What is CVE-2021-4031?

CVE-2021-4031 is a high-severity vulnerability in Syltek, classified under Insufficient Verification of Data Authenticity. CVSS score: 7.5/10. Published 2022-03-18.

How severe is CVE-2021-4031?

High severity. CVSS v3 base score is 7.5 out of 10.

Vulnerability in Syltek

CVE-2021-4031

Syltek application before its 10.22.00 version, does not correctly check that a product ID has a valid payment associated to it. This could allow an attacker to forge a request and bypass the payment system by marking items as payed without any verification.

Published 2022-03-18 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N.

EPSS exploit prediction

EPSS: 0.005 (38.7th percentile), scored 2026-10-01.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 39th percentile — 38.7% 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

Syltek — versions 10.22.00

Weakness classification (CWE)

CWE-345 — Insufficient Verification of Data Authenticity

References

www.incibe-cert.es/en/early-warning/security-advisories/syltek-insufficient-ver… (Third Party Advisory)

Frequently asked questions

What is CVE-2021-4031?: CVE-2021-4031 is a high-severity vulnerability in Syltek, classified under Insufficient Verification of Data Authenticity. CVSS score: 7.5/10. Published 2022-03-18.
How severe is CVE-2021-4031?: High severity. CVSS v3 base score is 7.5 out of 10.