{"url":"http://public2.vulnerablecode.io/api/packages/345421?format=json","purl":"pkg:apk/alpine/syncthing@1.15.1-r0?arch=armhf&distroversion=v3.21&reponame=community","type":"apk","namespace":"alpine","name":"syncthing","version":"1.15.1-r0","qualifiers":{"arch":"armhf","distroversion":"v3.21","reponame":"community"},"subpath":"","is_vulnerable":false,"next_non_vulnerable_version":null,"latest_non_vulnerable_version":null,"affected_by_vulnerabilities":[],"fixing_vulnerabilities":[{"url":"http://public2.vulnerablecode.io/api/vulnerabilities/101835?format=json","vulnerability_id":"VCID-2g3d-77m4-qubh","summary":"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.","references":[{"reference_url":"https://api.first.org/data/v1/epss?cve=CVE-2021-21404","reference_id":"","reference_type":"","scores":[{"value":"0.00251","scoring_system":"epss","scoring_elements":"0.4872","published_at":"2026-06-05T12:55:00Z"},{"value":"0.00251","scoring_system":"epss","scoring_elements":"0.48659","published_at":"2026-06-04T12:55:00Z"}],"url":"https://api.first.org/data/v1/epss?cve=CVE-2021-21404"},{"reference_url":"https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-21404","reference_id":"","reference_type":"","scores":[],"url":"https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-21404"},{"reference_url":"https://github.com/syncthing/syncthing/commit/fb4fdaf4c0a79c22cad000c42ac1394e3ccb6a97","reference_id":"","reference_type":"","scores":[{"value":"7.5","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"},{"value":"LOW","scoring_system":"generic_textual","scoring_elements":""}],"url":"https://github.com/syncthing/syncthing/commit/fb4fdaf4c0a79c22cad000c42ac1394e3ccb6a97"},{"reference_url":"https://github.com/syncthing/syncthing/releases/tag/v1.15.0","reference_id":"","reference_type":"","scores":[{"value":"7.5","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"},{"value":"LOW","scoring_system":"generic_textual","scoring_elements":""}],"url":"https://github.com/syncthing/syncthing/releases/tag/v1.15.0"},{"reference_url":"https://github.com/syncthing/syncthing/security/advisories/GHSA-x462-89pf-6r5h","reference_id":"","reference_type":"","scores":[{"value":"7.5","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"},{"value":"LOW","scoring_system":"generic_textual","scoring_elements":""}],"url":"https://github.com/syncthing/syncthing/security/advisories/GHSA-x462-89pf-6r5h"},{"reference_url":"https://nvd.nist.gov/vuln/detail/CVE-2021-21404","reference_id":"","reference_type":"","scores":[{"value":"7.5","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"},{"value":"LOW","scoring_system":"generic_textual","scoring_elements":""}],"url":"https://nvd.nist.gov/vuln/detail/CVE-2021-21404"},{"reference_url":"https://pkg.go.dev/github.com/syncthing/syncthing","reference_id":"","reference_type":"","scores":[{"value":"7.5","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"},{"value":"LOW","scoring_system":"generic_textual","scoring_elements":""}],"url":"https://pkg.go.dev/github.com/syncthing/syncthing"},{"reference_url":"https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=986593","reference_id":"986593","reference_type":"","scores":[],"url":"https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=986593"},{"reference_url":"https://security.archlinux.org/AVG-1778","reference_id":"AVG-1778","reference_type":"","scores":[{"value":"Medium","scoring_system":"archlinux","scoring_elements":""}],"url":"https://security.archlinux.org/AVG-1778"}],"fixed_packages":[{"url":"http://public2.vulnerablecode.io/api/packages/345421?format=json","purl":"pkg:apk/alpine/syncthing@1.15.1-r0?arch=armhf&distroversion=v3.21&reponame=community","is_vulnerable":false,"affected_by_vulnerabilities":[],"resource_url":"http://public2.vulnerablecode.io/packages/pkg:apk/alpine/syncthing@1.15.1-r0%3Farch=armhf&distroversion=v3.21&reponame=community"}],"aliases":["CVE-2021-21404","GHSA-x462-89pf-6r5h"],"risk_score":3.4,"exploitability":"0.5","weighted_severity":"6.8","resource_url":"http://public2.vulnerablecode.io/vulnerabilities/VCID-2g3d-77m4-qubh"}],"risk_score":null,"resource_url":"http://public2.vulnerablecode.io/packages/pkg:apk/alpine/syncthing@1.15.1-r0%3Farch=armhf&distroversion=v3.21&reponame=community"}