CVE-2025-52570 Information

Description

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.

Reference

https://github.com/mbuesch/letmein/commit/43207cd77580410d97165d1e3c07361ba6f3558c https://github.com/mbuesch/letmein/security/advisories/GHSA-jpv7-p47h-f43j

Related CNNVD

CNNVD-202506-3050 (Published: 2025-06-24)