CVE-2020-21862: Directory traversal vulnerability in DuxCMS 2.1 allows attackers to delete arbitrary files via /admin/AdminBac

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HIGH 8.1DOWNGRADE

CVE-2020-21862 is a high-severity flaw (CVSS 8.1) affecting duxcms. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Directory traversal vulnerability in DuxCMS 2.1 allows attackers to delete arbitrary files via /admin/AdminBackup/del.

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	1.0% (top 38%)
CISA exploited list	No
Weakness	CWE-22
Published	2023-07-06
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: duxcms project

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

Am I affected?

Timeline

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

duxcms project duxcms DOWNGRADE

Affected: 2.1

Fixed in: no fixed release known

Safe to downgrade to: a release before 2.1

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 2.1 (Debian / Ubuntu)

apt-cache madison duxcms sudo apt install duxcms=<VERSION_BEFORE_2.1> sudo apt-mark hold duxcms

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

dnf --showduplicates list duxcms sudo dnf downgrade duxcms-<VERSION_BEFORE_2.1> sudo dnf versionlock add duxcms

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-2020-21862?

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

Is CVE-2020-21862 being exploited?

CVE-2020-21862 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-2020-21862 affect?

CVE-2020-21862 affects duxcms. Severity is high (CVSS 8.1). Directory traversal vulnerability in DuxCMS 2.1 allows attackers to delete arbitrary files via /admin/AdminBackup/del.

How urgent is CVE-2020-21862?

Priority 49/100. High severity; Public exploit reference

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CVE-2020-21881 MEDIUM 6.5 DOWNGRADE Cross Site Request Forgery (CSRF) vulnerability in admin.php in DuxCMS 2.1 allows remote attackers to modtify
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References

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