What is CVE-2021-40636?

CVE-2021-40636 is a high-severity vulnerability in Os4ed Opensis, classified under SQL Injection. CVSS score: 7.5/10. Published 2022-03-03.

How severe is CVE-2021-40636?

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

Is CVE-2021-40636 known to be exploited?

3 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

SQL Injection in Os4ed Opensis

CVE-2021-40636

OS4ED openSIS 8.0 is affected by SQL Injection in CheckDuplicateName.php, which can extract information from the database.

Vulnerability class: SQL Injection

Published 2022-03-03 · 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:H/I:N/A:N.

EPSS exploit prediction

EPSS: 0.013 (69.6th percentile), scored 2026-10-21.

Low probability of exploitation in the next 30 days, but still tracked. 70th percentile — 69.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.013 · newest: 0.013 · change: 0.000

Affected products

Os4ed Opensis — versions 8.0

Weakness classification (CWE)

CWE-89 — SQL Injection

Public proof-of-concept exploits

References

github.com/OS4ED/openSIS-Classic/issues/198 (Exploit, Third Party Advisory, Issue Tracking)

Frequently asked questions

What is CVE-2021-40636?: CVE-2021-40636 is a high-severity vulnerability in Os4ed Opensis, classified under SQL Injection. CVSS score: 7.5/10. Published 2022-03-03.
How severe is CVE-2021-40636?: High severity. CVSS v3 base score is 7.5 out of 10.
Is CVE-2021-40636 known to be exploited?: 3 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.