CVE-2021-41379
Confirmed PUBLISHEDWindows Installer Elevation of Privilege Vulnerability
Recommended Action
Prioritize remediation. Validate affected assets and apply vendor fixes on an accelerated timeline.
At a Glance
Windows Installer Elevation of Privilege Vulnerability
- CVE Published
- Nov 10, 2021
- Exploitation Reported
- Mar 03, 2022
- CVSS
- 5.5 Medium
- EPSS
- —
Affected Versions
27 version rows · page 1 of 2
| Vendor | Product | Version | Status |
|---|---|---|---|
| Microsoft |
Windows 10 Version 1809
|
10.0.0 to < 10.0.17763.2300 |
Affected |
| Microsoft |
Windows Server 2019
|
10.0.0 to < 10.0.17763.2300 |
Affected |
| Microsoft |
Windows Server 2019 (Server Core installation)
|
10.0.0 to < 10.0.17763.2300 |
Affected |
| Microsoft |
Windows 10 Version 1909
|
10.0.0 to < 10.0.18363.1916 |
Affected |
| Microsoft |
Windows 10 Version 21H1
|
10.0.0 to < 10.0.19043.1348 |
Affected |
| Microsoft |
Windows Server 2022
|
10.0.0 to < 10.0.20348.350 |
Affected |
| Microsoft |
Windows 10 Version 2004
|
10.0.0 to < 10.0.19041.1348 |
Affected |
| Microsoft |
Windows Server version 2004
|
10.0.0 to < 10.0.19041.1348 |
Affected |
| Microsoft |
Windows 10 Version 20H2
|
10.0.0 to < 10.0.19042.1348 |
Affected |
| Microsoft |
Windows Server version 20H2
|
10.0.0 to < 10.0.19042.1348 |
Affected |
| Microsoft |
Windows 11 version 21H2
|
10.0.0 to < 10.0.22000.318 |
Affected |
| Microsoft |
Windows 10 Version 1507
|
10.0.0 to < 10.0.10240.19119 |
Affected |
| Microsoft |
Windows 10 Version 1607
|
10.0.0 to < 10.0.14393.4770 |
Affected |
| Microsoft |
Windows Server 2016
|
10.0.0 to < 10.0.14393.4770 |
Affected |
| Microsoft |
Windows Server 2016 (Server Core installation)
|
10.0.0 to < 10.0.14393.4770 |
Affected |
| Microsoft |
Windows 7
|
6.1.0 to < 6.1.7601.25769 |
Affected |
| Microsoft |
Windows 7 Service Pack 1
|
6.1.0 to < 6.1.7601.25769 |
Affected |
| Microsoft |
Windows 8.1
|
6.3.0 to < 6.3.9600.20174 |
Affected |
| Microsoft |
Windows Server 2008 Service Pack 2
|
6.0.0 to < 6.0.6003.21282 |
Affected |
| Microsoft |
Windows Server 2008 Service Pack 2 (Server Core installation)
|
6.0.0 to < 6.0.6003.21282 |
Affected |
| Microsoft |
Windows Server 2008 Service Pack 2
|
6.0.0 to < 6.0.6003.21282 |
Affected |
| Microsoft |
Windows Server 2008 R2 Service Pack 1
|
6.1.0 to < 6.1.7601.25769 |
Affected |
| Microsoft |
Windows Server 2008 R2 Service Pack 1 (Server Core installation)
|
6.0.0 to < 6.1.7601.25769 |
Affected |
| Microsoft |
Windows Server 2012
|
6.2.0 to < 6.2.9200.23517 |
Affected |
| Microsoft |
Windows Server 2012 (Server Core installation)
|
6.2.0 to < 6.2.9200.23517 |
Affected |
CVE References
- portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-41379 portal.msrc.microsoft.com · CVE Record https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CV...
- zerodayinitiative.com/advisories/ZDI-21-1308 zerodayinitiative.com · CVE Record https://www.zerodayinitiative.com/advisories/ZDI-21-1308/
Recommended Actions
- Prioritize remediation. Validate affected assets and apply vendor fixes on an accelerated timeline.
