CVE-2020-21854: Cross Site Scripting vulnerabiity exists in WDScanner 1.1 in the system management page.

Routine

MEDIUM 6.1DOWNGRADE

CVE-2020-21854 is a medium-severity flaw (CVSS 6.1) affecting wdscanner. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Cross Site Scripting vulnerabiity exists in WDScanner 1.1 in the system management page.

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	0.6% (top 51%)
CISA exploited list	No
Weakness	CWE-79
Published	2021-07-30
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: tidesec

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

Am I affected?

Timeline

2021-07-30 14:15 UTCPublished CVE record published
2026-06-17 03:03 UTCUpdated Record last modified

tidesec wdscanner DOWNGRADE

Affected: 1.1

Fixed in: no fixed release known

Safe to downgrade to: a release before 1.1

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 1.1 (Debian / Ubuntu)

apt-cache madison wdscanner sudo apt install wdscanner=<VERSION_BEFORE_1.1> sudo apt-mark hold wdscanner

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

dnf --showduplicates list wdscanner sudo dnf downgrade wdscanner-<VERSION_BEFORE_1.1> sudo dnf versionlock add wdscanner

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-2020-21854?

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

Is CVE-2020-21854 being exploited?

CVE-2020-21854 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-2020-21854 affect?

CVE-2020-21854 affects wdscanner. Severity is medium (CVSS 6.1). Cross Site Scripting vulnerabiity exists in WDScanner 1.1 in the system management page.

How urgent is CVE-2020-21854?

Priority 38/100. Public exploit reference

References

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