Is CVE-2020-21991 actively exploited?

No active exploitation of CVE-2020-21991 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2020-21991 be exploited remotely?

Yes. CVE-2020-21991 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2020-21991?

CVE-2020-21991 has a CVSS score of 9.8 (CRITICAL).

HOME VULNERABILITIESCVE-2020-21991

CRITICAL

CVE-2020-21991

CWE-287Published: April 28, 2021· Updated: Jun 17, 2026

9.8

CVSS v3.1

Official Description

AVE DOMINAplus <=1.10.x suffers from an authentication bypass vulnerability due to missing control check when directly calling the autologin GET parameter in changeparams.php script. Setting the autologin value to 1 allows an unauthenticated attacker to permanently disable the authentication security control and access the management interface with admin privileges without providing credentials.

NVD Source

Technical Analysis

CVE-2020-21991 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in complete confidentiality breach (data exposure), full integrity compromise (data manipulation), availability disruption (denial of service), with a CVSS base score of 9.8.

From a weakness classification perspective (CWE-287): Authentication bypass vulnerabilities allow attackers to access protected resources without valid credentials.