CVE-2020-21480: An arbitrary file write vulnerability in RGCMS v1.06 allows attackers to execute arbitrary code via a crafted

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HIGH 7.2DOWNGRADE

CVE-2020-21480 is a high-severity flaw (CVSS 7.2) affecting rgcms. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

An arbitrary file write vulnerability in RGCMS v1.06 allows attackers to execute arbitrary code via a crafted PHP file.

Why this priority

High severity
Public exploit reference

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

Risk facts

CVSS score	7.2 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	High
User interaction	None
EPSS exploit chance	1.7% (top 23%)
CISA exploited list	No
Published	2021-09-15
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: rgcms project

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

Am I affected?

Timeline

2021-09-15 22:15 UTCPublished CVE record published
2026-06-17 03:03 UTCUpdated Record last modified

rgcms project rgcms DOWNGRADE

Affected: 1.06

Fixed in: no fixed release known

Safe to downgrade to: a release before 1.06

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 1.06 (Debian / Ubuntu)

apt-cache madison rgcms sudo apt install rgcms=<VERSION_BEFORE_1.06> sudo apt-mark hold rgcms

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

dnf --showduplicates list rgcms sudo dnf downgrade rgcms-<VERSION_BEFORE_1.06> sudo dnf versionlock add rgcms

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-2020-21480?

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

Is CVE-2020-21480 being exploited?

CVE-2020-21480 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-2020-21480 affect?

CVE-2020-21480 affects rgcms. Severity is high (CVSS 7.2). An arbitrary file write vulnerability in RGCMS v1.06 allows attackers to execute arbitrary code via a crafted PHP file.

How urgent is CVE-2020-21480?

Priority 49/100. High severity; Public exploit reference

Software pages

PHP vulnerabilities

Related CVEs

CVE-2020-21482 MEDIUM 5.4 DOWNGRADE A cross-site scripting (XSS) vulnerability in RGCMS v1.06 allows attackers to obtain the administrator's cooki
CVE-2020-21481 HIGH 7.2 DOWNGRADE An arbitrary file upload vulnerability in RGCMS v1.06 allows attackers to execute arbitrary code via a crafted

References

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