CVE-2021-27215

Name: CVE-2021-27215
Creator: NVD / NIST
Published: 2021-03-03T16:15:13.26+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

CRITICALCVSS 9.8/10EPSS 2.35%

Last modified Jun 17, 2026

CVE-2021-27215 is a critical-severity vulnerability rated 9.8/10 on the CVSS scale. An issue was discovered in genua genugate before 9.0 Z p19, 9.1.x through 9.6.x before 9.6 p7, and 10.x before 10.1 p4. The Web Interfaces (Admin, Userweb, Sidechannel) can use different methods to perform the authentication of a user. EPSS estimates a 2.35% chance of exploitation in the next 30 days.

Description

An issue was discovered in genua genugate before 9.0 Z p19, 9.1.x through 9.6.x before 9.6 p7, and 10.x before 10.1 p4. The Web Interfaces (Admin, Userweb, Sidechannel) can use different methods to perform the authentication of a user. A specific authentication method during login does not check the provided data (when a certain manipulation occurs) and returns OK for any authentication request. This allows an attacker to login to the admin panel as a user of his choice, e.g., the root user (with highest privileges) or even a non-existing user.

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

2.35%

81.5th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-306

Affected Software

Vendor	Product	Versions
Genua	Genuagate	<= 9.0
Genua	Genuagate	>= 10.0, <= 10.1
Genua	Genuagate	9.0
Genua	Genuagate	9.6.0
Genua	Genuagate	10.1

References

https://kunde.genua.de/en/overview/genugate.htmlPatch, Vendor Advisory
https://sec-consult.com/vulnerability-lab/advisory/authentication-bypass-genua-genugate/Exploit, Third Party Advisory
https://www.genua.de/en/it-security-solutions/high-resistance-firewall-genugateProduct
https://kunde.genua.de/en/overview/genugate.htmlPatch, Vendor Advisory
https://sec-consult.com/vulnerability-lab/advisory/authentication-bypass-genua-genugate/Exploit, Third Party Advisory
https://www.genua.de/en/it-security-solutions/high-resistance-firewall-genugateProduct

Timeline

Published: Mar 3, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-27215?

How severe is CVE-2021-27215?

CVE-2021-27215 has a CVSS score of 9.8/10 (CRITICAL severity). The EPSS model estimates a 2.35% probability of exploitation in the next 30 days.

How do I fix CVE-2021-27215?

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-2021-27215?

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

Scan your code now

Source: NVD / NIST