CVE-2022-24521: Microsoft Windows CLFS Driver Privilege Escalation Vulnerability

Is it exploited?

Yes. CISA added it to the Known Exploited Vulnerabilities catalog on 13 Apr 2022, 2 days before the CVE record was published.

How likely is exploitation in the next 30 days?

7.1%

EPSS score, percentile 94.2 of all scored records

How severe?

7.8 High

CVSS v3.1 base score, given by the CNA

What should I do?

Required action (CISA), due 4 May 2022: Apply updates per vendor instructions.

Advisories and patches (1)

Which versions are affected?

Affected: 10.0.17763.0 up to, not including, 10.0.17763.2803; 10.0.0 up to, not including, 10.0.17763.2803; 10.0.17763.0 up to, not including, 10.0.17763.2803; 10.0.17763.0 up to, not including, 10.0.17763.2803; 10.0.0 up to, not including, 10.0.18363.2212; 10.0.0 up to, not including, 10.0.19043.1645; 10.0.20348.0 up to, not including, 10.0.20348.643; 10.0.0 up to, not including, 10.0.19042.1645; 10.0.0 up to, not including, 10.0.19042.1645; 10.0.0 up to, not including, 10.0.22000.613; 10.0.19043.0 up to, not including, 10.0.19044.1645; 10.0.10240.0 up to, not including, 10.0.10240.19265; 10.0.14393.0 up to, not including, 10.0.14393.5066; 10.0.14393.0 up to, not including, 10.0.14393.5066; 10.0.14393.0 up to, not including, 10.0.14393.5066; 6.1.0 up to, not including, 6.1.7601.25924; 6.1.0 up to, not including, 6.1.7601.25924; 6.3.0 up to, not including, 6.3.9600.20337; 6.0.6003.0 up to, not including, 6.0.6003.21446; 6.0.6003.0 up to, not including, 6.0.6003.21446

Versions by product

Source: CISA Known Exploited Vulnerabilities (KEV) catalog, 2026.10.28, as of 28 Oct 2026; FIRST Exploit Prediction Scoring System (EPSS), v2026.06.15, as of 28 Oct 2026; CVE List V5 (CVE Program), cve_2026-10-28_0000Z, as of 28 Oct 2026. About the data.

What to do

CISA due date for this action: 4 May 2022.

Advisories and patches

• Windows Common Log File System Driver Elevation of Privilege Vulnerability (Vendor advisory)

Linked from CISA's catalog entry

• https://nvd.nist.gov/vuln/detail/CVE-2022-24521

Affected products and versions

As listed in the CVE record.

Source: CVE List V5 (CVE Program), cve_2026-10-28_0000Z, as of 28 Oct 2026. About the data.

About this vulnerability

Microsoft Windows Common Log File System (CLFS) Driver contains an unspecified vulnerability that allows for privilege escalation.

Summary: CISA's KEV catalog, as of 28 Oct 2026.

• CISA added CVE-2022-24521 to its Known Exploited Vulnerabilities (KEV) catalog on 13 Apr 2022.
• CISA marks it as known to be used in ransomware campaigns.
• The due date CISA sets for the required action is 4 May 2022.
• The CVE record was published on 15 Apr 2022, 2 days after it was added to KEV.
• The CVE record carries a CVSS v3.1 base score of 7.8 (High), given by its CNA.
• FIRST's EPSS model puts the probability of exploitation in the next 30 days at 7.1% (percentile 94.2), as of 28 Oct 2026.
• CISA's SSVC assessment in the CVE record: exploitation active, automatable no, technical impact total.

Source: CISA Known Exploited Vulnerabilities (KEV) catalog, 2026.10.28, as of 28 Oct 2026; CVE List V5 (CVE Program), cve_2026-10-28_0000Z, as of 28 Oct 2026; FIRST Exploit Prediction Scoring System (EPSS), v2026.06.15, as of 28 Oct 2026. About the data.

Description

Windows Common Log File System Driver Elevation of Privilege Vulnerability

Windows Common Log File System Driver Elevation of Privilege Vulnerability

Source: CVE List V5 (CVE Program), cve_2026-10-28_0000Z, as of 28 Oct 2026. About the data.

Weakness

• CWE-787: Out-of-bounds Write
• CWE-1285

CWE and CAPEC are maintained by MITRE; the entries are those named in the CVE record and the KEV entry.

Timeline

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