/10. Published 2021-08-18.
How severe is CVE-2021-31820?: High severity. CVSS v3 base score is 7.5 out of 10.