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CVE-2021-43226 CISA KEV · Actively exploitedLinked to ransomware

Windows Common Log File System Driver Elevation of Privilege Vulnerability

CVSS score

7.8

EPSS probability

%3.3

Risk score

0.5

Published

4 y ago

OverviewPublic Exploits (0)NewsroomVulnerability Timeline
Official patch verified

Etkilenen ürün ve sürüm için yayımlanan güvenlik güncellemesini uygulayın.

Impact on My Inventory

Only the personal products you have added to your account are assessed; an organisation's inventory does not appear here.

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Vulnerability description

DayBreach CVE AI Research

CVE-2021-43226 has vendor, distribution, patch and security-source records on file. We can compare them and prepare an explanation linked to the evidence.

Windows Common Log File System Driver Elevation of Privilege Vulnerability

IMPACT: Affected Products and Software

Affected Products

The following products are affected by CVE-2021-43226 vulnerability. Where our threat engine knows the exact affected versions, they are listed below.

IDVENDORPRODUCTACTION
1microsoftWindows 10 Version 1809 View
2microsoftwindows server 2019 View
3microsoftWindows Server 2019 (Server Core installation) View
4microsoftWindows 10 Version 1909 View
5microsoftWindows 10 Version 21H1 View
6microsoftwindows server 2022 View
7microsoftWindows 10 Version 2004 View
8microsoftWindows Server version 2004 View
9microsoftWindows 10 Version 20H2 View
10microsoftWindows Server version 20H2 View
11microsoftWindows 11 version 21H2 View
12microsoftWindows 10 Version 21H2 View
13microsoftWindows 10 Version 1507 View
14microsoftWindows 10 Version 1607 View
15microsoftwindows server 2016 View
16microsoftWindows Server 2016 (Server Core installation) View
17microsoftWindows 7 View
18microsoftWindows 7 Service Pack 1 View
19microsoftWindows 8.1 View
20microsoftWindows Server 2008 Service Pack 2 View
21microsoftWindows Server 2008 Service Pack 2 (Server Core installation) View
22microsoftWindows Server 2008 R2 Service Pack 1 View
23microsoftWindows Server 2008 R2 Service Pack 1 (Server Core installation) View
24microsoftwindows server 2012 View
25microsoftWindows Server 2012 (Server Core installation) View
26microsoftWindows Server 2012 R2 View
27microsoftWindows Server 2012 R2 (Server Core installation) View
28microsoftwindows 10 1507 View
29microsoftwindows 10 1607 View
30microsoftwindows 10 1809 View
31microsoftwindows 10 1909 View
32microsoftwindows 10 2004 View
33microsoftwindows 10 20h2 View
34microsoftwindows 10 21h1 View
35microsoftwindows 10 21h2 View
36microsoftwindows 11 21h2 View
37microsoftWindows 7 View
38microsoftWindows 8.1 View
39microsoftwindows rt 8.1 View
40microsoftwindows server 2004 View
41microsoftwindows server 2008 View
42microsoftwindows server 2008 View
43microsoftwindows server 2012 View
44microsoftwindows server 2012 View
45microsoftwindows server 2016 View
46microsoftwindows server 2019 View
47microsoftwindows server 2022 View
48microsoftwindows server 20h2 View
Total affected vendors: 1|Products: 48

RED HAT CSAF/VEX: Product Impact Check

Red Hat has not yet published a CSAF/VEX impact record for this CVE. This does not mean “not affected”.

SCORING: CVSS from Multiple Sources

CVSS Scores

The Common Vulnerability Scoring System is a standardised framework for assessing the severity of vulnerabilities in software and systems. We collect and display CVSS scores from several sources for each CVE.

SCOREVERSIONSEVERITYVECTORSOURCE
7.8CVSS V3_1HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:CCVE CNA
7.8CVSS V31HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:HNVD
4.6CVSS V2—AV:L/AC:L/Au:N/C:P/I:P/A:PNVD

Patch and Remediation Guide

Solution & Remediation Advisory

Patch verified

1 doğrulanmış yama veya düzeltilmiş sürüm kanıtı bulundu.

nvd

NVD tarafından Patch olarak etiketlenmiş referans

Open source
canonical

Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.

Confirm the affected product and version against the source evidence above.
Restrict access to internet-facing services and apply network segmentation.
Apply the official update named in the evidence only to the matching product and version.
Monitor server logs and network endpoints for signs of anomalous execution.

Public exploit and active exploitation status

Verified exploit intelligence

This CVE is marked as actively exploited in the CISA KEV catalogue, but no verified, downloadable public PoC or Metasploit module has been found yet. Evidence of active exploitation does not mean that public exploit code exists.

Weakness Classification and Attack Patterns (CWE & CAPEC)

CWE - Common Weakness Enumeration

While CVE identifies specific instances of vulnerabilities, CWE categorises the common flaws or weaknesses that can lead to vulnerabilities. CVE-2021-43226 is associated with the following CWEs:

CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')CWE-20: Improper Input Validation

Common Attack Pattern Enumeration and Classification (CAPEC)

Common Attack Pattern Enumeration and Classification (CAPEC) stores attack patterns, which are descriptions of the common attributes and approaches employed by adversaries to exploit the CVE-2021-43226 weaknesses.

CAPEC-66: SQL InjectionCAPEC-126: Path TraversalCAPEC-28: OS Command Injection

Attack Vector and Accessibility

ExposureYerel erişim
PermissionsLow
UserGerekmiyor

Official Sources and Advisories

https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-43226vendor-advisoryhttps://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-43226nvdCISA Known Exploited Vulnerabilities Catalogkev

CVSS Vector Radar Chart

7.8 / 10
Attack VectorLocalComplexityLowPrivilegesLowUser Interact.NoneConfidentialityLowIntegrityNoneAvailabilityHigh

Vulnerability Scoring Details

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C
Attack VectorLocal
Attack ComplexityLow
Privileges RequiredLow privileges
User InteractionNone required
Confidentiality (Gizlilik)Low
Integrity (Bütünlük)None
Availability (Erişilebilirlik)High

Yama doğrulandı

1 doğrulanmış yama veya düzeltilmiş sürüm kanıtı bulundu.

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