CVE-2025-52570
Letmein connection limiter allows an arbitrary amount of simultaneous connections
We use these services and cookies to improve your user experience. You may opt out if you wish, however, this may limit some features on this site.
Please see our statement on Data Privacy.
Letmein connection limiter allows an arbitrary amount of simultaneous connections
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.
Reserved 2025-06-18 | Published 2025-06-24 | Updated 2025-06-24 | Assigner GitHub_MCWE-799: Improper Control of Interaction Frequency
CWE-770: Allocation of Resources Without Limits or Throttling
github.com/...etmein/security/advisories/GHSA-jpv7-p47h-f43j
github.com/...ommit/43207cd77580410d97165d1e3c07361ba6f3558c
Support options
