CRITICAL

CVE-2020-21991

Q: What is CVE-2020-21991?

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.

Q: Is CVE-2020-21991 actively exploited?

Active exploitation of CVE-2020-21991 has not been confirmed. Its EPSS score was 2.9% on 2026-10-19, the estimated probability of exploitation in the next 30 days.

Q: What is the CVSS score for CVE-2020-21991?

CVE-2020-21991 has a CVSS v3 base score of 9.8 (CRITICAL severity).

CVSS v3

9.8

CRITICAL

EPSS Score

2.9 %

exploit probability, as of 2026-10-19

CISA KEV

known exploited

Exploitation

—

SSVC status

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Affected and fixed versions

Neither OSV.dev nor the vendor advisories we read list affected versions for CVE-2020-21991 yet.

Full record on NVD

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.

Technical details

Published: 2021-04-28

Frequently asked questions

What is CVE-2020-21991?

Is CVE-2020-21991 actively exploited?

Active exploitation of CVE-2020-21991 has not been confirmed. Its EPSS score was 2.9% on 2026-10-19, the estimated probability of exploitation in the next 30 days.

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

CVE-2020-21991 has a CVSS v3 base score of 9.8 (CRITICAL severity).

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