High severity · published Oct 27, 2021
CVE-2021-34580
In mymbCONNECT24, mbCONNECT24 <= 2.9.0 an unauthenticated user can enumerate valid backend users by checking what kind of response the server sends for crafted invalid login…
7.5
CVSS
1%
EPSS
No
On KEV
Description
In mymbCONNECT24, mbCONNECT24 <= 2.9.0 an unauthenticated user can enumerate valid backend users by checking what kind of response the server sends for crafted invalid login attempts.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
High
Integrity
None
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)1.0% · higher than 64% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
MB
Mbconnect24 · Mbconnectline
through 2.9.0 · source: NVD
MY
Mymbconnect24 · Mbconnectline
through 2.9.0 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2021-34580
CVE.org
https://www.cve.org/CVERecord?id=CVE-2021-34580
Third Party Advisory
https://cert.vde.com/en/advisories/VDE-2021-037/
More from Mbconnect24
9.8
CVE-2020-35565
An issue was discovered in MB CONNECT LINE mymbCONNECT24 and mbCONNECT24 through 2.6.2
9.8
CVE-2020-10383
An issue was discovered in the MB CONNECT LINE mymbCONNECT24 and mbCONNECT24 software in all versions through 2.5.0
9.1
CVE-2026-33615
MB connect line mbCONNECT24 vulnerable to an unauthenticated SQL injection in the setinfo Endpoint
8.8
CVE-2026-33613
MB connect line mbCONNECT24 vulnerable to RCE in generateSrpArray
8.8
CVE-2023-0985
An Authorization Bypass vulnerability was found in MB Connect Lines mbCONNECT24, mymbCONNECT24 and Helmholz' myREX24 and myREX24.virtual version <= 2.13.3. An authenticated remote…