What is CVE-2018-20634?

CVE-2018-20634 is a medium-severity vulnerability in Advance B2b Script Project, classified under Improper Restriction of Operations within the Bounds of a Memory Buffer. CVSS score: 6.5/10. Published 2019-03-21.

How severe is CVE-2018-20634?

Medium severity. CVSS v3 base score is 6.5 out of 10.

Buffer overflow in Advance B2b Script Project

CVE-2018-20634

PHP Scripts Mall Advance B2B Script 2.1.4 allows remote attackers to cause a denial of service (changed Page structure) via JavaScript code in the First Name field.

Vulnerability class: Buffer Overflow

Published 2019-03-21 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H.

EPSS exploit prediction

EPSS: 0.016 (74.6th percentile), scored 2026-10-02.

Low probability of exploitation in the next 30 days, but still tracked. 75th percentile — 74.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.016 · newest: 0.016 · change: 0.000

Affected products

Advance B2b Script Project — versions 2.1.4

Weakness classification (CWE)

CWE-119 — Improper Restriction of Operations within the Bounds of a Memory Buffer

References

gkaim.com/cve-2018-20634-vikas-chaudhary/ (Exploit, Third Party Advisory)

Frequently asked questions

What is CVE-2018-20634?: CVE-2018-20634 is a medium-severity vulnerability in Advance B2b Script Project, classified under Improper Restriction of Operations within the Bounds of a Memory Buffer. CVSS score: 6.5/10. Published 2019-03-21.
How severe is CVE-2018-20634?: Medium severity. CVSS v3 base score is 6.5 out of 10.