CVE-2020-21554: A File Deletion vulnerability exists in TinyShop 3.1.1 in the back_list parameter in controllers\admin.php, wh

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HIGH 8.1DOWNGRADE

CVE-2020-21554 is a high-severity flaw (CVSS 8.1) affecting tinyshop. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

A File Deletion vulnerability exists in TinyShop 3.1.1 in the back_list parameter in controllers\admin.php, which could let a malicious user delete any file such as install.lock to reinstall cms.

Why this priority

High severity
Public exploit reference

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

Risk facts

CVSS score	8.1 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	1.5% (top 25%)
CISA exploited list	No
Published	2022-03-25
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: tinyrise

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

Am I affected?

Timeline

2022-03-25 16:15 UTCPublished CVE record published
2026-06-17 03:03 UTCUpdated Record last modified

tinyrise tinyshop DOWNGRADE

Affected: 3.1.1

Fixed in: no fixed release known

Safe to downgrade to: a release before 3.1.1

1. Check installed version

apt-cache policy tinyshop || rpm -q tinyshop || tinyshop --version

2. No fixed release: DOWNGRADE to a release before 3.1.1 (Debian / Ubuntu)

apt-cache madison tinyshop sudo apt install tinyshop=<VERSION_BEFORE_3.1.1> sudo apt-mark hold tinyshop

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

dnf --showduplicates list tinyshop sudo dnf downgrade tinyshop-<VERSION_BEFORE_3.1.1> sudo dnf versionlock add tinyshop

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-2020-21554?

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

Is CVE-2020-21554 being exploited?

CVE-2020-21554 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-2020-21554 affect?

CVE-2020-21554 affects tinyshop. Severity is high (CVSS 8.1). A File Deletion vulnerability exists in TinyShop 3.1.1 in the back_list parameter in controllers\admin.php, which could let a malicious user delete any file such as install.lock to reinstall cms.

How urgent is CVE-2020-21554?

Priority 52/100. High severity; Public exploit reference

Software pages

PHP vulnerabilities

Related CVEs

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References

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