CVE-2025-52570

Name: CVE-2025-52570
Creator: NVD / NIST
Published: 2025-06-24T04:15:50.36+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

LOWCVSS 1.7/10EPSS 0.33%

Last modified Jun 17, 2026

CVE-2025-52570 is a low-severity vulnerability rated 1.7/10 on the CVSS scale. Letmein is an authenticating port knocker. Prior to version 10.2.1, The connection limiter is implemented incorrectly. EPSS estimates a 0.33% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 4.0

1.7/10

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/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

EPSS Probability

0.33%

24.7th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

References

Timeline

Published: Jun 24, 2025
Last Modified: Jun 17, 2026
Status: Deferred

Frequently Asked Questions

What is CVE-2025-52570?

How severe is CVE-2025-52570?

CVE-2025-52570 has a CVSS score of 1.7/10 (LOW severity). The EPSS model estimates a 0.33% probability of exploitation in the next 30 days.

How do I fix CVE-2025-52570?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2025-52570?

Run a free Strix scan to check your systems for this vulnerability.

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Source: NVD / NIST