What is CVE-2021-42655?

CVE-2021-42655 is a high-severity vulnerability in Sscms Siteserver Cms, classified under SQL Injection. CVSS score: 8.8/10. Published 2022-05-24.

How severe is CVE-2021-42655?

High severity. CVSS v3 base score is 8.8 out of 10.

SQL Injection in Sscms Siteserver Cms

CVE-2021-42655

SiteServer CMS V6.15.51 is affected by a SQL injection vulnerability.

Vulnerability class: SQL Injection

Published 2022-05-24 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 8.8 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.012 (67.1th percentile), scored 2026-09-30.

Low probability of exploitation in the next 30 days, but still tracked. 67th percentile — 67.1% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.012 · newest: 0.012 · change: 0.000

Affected products

Sscms Siteserver Cms — versions 6.15.51

Weakness classification (CWE)

CWE-89 — SQL Injection

References

github.com/siteserver/cms (Third Party Advisory)
github.com/siteserver/cms/issues/3237 (Exploit, Third Party Advisory, Issue Tracking)
github.com/siteserver/cms/releases/download/siteserver-v6.15.51/siteserver_inst… (Third Party Advisory, Release Notes)

Frequently asked questions

What is CVE-2021-42655?: CVE-2021-42655 is a high-severity vulnerability in Sscms Siteserver Cms, classified under SQL Injection. CVSS score: 8.8/10. Published 2022-05-24.
How severe is CVE-2021-42655?: High severity. CVSS v3 base score is 8.8 out of 10.