CVE-2025-52570
June 24, 2025
Letmein is an authenticating port knocker. Prior to version 10.2.1, The connection limiter is implemented incorrectly. It allows an arbitrary amount of simultaneously incoming connections (TCP, UDP and Unix socket) for the services letmeind and letmeinfwd. Therefore, the command line option num-connections is not effective and does not limit the number of simultaneously incoming connections. This issue has been patched in version 10.2.1.
Affected Packages
https://github.com/mbuesch/letmein.git (GITHUB):
Affected version(s) >=letmein-1.0.0 <letmein-10.2.1Fix Suggestion:
Update to version letmein-10.2.1letmeinfwd (RUST):
Affected version(s) >=3.0.0 <10.2.1Fix Suggestion:
Update to version 10.2.1letmein (RUST):
Affected version(s) >=0.0.0 <10.2.1Fix Suggestion:
Update to version 10.2.1Related Resources (4)
Do you need more information?
Contact UsCVSS v4
Base Score:
1.7
Attack Vector
NETWORK
Attack Complexity
LOW
Attack Requirements
PRESENT
Privileges Required
NONE
User Interaction
NONE
Vulnerable System Confidentiality
NONE
Vulnerable System Integrity
NONE
Vulnerable System Availability
LOW
Subsequent System Confidentiality
NONE
Subsequent System Integrity
NONE
Subsequent System Availability
NONE
Exploit Maturity
UNREPORTED
CVSS v3
Base Score:
5.3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
NONE
Availability
LOW
Weakness Type (CWE)
EPSS
Base Score:
0.04
