Is CVE-2020-21987 actively exploited?

No active exploitation of CVE-2020-21987 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2020-21987 be exploited remotely?

Yes. CVE-2020-21987 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2020-21987?

CVE-2020-21987 has a CVSS score of 6.1 (MEDIUM).

HOME VULNERABILITIESCVE-2020-21987

MEDIUM

CVE-2020-21987

CWE-79Published: April 27, 2021· Updated: Jun 17, 2026

6.1

CVSS v3.1

Official Description

HomeAutomation 3.3.2 is affected by persistent Cross Site Scripting (XSS). XSS vulnerabilities occur when input passed via several parameters to several scripts is not properly sanitized before being returned to the user. This can be exploited to execute arbitrary HTML and script code in a user's browser session.

NVD Source

Technical Analysis

CVE-2020-21987 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

Exploitation does not require any privileges, though user interaction (Required) is needed, which slightly reduces the risk of mass automated attacks.

The vulnerability has a "Changed" scope, meaning successful exploitation can impact components beyond the vulnerable component itself — such as the host operating system or adjacent services.

From a weakness classification perspective (CWE-79): Cross-site scripting (XSS) vulnerabilities allow attackers to inject malicious scripts into web pages viewed by other users.