What is CVE-2021-27557?

CVE-2021-27557 is a medium-severity vulnerability in Easycorp Zentao, classified under Cross-Site Request Forgery (CSRF). CVSS score: 4.3/10. Published 2021-08-31.

How severe is CVE-2021-27557?

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

CSRF in Easycorp Zentao

CVE-2021-27557

A cross-site request forgery (CSRF) vulnerability in the Cron job tab in EasyCorp ZenTao 12.5.3 allows attackers to update the fields of a Cron job.

Vulnerability class: CSRF (Cross-Site Request Forgery)

Published 2021-08-31 · last modified 2026-06-17.

CVSS v3 metric

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

EPSS exploit prediction

EPSS: 0.004 (27.3th percentile), scored 2026-09-30.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 27th percentile — 27.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.004 · newest: 0.004 · change: 0.000

Affected products

Easycorp Zentao — versions 12.5.3

Weakness classification (CWE)

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

References

privasec.com/blog/zentao-cms-a-monkeys-journey-to-priv-esc-remote-code-executio… (Exploit, Third Party Advisory)

Frequently asked questions

What is CVE-2021-27557?: CVE-2021-27557 is a medium-severity vulnerability in Easycorp Zentao, classified under Cross-Site Request Forgery (CSRF). CVSS score: 4.3/10. Published 2021-08-31.
How severe is CVE-2021-27557?: Medium severity. CVSS v3 base score is 4.3 out of 10.