What is CVE-2021-42336?

CVE-2021-42336 is a medium-severity vulnerability in Huachu Digital Technology Co.,ltd. Easytest, classified under Improper Authorization. CVSS score: 4.3/10. Published 2021-10-15.

How severe is CVE-2021-42336?

Medium severity. CVSS v3 base score is 4.3 out of 10.

Auth bypass in Huachu Digital Technology Co.,ltd. Easytest

CVE-2021-42336

The learning history page of the Easytest is vulnerable by permission bypass. After obtaining a user’s permission, remote attackers can access other users’ and administrator’s account information except password by crafting URL parameters.

Published 2021-10-15 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 4.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N.

EPSS exploit prediction

EPSS: 0.008 (56.6th percentile), scored 2026-10-05.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 57th percentile — 56.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.008 · newest: 0.008 · change: 0.000

Affected products

Huachu Digital Technology Co.,ltd. Easytest — versions 1705
Huaju Easytest Online Learning Test Platform — versions 1705

Weakness classification (CWE)

CWE-285 — Improper Authorization

References

www.twcert.org.tw/tw/cp-132-5205-1de5a-1.html (Third Party Advisory)

Frequently asked questions

What is CVE-2021-42336?: CVE-2021-42336 is a medium-severity vulnerability in Huachu Digital Technology Co.,ltd. Easytest, classified under Improper Authorization. CVSS score: 4.3/10. Published 2021-10-15.
How severe is CVE-2021-42336?: Medium severity. CVSS v3 base score is 4.3 out of 10.