{"containers":{"cna":{"affected":[{"product":"syncthing","vendor":"syncthing","versions":[{"status":"affected","version":"< 1.15.0"}]}],"descriptions":[{"lang":"en","value":"Syncthing is a continuous file synchronization program. In Syncthing before version 1.15.0, the relay server `strelaysrv` can be caused to crash and exit by sending a relay message with a negative length field. Similarly, Syncthing itself can crash for the same reason if given a malformed message from a malicious relay server when attempting to join the relay. Relay joins are essentially random (from a subset of low latency relays) and Syncthing will by default restart when crashing, at which point it's likely to pick another non-malicious relay. This flaw is fixed in version 1.15.0."}],"metrics":[{"cvssV3_1":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"HIGH","baseScore":7.5,"baseSeverity":"HIGH","confidentialityImpact":"NONE","integrityImpact":"NONE","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","version":"3.1"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-20","description":"CWE-20 Improper Input Validation","lang":"en","type":"CWE"}]}],"providerMetadata":{"dateUpdated":"2021-04-06T20:00:15.000Z","orgId":"a0819718-46f1-4df5-94e2-005712e83aaa","shortName":"GitHub_M"},"references":[{"tags":["x_refsource_CONFIRM"],"url":"https://github.com/syncthing/syncthing/security/advisories/GHSA-x462-89pf-6r5h"},{"tags":["x_refsource_MISC"],"url":"https://pkg.go.dev/github.com/syncthing/syncthing"},{"tags":["x_refsource_MISC"],"url":"https://github.com/syncthing/syncthing/commit/fb4fdaf4c0a79c22cad000c42ac1394e3ccb6a97"},{"tags":["x_refsource_MISC"],"url":"https://github.com/syncthing/syncthing/releases/tag/v1.15.0"}],"source":{"advisory":"GHSA-x462-89pf-6r5h","discovery":"UNKNOWN"},"title":"Crash due to malformed relay protocol message","x_legacyV4Record":{"CVE_data_meta":{"ASSIGNER":"security-advisories@github.com","ID":"CVE-2021-21404","STATE":"PUBLIC","TITLE":"Crash due to malformed relay protocol message"},"affects":{"vendor":{"vendor_data":[{"product":{"product_data":[{"product_name":"syncthing","version":{"version_data":[{"version_value":"< 1.15.0"}]}}]},"vendor_name":"syncthing"}]}},"data_format":"MITRE","data_type":"CVE","data_version":"4.0","description":{"description_data":[{"lang":"eng","value":"Syncthing is a continuous file synchronization program. In Syncthing before version 1.15.0, the relay server `strelaysrv` can be caused to crash and exit by sending a relay message with a negative length field. Similarly, Syncthing itself can crash for the same reason if given a malformed message from a malicious relay server when attempting to join the relay. Relay joins are essentially random (from a subset of low latency relays) and Syncthing will by default restart when crashing, at which point it's likely to pick another non-malicious relay. This flaw is fixed in version 1.15.0."}]},"impact":{"cvss":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"HIGH","baseScore":7.5,"baseSeverity":"HIGH","confidentialityImpact":"NONE","integrityImpact":"NONE","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","version":"3.1"}},"problemtype":{"problemtype_data":[{"description":[{"lang":"eng","value":"CWE-20 Improper Input Validation"}]}]},"references":{"reference_data":[{"name":"https://github.com/syncthing/syncthing/security/advisories/GHSA-x462-89pf-6r5h","refsource":"CONFIRM","url":"https://github.com/syncthing/syncthing/security/advisories/GHSA-x462-89pf-6r5h"},{"name":"https://pkg.go.dev/github.com/syncthing/syncthing","refsource":"MISC","url":"https://pkg.go.dev/github.com/syncthing/syncthing"},{"name":"https://github.com/syncthing/syncthing/commit/fb4fdaf4c0a79c22cad000c42ac1394e3ccb6a97","refsource":"MISC","url":"https://github.com/syncthing/syncthing/commit/fb4fdaf4c0a79c22cad000c42ac1394e3ccb6a97"},{"name":"https://github.com/syncthing/syncthing/releases/tag/v1.15.0","refsource":"MISC","url":"https://github.com/syncthing/syncthing/releases/tag/v1.15.0"}]},"source":{"advisory":"GHSA-x462-89pf-6r5h","discovery":"UNKNOWN"}}},"adp":[{"providerMetadata":{"orgId":"af854a3a-2127-422b-91ae-364da2661108","shortName":"CVE","dateUpdated":"2024-08-03T18:09:16.158Z"},"title":"CVE Program Container","references":[{"tags":["x_refsource_CONFIRM","x_transferred"],"url":"https://github.com/syncthing/syncthing/security/advisories/GHSA-x462-89pf-6r5h"},{"tags":["x_refsource_MISC","x_transferred"],"url":"https://pkg.go.dev/github.com/syncthing/syncthing"},{"tags":["x_refsource_MISC","x_transferred"],"url":"https://github.com/syncthing/syncthing/commit/fb4fdaf4c0a79c22cad000c42ac1394e3ccb6a97"},{"tags":["x_refsource_MISC","x_transferred"],"url":"https://github.com/syncthing/syncthing/releases/tag/v1.15.0"}]}]},"cveMetadata":{"assignerOrgId":"a0819718-46f1-4df5-94e2-005712e83aaa","assignerShortName":"GitHub_M","cveId":"CVE-2021-21404","datePublished":"2021-04-06T20:00:15.000Z","dateReserved":"2020-12-22T00:00:00.000Z","dateUpdated":"2024-08-03T18:09:16.158Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.1"}