{"cve":"CVE-2021-36934","nvd":{"published":"2021-07-22T07:15:11.013","modified":"2026-08-10T20:19:00.610","status":"Analyzed","description":"An elevation of privilege vulnerability exists because of overly permissive Access Control Lists (ACLs) on multiple system files, including the Security Accounts Manager (SAM) database. An attacker who successfully exploited this vulnerability could run arbitrary code with SYSTEM privileges. An attacker could then install programs; view, change, or delete data; or create new accounts with full user rights.\nAn attacker must have the ability to execute code on a victim system to exploit this vulnerability.\nAfter installing this security update, you must manually delete all shadow copies of system files, including the SAM database, to fully mitigate this vulnerabilty. Simply installing this security update will not fully mitigate this vulnerability. See KB5005357- Delete Volume Shadow Copies.","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":[],"references":["https://msrc.microsoft.com/update-guide/vulnerability/CVE-2021-36934","http://packetstormsecurity.com/files/164006/HiveNightmare-AKA-SeriousSAM.html","https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-36934","https://www.kb.cert.org/vuls/id/506989","https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-36934"],"products":["microsoft:windows_10_1809","microsoft:windows_10_1909","microsoft:windows_10_2004","microsoft:windows_10_20h2","microsoft:windows_10_21h1"],"source":"nvd","synced_at":"2026-10-19T21:21:13.713336758+00:00"},"epss":{"cve":"CVE-2021-36934","score":0.67252,"percentile":0.99301,"date":"2026-10-31"},"kev":{"cve":"CVE-2021-36934","date_added":"2022-02-10","due_date":"2022-02-24","vendor":"Microsoft","product":"Windows","known_ransomware":false},"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."]}