What is CVE-2021-3005?

CVE-2021-3005 is a medium-severity vulnerability in Mk-Auth. CVSS score: 4.3/10. Published 2021-01-03.

How severe is CVE-2021-3005?

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

Vulnerability in Mk-Auth

CVE-2021-3005

MK-AUTH through 19.01 K4.9 allows remote attackers to obtain sensitive information (e.g., a CPF number) via a modified titulo (aka invoice number) value to the central/recibo.php URI.

Published 2021-01-03 · last modified 2026-06-17.

CVSS v3 metric

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

EPSS exploit prediction

EPSS: 0.009 (57.1th percentile), scored 2026-09-30.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 57th percentile — 57.1% 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

Mk-Auth

References

mk-auth.com.br/ (Vendor Advisory)
gist.github.com/alacerda/3b925cb333eb839ae808d6f01642aeb3 (Third Party Advisory)

Frequently asked questions

What is CVE-2021-3005?: CVE-2021-3005 is a medium-severity vulnerability in Mk-Auth. CVSS score: 4.3/10. Published 2021-01-03.
How severe is CVE-2021-3005?: Medium severity. CVSS v3 base score is 4.3 out of 10.