CVE-2025-52570

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Source
https://cve.org/CVERecord?id=CVE-2025-52570
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2025-52570.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2025-52570
Aliases
Published
2025-06-24T03:13:29.370Z
Modified
2026-07-15T01:49:21.876333084Z
Severity
  • 1.7 (Low) CVSS_V4 - 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 CVSS Calculator
Summary
Letmein connection limiter allows an arbitrary amount of simultaneous connections
Details

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.

Database specific 
{
    "cna_assigner": "GitHub_M",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/52xxx/CVE-2025-52570.json",
    "cwe_ids": [
        "CWE-770",
        "CWE-799"
    ]
}
References

Affected packages

Git / github.com/mbuesch/letmein

Affected ranges

Type
GIT
Repo
https://github.com/mbuesch/letmein
Events
Introduced
0 Unknown introduced commit / All previous commits are affected
Fixed
43207cd77580410d97165d1e3c07361ba6f3558c
Database specific 
{
    "source": [
        "AFFECTED_FIELD",
        "REFERENCES"
    ],
    "extracted_events": [
        {
            "introduced": "0"
        },
        {
            "fixed": "10.2.1"
        }
    ]
}

Affected versions

letmein-1.*
letmein-1.0.0
letmein-1.1.0
letmein-10.*
letmein-10.0.0
letmein-10.0.1
letmein-10.1.0
letmein-10.2.0
letmein-2.*
letmein-2.0.0
letmein-3.*
letmein-3.0.0
letmein-4.*
letmein-4.0.0
letmein-5.*
letmein-5.0.0
letmein-5.1.0
letmein-6.*
letmein-6.0.0
letmein-7.*
letmein-7.0.0
letmein-7.1.0
letmein-7.2.0
letmein-8.*
letmein-8.0.0
letmein-9.*
letmein-9.0.0
letmein-conf-1.*
letmein-conf-1.0.0
letmein-conf-1.1.0
letmein-conf-10.*
letmein-conf-10.0.0
letmein-conf-10.0.1
letmein-conf-10.1.0
letmein-conf-10.2.0
letmein-conf-2.*
letmein-conf-2.0.0
letmein-conf-3.*
letmein-conf-3.0.0
letmein-conf-4.*
letmein-conf-4.0.0
letmein-conf-5.*
letmein-conf-5.0.0
letmein-conf-5.1.0
letmein-conf-6.*
letmein-conf-6.0.0
letmein-conf-7.*
letmein-conf-7.0.0
letmein-conf-7.1.0
letmein-conf-7.2.0
letmein-conf-8.*
letmein-conf-8.0.0
letmein-conf-9.*
letmein-conf-9.0.0
letmein-fwproto-10.*
letmein-fwproto-10.0.0
letmein-fwproto-10.0.1
letmein-fwproto-10.1.0
letmein-fwproto-10.2.0
letmein-fwproto-3.*
letmein-fwproto-3.0.0
letmein-fwproto-4.*
letmein-fwproto-4.0.0
letmein-fwproto-5.*
letmein-fwproto-5.0.0
letmein-fwproto-5.1.0
letmein-fwproto-6.*
letmein-fwproto-6.0.0
letmein-fwproto-7.*
letmein-fwproto-7.0.0
letmein-fwproto-7.1.0
letmein-fwproto-7.2.0
letmein-fwproto-8.*
letmein-fwproto-8.0.0
letmein-fwproto-9.*
letmein-fwproto-9.0.0
letmein-proto-1.*
letmein-proto-1.0.0
letmein-proto-1.1.0
letmein-proto-10.*
letmein-proto-10.0.0
letmein-proto-10.0.1
letmein-proto-10.1.0
letmein-proto-10.2.0
letmein-proto-2.*
letmein-proto-2.0.0
letmein-proto-3.*
letmein-proto-3.0.0
letmein-proto-4.*
letmein-proto-4.0.0
letmein-proto-5.*
letmein-proto-5.0.0
letmein-proto-5.1.0
letmein-proto-6.*
letmein-proto-6.0.0
letmein-proto-7.*
letmein-proto-7.0.0
letmein-proto-7.1.0
letmein-proto-7.2.0
letmein-proto-8.*
letmein-proto-8.0.0
letmein-proto-9.*
letmein-proto-9.0.0
letmein-seccomp-10.*
letmein-seccomp-10.0.0
letmein-seccomp-10.0.1
letmein-seccomp-10.1.0
letmein-seccomp-10.2.0
letmein-seccomp-3.*
letmein-seccomp-3.0.0
letmein-seccomp-4.*
letmein-seccomp-4.0.0
letmein-seccomp-5.*
letmein-seccomp-5.0.0
letmein-seccomp-5.1.0
letmein-seccomp-6.*
letmein-seccomp-6.0.0
letmein-seccomp-7.*
letmein-seccomp-7.0.0
letmein-seccomp-7.1.0
letmein-seccomp-7.2.0
letmein-seccomp-8.*
letmein-seccomp-8.0.0
letmein-seccomp-9.*
letmein-seccomp-9.0.0
letmein-systemd-1.*
letmein-systemd-1.0.0
letmein-systemd-1.1.0
letmein-systemd-10.*
letmein-systemd-10.0.0
letmein-systemd-10.0.1
letmein-systemd-10.1.0
letmein-systemd-10.2.0
letmein-systemd-2.*
letmein-systemd-2.0.0
letmein-systemd-3.*
letmein-systemd-3.0.0
letmein-systemd-4.*
letmein-systemd-4.0.0
letmein-systemd-5.*
letmein-systemd-5.0.0
letmein-systemd-5.1.0
letmein-systemd-6.*
letmein-systemd-6.0.0
letmein-systemd-7.*
letmein-systemd-7.0.0
letmein-systemd-7.1.0
letmein-systemd-7.2.0
letmein-systemd-8.*
letmein-systemd-8.0.0
letmein-systemd-9.*
letmein-systemd-9.0.0
letmeind-1.*
letmeind-1.0.0
letmeind-1.1.0
letmeind-10.*
letmeind-10.0.0
letmeind-10.0.1
letmeind-10.1.0
letmeind-10.2.0
letmeind-2.*
letmeind-2.0.0
letmeind-3.*
letmeind-3.0.0
letmeind-4.*
letmeind-4.0.0
letmeind-5.*
letmeind-5.0.0
letmeind-5.1.0
letmeind-6.*
letmeind-6.0.0
letmeind-7.*
letmeind-7.0.0
letmeind-7.1.0
letmeind-7.2.0
letmeind-8.*
letmeind-8.0.0
letmeind-9.*
letmeind-9.0.0
letmeinfwd-10.*
letmeinfwd-10.0.0
letmeinfwd-10.0.1
letmeinfwd-10.1.0
letmeinfwd-10.2.0
letmeinfwd-3.*
letmeinfwd-3.0.0
letmeinfwd-4.*
letmeinfwd-4.0.0
letmeinfwd-5.*
letmeinfwd-5.0.0
letmeinfwd-5.1.0
letmeinfwd-6.*
letmeinfwd-6.0.0
letmeinfwd-7.*
letmeinfwd-7.0.0
letmeinfwd-7.1.0
letmeinfwd-7.2.0
letmeinfwd-8.*
letmeinfwd-8.0.0
letmeinfwd-9.*
letmeinfwd-9.0.0

Database specific

source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2025-52570.json"