- Use the Pro API to automate enrichment, telemetry, and workflow delivery for VM, SOC, and CTI pipelines.
Known Exploited Vulnerability Sources
Catalogues that list this CVE as a known exploited vulnerability.
Per-source evidence links for KEV attestations are available through the KEVIntel Pro API.
Learn about Pro API access| Source | Added |
|---|---|
| CISA First | 2022-03-03 00:00 UTC |
No detection artifacts or sensor request patterns are available for this CVE yet.
Check back as sensor telemetry and scanner integrations are updated.
Virtual Patch
Compensating WAF rules to help reduce exposure to this CVE. Rule content and deployable vendor exports are available with KEVIntel Enterprise.
KEVIntel does not currently have a virtual patch for this CVE. When available, KEVIntel virtual patches ship as deployable ModSecurity, Cloudflare, and AWS WAF rules.
Enterprise feature. Virtual patch rule content and deployable vendor exports (ModSecurity, Cloudflare, AWS WAF) are available to KEVIntel Enterprise users.
CVSS Scores
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
Exploitation Status
Exploited in the wild
Recorded 2022-03-03 00:00:00 UTC · CISA
Used in malware
Recorded 2022-03-03 00:00:00 UTC · CISA
Weaknesses (CWE)
-
Improper Link Resolution Before File Access ('Link Following')
Timeline
Key exploitation, disclosure, scanner coverage, and KEV attestation events for this CVE.
-
00:00 UTC over 4 years ago00:00 UTC · over 4 years ago
Added to CISA KEV
Listed in the CISA Known Exploited Vulnerabilities catalog
-
00:00 UTC over 4 years ago00:00 UTC · over 4 years ago
First public exploitation report
Exploit observed in malware
-
00:46 UTC over 4 years ago00:46 UTC · over 4 years ago
CVE published
Vulnerability disclosed publicly
-
00:00 UTC almost 5 years ago00:00 UTC · almost 5 years ago
CVE ID reserved
Identifier reserved by the CNA
Automate This Intelligence with the Pro API
Confidence scoring, exploit status, sensor telemetry, PoCs, scanner integrations, mentions, and tags are available programmatically for VM, SOC, and CTI workflows.
Pro API Example
GET /api/v2/pro/kevs/CVE-2021-41379
{
"cve_id": "CVE-2021-41379",
"title": "Windows Installer Elevation of Privilege Vulnerability",
"affected_vendor": "Microsoft",
"affected_product": "Windows 10 Version 1809, Windows Server 2019, Windows Server 2019 (Server Core installation), Windows 10 Version 1909, Windows 10 Version 21H1, Windows Server 2022, Windows 10 Version 2004, Windows Server version 2004, Windows 10 Version 20H2, Windows Server version 20H2, Windows 11 version 21H2, Windows 10 Version 1507, Windows 10 Version 1607, Windows Server 2016, Windows Server 2016 (Server Core installation), Windows 7, Windows 7 Service Pack 1, Windows 8.1, Windows Server 2008 Service Pack 2, Windows Server 2008 Service Pack 2 (Server Core installation), Windows Server 2008 Service Pack 2, Windows Server 2008 R2 Service Pack 1, Windows Server 2008 R2 Service Pack 1 (Server Core installation), Windows Server 2012, Windows Server 2012 (Server Core installation), Windows Server 2012 R2, Windows Server 2012 R2 (Server Core installation)",
"affected_versions": [
{ "vendor": "...", "product": "...", "status": "affected", "display_label": "..." }
],
"confidence": "Confirmed",
"cvss_score": 5.5,
"epss_score": null,
"exploit_status": {
"exploited_in_the_wild": true,
"active_exploitation_observed": false
},
"sensor_telemetry": { "...": "Pro API fields" },
"proof_of_concepts": [ "..." ],
"scanner_integrations": [ "..." ]
}