What is CVE-2021-41974?

CVE-2021-41974 is a critical-severity vulnerability in Tad Book3, classified under Improper Authorization. CVSS score: 9.1/10. Published 2021-10-08.

How severe is CVE-2021-41974?

Critical severity. CVSS v3 base score is 9.1 out of 10.

Auth bypass in Tad Book3

CVE-2021-41974

Tad Book3 editing book page does not perform identity verification. Remote attackers can use the vulnerability to view and modify arbitrary content of books without permission.

Published 2021-10-08 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 9.1 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N.

EPSS exploit prediction

EPSS: 0.013 (68.5th percentile), scored 2026-09-29.

Low probability of exploitation in the next 30 days, but still tracked. 68th percentile — 68.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.013 · newest: 0.013 · change: 0.000

Affected products

Tad Book3 — versions 0
Tad Book3 Project

Weakness classification (CWE)

References

www.twcert.org.tw/tw/cp-132-5173-e21ba-1.html (Third Party Advisory)

Frequently asked questions

What is CVE-2021-41974?: CVE-2021-41974 is a critical-severity vulnerability in Tad Book3, classified under Improper Authorization. CVSS score: 9.1/10. Published 2021-10-08.
How severe is CVE-2021-41974?: Critical severity. CVSS v3 base score is 9.1 out of 10.