CVE-2020-21503: waimai Super Cms 20150505 has a logic flaw allowing attackers to modify a price, before form submission, by ob

This week

HIGH 7.5REMOTEDOWNGRADE

CVE-2020-21503 is a high-severity flaw (CVSS 7.5) affecting waimai super cms. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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.

Why this priority

High severity
Public exploit reference
Remotely exploitable, no login, no user action

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	7.5 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	1.1% (top 36%)
CISA exploited list	No
Weakness	CWE-668
Published	2021-10-05
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: waimai super cms project

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2021-10-05 22:15 UTCPublished CVE record published
2026-06-17 03:03 UTCUpdated Record last modified

waimai super cms project waimai super cms DOWNGRADE

Affected: 20150505

Fixed in: no fixed release known

Safe to downgrade to: a release before 20150505

1. Check installed version

apt-cache policy waimai-super-cms || rpm -q waimai-super-cms || waimai-super-cms --version

2. No fixed release: DOWNGRADE to a release before 20150505 (Debian / Ubuntu)

apt-cache madison waimai-super-cms sudo apt install waimai-super-cms=<VERSION_BEFORE_20150505> sudo apt-mark hold waimai-super-cms

2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list waimai-super-cms sudo dnf downgrade waimai-super-cms-<VERSION_BEFORE_20150505> sudo dnf versionlock add waimai-super-cms

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2020-21503?

waimai super cms: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2020-21503 being exploited?

CVE-2020-21503 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2020-21503 affect?

CVE-2020-21503 affects waimai super cms. Severity is high (CVSS 7.5). 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.

How urgent is CVE-2020-21503?

Priority 52/100. High severity; Public exploit reference; Remotely exploitable, no login, no user action

Software pages

PHP vulnerabilities

Related CVEs

CVE-2020-21506 MEDIUM 6.1 DOWNGRADE waimai Super Cms 20150505 contains a cross-site scripting (XSS) vulnerability in the component /admin.php?m=Co
CVE-2020-21505 MEDIUM 6.1 DOWNGRADE waimai Super Cms 20150505 contains a cross-site scripting (XSS) vulnerability in the component /admin.php/Link
CVE-2020-21504 MEDIUM 6.1 DOWNGRADE waimai Super Cms 20150505 contains a cross-site scripting (XSS) vulnerability in the component /admin.php?&m=P

References

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