What is CVE-2020-18662?

CVE-2020-18662 is a critical-severity vulnerability in Sir Gnuboard, classified under SQL Injection. CVSS score: 9.8/10. Published 2021-06-24.

How severe is CVE-2020-18662?

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

SQL Injection in Sir Gnuboard

CVE-2020-18662

SQL Injection vulnerability in gnuboard5 <=v5.3.2.8 via the table_prefix parameter in install_db.php.

Vulnerability class: SQL Injection

Published 2021-06-24 · 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: 0.054 (92.4th percentile), scored 2026-10-02.

Low probability of exploitation in the next 30 days, but still tracked. 92nd percentile — 92.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.054 · newest: 0.054 · change: 0.000

Affected products

Sir Gnuboard

Weakness classification (CWE)

CWE-89 — SQL Injection

References

github.com/gnuboard/gnuboard5/issues/43 (Technical Description, Exploit)
www.seebug.org/vuldb/ssvid-97927 (Third Party Advisory)
github.com/LoRexxar/CVE_Request/tree/master/gnuboard5 mul vuls before v5.3.2.8 (Third Party Advisory)

Frequently asked questions

What is CVE-2020-18662?: CVE-2020-18662 is a critical-severity vulnerability in Sir Gnuboard, classified under SQL Injection. CVSS score: 9.8/10. Published 2021-06-24.
How severe is CVE-2020-18662?: Critical severity. CVSS v3 base score is 9.8 out of 10.