What is CVE-2020-21431?

CVE-2020-21431 is a medium-severity vulnerability in Hongcms Project. CVSS score: 6.5/10. Published 2021-10-04.

How severe is CVE-2020-21431?

Medium severity. CVSS v3 base score is 6.5 out of 10.

Vulnerability in Hongcms Project

CVE-2020-21431

HongCMS v3.0 contains an arbitrary file read and write vulnerability in the component /admin/index.php/template/edit.

Published 2021-10-04 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:N.

EPSS exploit prediction

EPSS: 0.009 (59.5th percentile), scored 2026-10-02.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 60th percentile — 59.5% 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

Hongcms Project — versions 3.0.0

References

github.com/Neeke/HongCMS/issues/14 (Exploit, Third Party Advisory)

Frequently asked questions

What is CVE-2020-21431?: CVE-2020-21431 is a medium-severity vulnerability in Hongcms Project. CVSS score: 6.5/10. Published 2021-10-04.
How severe is CVE-2020-21431?: Medium severity. CVSS v3 base score is 6.5 out of 10.