What is CVE-2021-31316?

CVE-2021-31316 is a critical-severity vulnerability in Control-Webpanel Webpanel, classified under SQL Injection. CVSS score: 9.8/10. Published 2021-05-18.

How severe is CVE-2021-31316?

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

Is CVE-2021-31316 known to be exploited?

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

SQL Injection in Control-Webpanel Webpanel

CVE-2021-31316

The unprivileged user portal part of CentOS Web Panel is affected by a SQL Injection via the 'idsession' HTTP POST parameter.

Vulnerability class: SQL Injection

Published 2021-05-18 · 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: 0.133 (96.3th percentile), scored 2026-09-30.

Moderate probability of exploitation in the next 30 days — watch for active exploitation reports. 96th percentile — 96.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.130 · newest: 0.133 · change: +0.002

Affected products

Control-Webpanel Webpanel

Weakness classification (CWE)

CWE-89 — SQL Injection

Public proof-of-concept exploits

References

www.shielder.it/advisories/centos-web-panel-idsession-root-rce/ (Exploit, Third Party Advisory)

Frequently asked questions

What is CVE-2021-31316?: CVE-2021-31316 is a critical-severity vulnerability in Control-Webpanel Webpanel, classified under SQL Injection. CVSS score: 9.8/10. Published 2021-05-18.
How severe is CVE-2021-31316?: Critical severity. CVSS v3 base score is 9.8 out of 10.
Is CVE-2021-31316 known to be exploited?: 3 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.