CVE-2025-52570CWE-770CWE-799

Letmein connection limiter allows an arbitrary amount of simultaneous connections

Low · published June 24, 2025

CVSS v4.0
1.7
EPSS
0%
Percentile
30.4
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v4.0
1.7 · LOW
Vector
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:U
EPSS
0.00376 · 30.4th percentile
Weaknesses
CWE-770 · Allocation of Resources Without Limits or Throttling; CWE-799 · Improper Control of Interaction Frequency
Published
2025-06-24T03:13Z
EPSS history
Timeline
  • 24 JUN 03:13Z
    Letmein connection limiter allows an arbitrary amount of simultaneous connections
    cvelistv5