What is CVE-2021-40881?

CVE-2021-40881 is a critical-severity vulnerability in Publiccms. CVSS score: 9.8/10. Published 2021-09-15.

How severe is CVE-2021-40881?

Critical severity. CVSS v3 base score is 9.8 out of 10.

Vulnerability in Publiccms

CVE-2021-40881

An issue in the BAT file parameters of PublicCMS v4.0 allows attackers to execute arbitrary code.

Published 2021-09-15 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.016 (74.9th percentile), scored 2026-09-29.

Low probability of exploitation in the next 30 days, but still tracked. 75th percentile — 74.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.016 · newest: 0.016 · change: 0.000

Affected products

Publiccms — versions 4.0

References

github.com/sanluan/PublicCMS/issues/57 (Exploit, Third Party Advisory, Issue Tracking)

Frequently asked questions

What is CVE-2021-40881?: CVE-2021-40881 is a critical-severity vulnerability in Publiccms. CVSS score: 9.8/10. Published 2021-09-15.
How severe is CVE-2021-40881?: Critical severity. CVSS v3 base score is 9.8 out of 10.