5.5Medium KEV Used in ransomware

CVE-2021-41379Windows Installer Elevation of Privilege Vulnerability

Microsoft Windows 10 Version 1507; Microsoft Windows 10 Version 1607; Microsoft Windows 10 Version 1809; Microsoft Windows 10 Version 1909 Published: 2021-11-10 03:46 (5 years ago)

Known exploited — Microsoft Windows Installer Privilege Escalation Vulnerability

CISA confirmed this vulnerability is used in real attacks on 03.03.2022. Remediation deadline for US federal agencies: 17.03.2022.

Required action: Apply updates per vendor instructions. https://nvd.nist.gov/vuln/detail/CVE-2021-41379

Description

Windows Installer Elevation of Privilege Vulnerability

Weakness (CWE): CWE-59

Data: CVE.org, NVD, CISA KEV, FIRST EPSS, Ubuntu. Published as the sources state it, in English.

Affected products and versions

Vendor	Product	Versions
microsoft	windows 10 1507	10.0.10240.0 – < 10.0.10240.19119
microsoft	windows 10 1607	10.0.14393.0 – < 10.0.14393.4770
microsoft	windows 10 1809	10.0.17763.0 – < 10.0.17763.2300
microsoft	windows 10 1909	10.0.0 – < 10.0.18363.1916
microsoft	windows 10 2004	< 10.0.19041.1348
microsoft	windows 10 20H2	10.0.0 – < 10.0.19042.1348
microsoft	windows 10 21H1	10.0.0 – < 10.0.19043.1348
Microsoft	Windows 10 Version 1507	10.0.10240.0 – < 10.0.10240.19119
Microsoft	Windows 10 Version 1607	10.0.14393.0 – < 10.0.14393.4770
Microsoft	Windows 10 Version 1809	10.0.17763.0 – < 10.0.17763.2300
Microsoft	Windows 10 Version 1909	10.0.0 – < 10.0.18363.1916
Microsoft	Windows 10 Version 2004	10.0.0 – < 10.0.19041.1348
Microsoft	Windows 10 Version 20H2	10.0.0 – < 10.0.19042.1348
Microsoft	Windows 10 Version 21H1	10.0.0 – < 10.0.19043.1348
microsoft	windows 11 21H2	10.0.22000.0 – < 10.0.22000.318
Microsoft	Windows 11 version 21H2	10.0.22000.0 – < 10.0.22000.318
Microsoft	Windows 7	6.1.0 – < 6.1.7601.25769
Microsoft	Windows 7 Service Pack 1	6.1.0 – < 6.1.7601.25769
Microsoft	Windows 8.1	6.3.0 – < 6.3.9600.20174
microsoft	windows rt 8.1	—
microsoft	windows server 2004	10.0.0 – < 10.0.19041.1348
microsoft	windows server 2008	r2
microsoft	windows server 2008 R2	6.1.7601.0 – < 6.1.7601.25769
Microsoft	Windows Server 2008 R2 Service Pack 1	6.1.7601.0 – < 6.1.7601.25769
Microsoft	Windows Server 2008 R2 Service Pack 1 (Server Core installation)	6.1.7601.0 – < 6.1.7601.25769
Microsoft	Windows Server 2008 Service Pack 2	6.0.6003.0 – < 6.0.6003.21282
Microsoft	Windows Server 2008 Service Pack 2 (Server Core installation)	6.0.6003.0 – < 6.0.6003.21282
microsoft	windows server 2008 sp2	6.0.6003.0 – < 6.0.6003.21282
Microsoft	Windows Server 2012	6.2.9200.0 – < 6.2.9200.23517
Microsoft	Windows Server 2012 R2	6.3.9600.0 – < 6.3.9600.20174
Microsoft	Windows Server 2012 R2 (Server Core installation)	6.3.9600.0 – < 6.3.9600.20174
Microsoft	Windows Server 2012 (Server Core installation)	6.2.9200.0 – < 6.2.9200.23517
Microsoft	Windows Server 2016	10.0.14393.0 – < 10.0.14393.4770
Microsoft	Windows Server 2016 (Server Core installation)	10.0.14393.0 – < 10.0.14393.4770
Microsoft	Windows Server 2019	10.0.17763.0 – < 10.0.17763.2300
Microsoft	Windows Server 2019 (Server Core installation)	10.0.17763.0 – < 10.0.17763.2300
Microsoft	Windows Server 2022	10.0.20348.0 – < 10.0.20348.350
microsoft	windows server 20H2	10.0.0 – < 10.0.19042.1348
Microsoft	Windows Server version 2004	10.0.0 – < 10.0.19041.1348
Microsoft	Windows Server version 20H2	10.0.0 – < 10.0.19042.1348

