{"id":"CVE-2021-3310","aliases":["EUVD-2021-26644","GHSA-vxf7-jpg6-xh49"],"status":"published","title":"Western Digital My Cloud OS 5 devices before 5.10.122 mishandle Symbolic Link Following on SMB...","description":"Western Digital My Cloud OS 5 devices before 5.10.122 mishandle Symbolic Link Following on SMB and AFP shares. This can lead to code execution and information disclosure (by reading local files).","severity":{"version":"3.1","score":7.8,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","level":"high","assessor":"primary","from":"nvd"},"epss":{"day":"2026-11-09","score":0.01008,"percentile":0.63293,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":true,"fix_available":false},"cwes":["CWE-59"],"published":"2021-03-10T04:55:35Z","modified":"2026-06-17T04:04:55Z","exploits":[{"source":"pocgithub","id":"piffd0s/CVE-2021-3310","title":"piffd0s/CVE-2021-3310","date":"2021-05-24","url":"https://github.com/piffd0s/CVE-2021-3310"}],"products":[{"vendor":"westerndigital","product":"my_cloud_os"}],"references":[{"url":"https://www.westerndigital.com/support/productsecurity/wdc-21002-my-cloud-firmware-version-5-10-122","tags":["x_refsource_MISC","x_transferred","Vendor Advisory"]},{"url":"https://www.zerodayinitiative.com/advisories/ZDI-21-277/","tags":["x_refsource_MISC","x_transferred","Third Party Advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2021-3310"},{"url":"https://github.com/advisories/GHSA-vxf7-jpg6-xh49"}],"sources":{"cve":[{"id":"CVE-2021-3310","description":"Western Digital My Cloud OS 5 devices before 5.10.122 mishandle Symbolic Link Following on SMB and AFP shares. This can lead to code execution and information disclosure (by reading local files).","status":"published","published":"2021-03-10T04:55:35Z","modified":"2024-08-03T16:53:17.409Z","updated_at":"2026-11-02T14:33:04.020035Z"}],"euvd":[{"id":"EUVD-2021-26644","description":"Western Digital My Cloud OS 5 devices before 5.10.122 mishandle Symbolic Link Following on SMB and AFP shares. This can lead to code execution and information disclosure (by reading local files).","status":"published","published":"2021-03-10T04:55:35Z","modified":"2024-08-03T16:53:17Z","updated_at":"2026-11-03T03:25:13.531128Z"}],"ghsa":[{"id":"GHSA-vxf7-jpg6-xh49","title":"Western Digital My Cloud OS 5 devices before 5.10.122 mishandle Symbolic Link Following on SMB...","description":"Western Digital My Cloud OS 5 devices before 5.10.122 mishandle Symbolic Link Following on SMB and AFP shares. This can lead to code execution and information disclosure (by reading local files).","status":"published","published":"2022-05-24T17:44:14Z","modified":"2023-01-29T05:05:59Z","cwes":["CWE-59"],"updated_at":"2026-11-02T14:45:55.193009Z"}],"nvd":[{"id":"CVE-2021-3310","description":"Western Digital My Cloud OS 5 devices before 5.10.122 mishandle Symbolic Link Following on SMB and AFP shares. This can lead to code execution and information disclosure (by reading local files).","status":"published","published":"2021-03-10T05:15:13.517Z","modified":"2026-06-17T04:04:55.107Z","cvss":[{"version":"3.1","score":7.8,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","level":"high","assessor":"primary"},{"version":"2.0","score":4.6,"vector":"AV:L/AC:L/Au:N/C:P/I:P/A:P","level":"medium","assessor":"primary"}],"cwes":["CWE-59"],"updated_at":"2026-11-02T14:06:50.399901Z"}]}}