CVE-2020-21998: In HomeAutomation 3.3.2 input passed via the 'redirect' GET parameter in 'api.php' script is not properly veri

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MEDIUM 6.1DOWNGRADE

CVE-2020-21998 is a medium-severity flaw (CVSS 6.1) affecting homeautomation. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

In HomeAutomation 3.3.2 input passed via the 'redirect' GET parameter in 'api.php' script is not properly verified before being used to redirect users. This can be exploited to redirect a user to an arbitrary website e.g. when a user clicks a specially crafted link to the affected script hosted on a trusted domain.

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	1.3% (top 29%)
CISA exploited list	No
Weakness	CWE-601
Published	2021-04-27
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: homeautomation project

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

Am I affected?

Timeline

2021-04-27 18:15 UTCPublished CVE record published
2026-06-17 03:04 UTCUpdated Record last modified

homeautomation project homeautomation DOWNGRADE

Affected: 3.3.2

Fixed in: no fixed release known

Safe to downgrade to: a release before 3.3.2

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 3.3.2 (Debian / Ubuntu)

apt-cache madison homeautomation sudo apt install homeautomation=<VERSION_BEFORE_3.3.2> sudo apt-mark hold homeautomation

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

dnf --showduplicates list homeautomation sudo dnf downgrade homeautomation-<VERSION_BEFORE_3.3.2> sudo dnf versionlock add homeautomation

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.

Public exploits and detection

Public code exists for this CVE. Treat unpatched systems as at risk, and only run PoCs in a lab.

Nuclei scan template: HomeAutomation 3.3.2 - Open Redirect

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-2020-21998?

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

Is CVE-2020-21998 being exploited?

CVE-2020-21998 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-2020-21998 affect?

CVE-2020-21998 affects homeautomation. Severity is medium (CVSS 6.1). In HomeAutomation 3.3.2 input passed via the 'redirect' GET parameter in 'api.php' script is not properly verified before being used to redirect users. This can be exploited to redirect a user to an arbitrary website e.g. when a user clicks

How urgent is CVE-2020-21998?

Priority 44/100. Public exploit reference

Software pages

PHP vulnerabilities

Related CVEs

CVE-2020-22001 CRITICAL 9.8 DOWNGRADE HomeAutomation 3.3.2 suffers from an authentication bypass vulnerability when spoofing client IP address using
CVE-2020-22000 HIGH 8.0 DOWNGRADE HomeAutomation 3.3.2 suffers from an authenticated OS command execution vulnerability using custom command v0.
CVE-2020-21989 HIGH 8.8 DOWNGRADE HomeAutomation 3.3.2 is affected by Cross Site Request Forgery (CSRF)
CVE-2020-21987 MEDIUM 6.1 DOWNGRADE HomeAutomation 3.3.2 is affected by persistent Cross Site Scripting (XSS)

References

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