References and patches

Windows Installer Elevation of Privilege Vulnerability vendor-advisorypatchPatchVendor Advisory
https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-41379 PatchVendor Advisory
https://www.zerodayinitiative.com/advisories/ZDI-21-1308/ Third Party AdvisoryVDB Entry
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-41379 US Government Resource

CPE matches (NVD) (20)

cpe:2.3:o:microsoft:windows_10_1507:*:*:*:*:*:*:*:* < 10.0.10240.19119
cpe:2.3:o:microsoft:windows_10_1607:*:*:*:*:*:*:*:* < 10.0.14393.4770
cpe:2.3:o:microsoft:windows_10_1809:*:*:*:*:*:*:*:* < 10.0.17763.2300
cpe:2.3:o:microsoft:windows_10_1909:*:*:*:*:*:*:*:* < 10.0.18363.1916
cpe:2.3:o:microsoft:windows_10_2004:*:*:*:*:*:*:*:* < 10.0.19041.1348
cpe:2.3:o:microsoft:windows_10_20h2:*:*:*:*:*:*:*:* < 10.0.19042.1348
cpe:2.3:o:microsoft:windows_10_21h1:*:*:*:*:*:*:*:* < 10.0.19043.1348
cpe:2.3:o:microsoft:windows_11_21h2:*:*:*:*:*:*:*:* < 10.0.22000.318
cpe:2.3:o:microsoft:windows_7:-:sp1:*:*:*:*:*:*
cpe:2.3:o:microsoft:windows_8.1:-:*:*:*:*:*:*:*
cpe:2.3:o:microsoft:windows_rt_8.1:-:*:*:*:*:*:*:*
cpe:2.3:o:microsoft:windows_server_2004:*:*:*:*:*:*:*:* < 10.0.19041.1348
cpe:2.3:o:microsoft:windows_server_2008:-:sp2:*:*:*:*:*:*
cpe:2.3:o:microsoft:windows_server_2008:r2:sp1:*:*:*:*:x64:*
cpe:2.3:o:microsoft:windows_server_2012:-:*:*:*:*:*:*:*
cpe:2.3:o:microsoft:windows_server_2012:r2:*:*:*:*:*:*:*
cpe:2.3:o:microsoft:windows_server_2016:*:*:*:*:*:*:*:* < 10.0.14393.4770
cpe:2.3:o:microsoft:windows_server_2019:*:*:*:*:*:*:*:* < 10.0.17763.2300
cpe:2.3:o:microsoft:windows_server_2022:*:*:*:*:*:*:*:* < 10.0.20348.350
cpe:2.3:o:microsoft:windows_server_20h2:*:*:*:*:*:*:*:* < 10.0.19042.1348

CVSS score

5.5Medium

Source: microsoft · CVSS 3.1

Attack vector: Local
Attack complexity: Low
Privileges required: Low
User interaction: None
Scope: Unchanged
Confidentiality: None
Integrity: None
Availability: High

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C

All scores (4)

cna	CVSS 3.1	5.5Medium
secure@microsoft.com	CVSS 3.1	5.5Medium
nvd	CVSS 3.1	7.8High
nvd	CVSS 2.0	4.6Medium

EPSS (chance of exploitation in 30 days)

19.45%

higher than 97% of all CVEs

CISA assessment (SSVC)

Exploitation: active
Automatable: no
Technical impact: total

Timeline

ID reserved2021-09-17
Published2021-11-10 03:46
Reached IP-DB2026-10-24 23:33
Added to KEV2022-03-03
Last updated2026-08-19 22:22

Assigned by (CNA): microsoft
NVD status: Analyzed

View at source: CVE.org · NVD

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