{"cve":"CVE-2021-3310","nvd":{"published":"2021-03-10T05:15:13.517","modified":"2026-06-17T04:04:55.107","status":"Modified","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).","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","score":7.8},"cwes":["CWE-59"],"references":["https://www.westerndigital.com/support/productsecurity/wdc-21002-my-cloud-firmware-version-5-10-122","https://www.zerodayinitiative.com/advisories/ZDI-21-277/","https://www.westerndigital.com/support/productsecurity/wdc-21002-my-cloud-firmware-version-5-10-122","https://www.zerodayinitiative.com/advisories/ZDI-21-277/"],"products":["westerndigital:my_cloud_os"],"source":"nvd","synced_at":"2026-10-19T21:15:50.279857260+00:00"},"epss":{"cve":"CVE-2021-3310","score":0.01008,"percentile":0.63064,"date":"2026-10-31"},"kev":null,"osv":[],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}