CVE-2020-21991

Name: CVE-2020-21991
Creator: NVD / NIST
Published: 2021-04-28T14:15:07.577+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

CRITICALCVSS 9.8/10EPSS 2.91%

Last modified Jun 17, 2026

CVE-2020-21991 is a critical-severity vulnerability rated 9.8/10 on the CVSS scale. 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.. EPSS estimates a 2.91% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

9.8/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS Probability

2.91%

85.2th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-287

Affected Software

Vendor	Product	Versions
Ave	Dominaplus	>= 1.10.11, <= 1.10.77
Ave	53ab-Wbs Firmware	1.10.62
Ave	Ts01 Firmware	1.0.65
Ave	Ts03x-V Firmware	1.10.45a
Ave	Ts04x-V Firmware	1.10.45a
Ave	Ts05 Firmware	1.10.36
Ave	Ts05n-V Firmware	All versions

References

https://www.exploit-db.com/exploits/47822Exploit, Third Party Advisory, VDB Entry
https://www.zeroscience.mk/en/vulnerabilities/ZSL-2019-5549.phpExploit, Third Party Advisory
https://www.exploit-db.com/exploits/47822Exploit, Third Party Advisory, VDB Entry
https://www.zeroscience.mk/en/vulnerabilities/ZSL-2019-5549.phpExploit, Third Party Advisory

Timeline

Published: Apr 28, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2020-21991?

How severe is CVE-2020-21991?

CVE-2020-21991 has a CVSS score of 9.8/10 (CRITICAL severity). The EPSS model estimates a 2.91% probability of exploitation in the next 30 days.

How do I fix CVE-2020-21991?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2020-21991?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST