What is CVE-2020-21503?

CVE-2020-21503 is a high-severity vulnerability in Waimai Super Cms Project, classified under Exposure of Resource to Wrong Sphere. CVSS score: 7.5/10. Published 2021-10-05.

How severe is CVE-2020-21503?

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

Vulnerability in Waimai Super Cms Project

CVE-2020-21503

waimai Super Cms 20150505 has a logic flaw allowing attackers to modify a price, before form submission, by observing data in a packet capture. By setting the index.php?m=gift&a=addsave credit parameter to -1, the product is sold for free.

Published 2021-10-05 · 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:N/I:H/A:N.

EPSS exploit prediction

EPSS: 0.011 (62.9th percentile), scored 2026-10-01.

Low probability of exploitation in the next 30 days, but still tracked. 63rd percentile — 62.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.011 · newest: 0.011 · change: 0.000

Affected products

Waimai Super Cms Project — versions 20150505

Weakness classification (CWE)

CWE-668 — Exposure of Resource to Wrong Sphere

References

github.com/caokang/waimai/issues/15 (Exploit, Third Party Advisory)

Frequently asked questions

What is CVE-2020-21503?: CVE-2020-21503 is a high-severity vulnerability in Waimai Super Cms Project, classified under Exposure of Resource to Wrong Sphere. CVSS score: 7.5/10. Published 2021-10-05.
How severe is CVE-2020-21503?: High severity. CVSS v3 base score is 7.5 out of 10.