Vulnerability in Microsoft Windows 10 1809
CVE-2021-36934
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. An attacker must have the ability to execute code on a victim system to exploit this vulnerability. After 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.
EPSS: 0.673 (99.2th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 7.8 (High). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.
Affected products
- Microsoft Windows_10_1809
- Microsoft Windows_10_1909
- Microsoft Windows_10_2004
- Microsoft Windows_10_20h2
- Microsoft Windows_10_21h1
- Microsoft Windows 10 Version 1809 — versions 10.0.0, 10.0.17763.0
- Microsoft Windows 10 Version 1909 — versions 10.0.0
- Microsoft Windows 10 Version 2004 — versions 10.0.0
- Microsoft Windows 10 Version 20h2 — versions 10.0.0
- Microsoft Windows 10 Version 21h1 — versions 10.0.0
CISA KEV (Known Exploited Vulnerabilities)
This CVE is on the CISA KEV catalog, added on . CISA KEV inclusion means CISA has confirmed in-the-wild exploitation; US federal agencies are required to remediate within a published due date.
BOD 22-01 due date: .
Required action: Apply updates per vendor instructions.
Public proof-of-concept exploits
References
- af854a3a-2127-422b-91ae-364da2661108 (Patch, x_refsource_MISC, Vendor Advisory)
- af854a3a-2127-422b-91ae-364da2661108 (x_refsource_MISC, Third Party Advisory, VDB Entry)
- af854a3a-2127-422b-91ae-364da2661108 (Third Party Advisory)
- 134c704f-9b21-4f2e-91b3-4a467353bcc0 (US Government Resource)
- secure@microsoft.com (vendor-advisory, Patch, patch, Vendor Advisory)
Frequently asked questions
- What is CVE-2021-36934?
- CVE-2021-36934 is a high-severity vulnerability in Microsoft Windows 10 1809. CVSS score: 7.8/10. Published 2021-07-22.
- How severe is CVE-2021-36934?
- High severity. CVSS v3 base score is 7.8 out of 10.
- Is CVE-2021-36934 known to be exploited?
- Yes. CVE-2021-36934 is listed in the CISA Known Exploited Vulnerabilities catalog (added 2022-02-10), indicating it is being actively exploited. 154 public proof-of-concept repositories are indexed.