CVE-2020-21517: Cross Site Scripting (XSS) vulnerability in MetInfo 7.0.0 via the gourl parameter in login.php.

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MEDIUM 6.1DOWNGRADE

CVE-2020-21517 is a medium-severity flaw (CVSS 6.1) affecting metinfo. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Cross Site Scripting (XSS) vulnerability in MetInfo 7.0.0 via the gourl parameter in login.php.

Why this priority

Public exploit reference

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

Risk facts

CVSS score	6.1 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	1.0% (top 39%)
CISA exploited list	No
Weakness	CWE-79
Published	2021-06-21
Last modified	2026-07-09

Publisher (CNA): MITRE · Vendor: metinfo

Last updated 2026-07-09 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2021-06-21 15:15 UTCPublished CVE record published
2026-07-09 00:16 UTCUpdated Record last modified

metinfo metinfo DOWNGRADE

Affected: 7.0.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 7.0.0

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 7.0.0 (Debian / Ubuntu)

apt-cache madison metinfo sudo apt install metinfo=<VERSION_BEFORE_7.0.0> sudo apt-mark hold metinfo

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

dnf --showduplicates list metinfo sudo dnf downgrade metinfo-<VERSION_BEFORE_7.0.0> sudo dnf versionlock add metinfo

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-2020-21517?

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

Is CVE-2020-21517 being exploited?

CVE-2020-21517 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-2020-21517 affect?

CVE-2020-21517 affects metinfo. Severity is medium (CVSS 6.1). Cross Site Scripting (XSS) vulnerability in MetInfo 7.0.0 via the gourl parameter in login.php.

How urgent is CVE-2020-21517?

Priority 42/100. Public exploit reference

Software pages

PHP vulnerabilities

Related CVEs

CVE-2020-20585 HIGH 7.5 DOWNGRADE A blind SQL injection in /admin/?n=logs&c=index&a=dode of Metinfo 7.0 beta allows attackers to access sensitiv
CVE-2026-29014 CRITICAL 9.8 DOWNGRADE MetInfo CMS versions 7.9, 8.0, and 8.1 contain an unauthenticated PHP code injection vulnerability that allows
CVE-2025-63551 HIGH 7.5 UPGRADE A Server-Side Request Forgery (SSRF) vulnerability, achievable through an XML External Entity (XXE) injection,
CVE-2025-60454 MEDIUM 6.1 DOWNGRADE A stored Cross-Site Scripting (XSS) vulnerability has been discovered in MetInfo CMS version 8.0
CVE-2025-60453 MEDIUM 6.1 DOWNGRADE A stored Cross-Site Scripting (XSS) vulnerability has been discovered in MetInfo CMS version 8.0

References

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