CVE-2020-21662: SQL injection vulnerability in yunyecms 2.0.2 allows remote attackers to run arbitrary SQL commands via XFF.

This month

CRITICAL 9.8REMOTEDOWNGRADE

CVE-2020-21662 is a critical-severity flaw (CVSS 9.8) affecting yunyecms. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

SQL injection vulnerability in yunyecms 2.0.2 allows remote attackers to run arbitrary SQL commands via XFF.

Why this priority

Critical severity
Remotely exploitable, no login, no user action

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

Risk facts

CVSS score	9.8 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.8% (top 44%)
CISA exploited list	No
Weakness	CWE-89
Published	2023-07-31
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: yunyecms

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

Am I affected?

Timeline

2023-07-31 14:15 UTCPublished CVE record published
2026-06-17 03:03 UTCUpdated Record last modified

yunyecms yunyecms DOWNGRADE

Affected: 2.0.2

Fixed in: no fixed release known

Safe to downgrade to: a release before 2.0.2

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 2.0.2 (Debian / Ubuntu)

apt-cache madison yunyecms sudo apt install yunyecms=<VERSION_BEFORE_2.0.2> sudo apt-mark hold yunyecms

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

dnf --showduplicates list yunyecms sudo dnf downgrade yunyecms-<VERSION_BEFORE_2.0.2> sudo dnf versionlock add yunyecms

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-2020-21662?

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

Is CVE-2020-21662 being exploited?

CVE-2020-21662 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-2020-21662 affect?

CVE-2020-21662 affects yunyecms. Severity is critical (CVSS 9.8). SQL injection vulnerability in yunyecms 2.0.2 allows remote attackers to run arbitrary SQL commands via XFF.

How urgent is CVE-2020-21662?

Priority 53/100. Critical severity; Remotely exploitable, no login, no user action

References

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