HOMEVULNERABILITIESCVE-2021-27215
CRITICAL

CVE-2021-27215

CWE-306Published: March 3, 2021· Updated: Jun 17, 2026

9.8
CVSS v3.1

Official 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.

NVD Source

Technical Analysis

CVE-2021-27215 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.

CVSS v3.1 Vector Breakdown

Exploitability
Attack VectorNetwork
Attack ComplexityLow
Privileges Req.None
User InteractionNone
ScopeUnchanged
Impact
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected Vendors & Products

genua1 product(s)
genuagate
Source: NVD CPE · 4 total CPE entries

Exploit & PoC Resources

NO KNOWN EXPLOITNo public exploit confirmed at this time
Exploit-DB
Offensive Security exploit database
GitHub PoC Search
Community PoC repositories
Rapid7 / Metasploit
Metasploit module search
PacketStorm
Security advisories & exploits
NVD Detail
Official NIST entry
MITRE CVE
CVE Program entry
External links open in a new tab. Always verify in a controlled environment before use.

Official Patches & Advisories

PATCHhttps://kunde.genua.de/en/overview/genugate.html
PATCHhttps://kunde.genua.de/en/overview/genugate.html
ADVISORYhttps://sec-consult.com/vulnerability-lab/advisory/authentication-bypass-genua-genugate/
ADVISORYhttps://sec-consult.com/vulnerability-lab/advisory/authentication-bypass-genua-genugate/

All References (6)

→
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

Quick Facts

CVE IDCVE-2021-27215
CVSS Score9.8 / 10
SeverityCRITICAL
WeaknessCWE-306
CISA KEVNo
Affected1 vendor(s)
PublishedMar 3, 2021

Related CVEs (CWE-306)

CVE-2025-9574
10.0
CVE-2026-23693
10.0
CVE-2026-64812
10.0
CVE-2024-48966
10.0
CVE-2026-35292
10.0
CVE-2026-3611
10.0

Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2021-27215 in threat intel feeds
  • →Review IDS/IPS signatures for exploitation attempts
Data sourced from NVD (NIST), CISA KEV, and EPSS (FIRST). Analysis generated by CTIWatch. CVE data is provided under the NVD usage policy.
← All Vulnerabilities·Search for CVE-2021-27215·NVD