What is CVE-2020-9389?

CVE-2020-9389 is a low-severity vulnerability in Squaredup, classified under Observable Discrepancy. CVSS score: 3.7/10. Published 2021-02-03.

How severe is CVE-2020-9389?

Low severity. CVSS v3 base score is 3.7 out of 10.

Vulnerability in Squaredup

CVE-2020-9389

A username enumeration issue was discovered in SquaredUp before version 4.6.0. The login functionality was implemented in a way that would enable a malicious user to guess valid username due to a different response time from invalid usernames.

Published 2021-02-03 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 3.7 (Low). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N.

EPSS exploit prediction

EPSS: 0.009 (59.1th percentile), scored 2026-09-30.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 59th percentile — 59.1% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.009 · newest: 0.009 · change: 0.000

Affected products

Squaredup

Weakness classification (CWE)

CWE-203 — Observable Discrepancy

References

support.squaredup.com/hc/en-us/articles/360017255858 (Broken Link, Vendor Advisory)
support.squaredup.com/hc/en-us/articles/360019427238-CVE-2020-9389-Username-enu… (Broken Link, Vendor Advisory)

Frequently asked questions

What is CVE-2020-9389?: CVE-2020-9389 is a low-severity vulnerability in Squaredup, classified under Observable Discrepancy. CVSS score: 3.7/10. Published 2021-02-03.
How severe is CVE-2020-9389?: Low severity. CVSS v3 base score is 3.7 out of 10.