{"id":"CVE-2025-52570","state":"PUBLISHED","title":"Letmein connection limiter allows an arbitrary amount of simultaneous connections","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.","publishedAt":"2025-06-24T03:13:29.370Z","updatedAt":"2025-06-24T14:42:51.785Z","severity":{"score":1.7,"label":"Low","version":"4.0","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","source":"GitHub_M"},"assigner":"GitHub_M","products":["mbuesch letmein"],"affected":[{"vendor":"mbuesch","product":"letmein","versions":[{"version":"< 10.2.1","status":"affected"}]}],"references":["https://github.com/mbuesch/letmein/security/advisories/GHSA-jpv7-p47h-f43j","https://github.com/mbuesch/letmein/commit/43207cd77580410d97165d1e3c07361ba6f3558c"],"weaknesses":["CWE-799","CWE-770"],"ingestedAt":"2026-10-29T20:09:31.862Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2025/52xxx/CVE-2025-52570.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.1","cveMetadata":{"cveId":"CVE-2025-52570","state":"PUBLISHED","datePublished":"2025-06-24T03:13:29.370Z","dateUpdated":"2025-06-24T14:42:51.785Z","assignerShortName":"GitHub_M","assignerOrgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateReserved":"2025-06-18T03:55:52.036Z"},"containers":{"cna":{"title":"Letmein connection limiter allows an arbitrary amount of simultaneous connections","descriptions":[{"lang":"en","value":"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."}],"affected":[{"vendor":"mbuesch","product":"letmein","versions":[{"version":"< 10.2.1","status":"affected"}]}],"references":[{"url":"https://github.com/mbuesch/letmein/security/advisories/GHSA-jpv7-p47h-f43j","name":"https://github.com/mbuesch/letmein/security/advisories/GHSA-jpv7-p47h-f43j","tags":["x_refsource_CONFIRM"]},{"url":"https://github.com/mbuesch/letmein/commit/43207cd77580410d97165d1e3c07361ba6f3558c","name":"https://github.com/mbuesch/letmein/commit/43207cd77580410d97165d1e3c07361ba6f3558c","tags":["x_refsource_MISC"]}],"metrics":[{"cvssV4_0":{"attackVector":"NETWORK","attackComplexity":"LOW","attackRequirements":"PRESENT","privilegesRequired":"NONE","userInteraction":"NONE","vulnConfidentialityImpact":"NONE","vulnIntegrityImpact":"NONE","vulnAvailabilityImpact":"LOW","subConfidentialityImpact":"NONE","subIntegrityImpact":"NONE","subAvailabilityImpact":"NONE","baseScore":1.7,"baseSeverity":"LOW","vectorString":"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","version":"4.0"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-799","lang":"en","description":"CWE-799: Improper Control of Interaction Frequency","type":"CWE"}]},{"descriptions":[{"cweId":"CWE-770","lang":"en","description":"CWE-770: Allocation of Resources Without Limits or Throttling","type":"CWE"}]}],"providerMetadata":{"shortName":"GitHub_M","orgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateUpdated":"2025-06-24T03:13:29.370Z"},"source":{"advisory":"GHSA-jpv7-p47h-f43j","discovery":"UNKNOWN"}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2025-06-24T14:41:41.688686Z","id":"CVE-2025-52570","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2025-06-24T14:42:51.785Z"}}]}}}