What is CVE-2021-4164?

CVE-2021-4164 is a high-severity vulnerability in Janeczku Calibre-Web, classified under Cross-Site Request Forgery (CSRF). CVSS score: 8.8/10. Published 2022-01-17.

How severe is CVE-2021-4164?

High severity. CVSS v3 base score is 8.8 out of 10.

CSRF in Janeczku Calibre-Web

CVE-2021-4164

calibre-web is vulnerable to Cross-Site Request Forgery (CSRF)

Vulnerability class: CSRF (Cross-Site Request Forgery)

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

CVSS v3 metric

CVSS v3 base score 8.8 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.005 (43.5th percentile), scored 2026-09-29.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 43rd percentile — 43.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.005 · newest: 0.005 · change: 0.000

Affected products

Janeczku Calibre-Web
Janeczku Janeczku/calibre-Web — versions unspecified

Weakness classification (CWE)

CWE-352 — Cross-Site Request Forgery (CSRF)

References

huntr.dev/bounties/2debace1-a0f3-45c1-95fa-9d0512680758 (Exploit, Third Party Advisory)
github.com/janeczku/calibre-web/commit/785726deee13b4d56f6c3503dd57c1e3eb7d6f30 (Patch, Third Party Advisory)

Frequently asked questions

What is CVE-2021-4164?: CVE-2021-4164 is a high-severity vulnerability in Janeczku Calibre-Web, classified under Cross-Site Request Forgery (CSRF). CVSS score: 8.8/10. Published 2022-01-17.
How severe is CVE-2021-4164?: High severity. CVSS v3 base score is 8.8 out of 10.