CVE-2021-43226

Windows Common Log File System Driver Elevation of Privilege Vulnerability

CVSS 7.8 (HIGH) KEV: KNOWN CATALOG

Attention and evidence

HYPE SCORE

0.0/10

REALITY · THREAT PRIORITY

8.2/10

General review priority; not probability

Evidence confidence: Exploitation recorded

Why this priority?

Recorded exploitation baseline: +7.00
Technical severity: CVSS 7.8: +1.17
Fresh EPSS: 3.28%: +0.02

General review priority, not probability, victim count or asset-specific risk. A range covers missing CVSS/EPSS inputs within the current evidence state.

Sources: 5 documents and public datasets.

Hype components

Headline sample (25%)

0/100

Press, 30 days (60%)

0/100

Grounded branding (15%)

0/100

HYPE TOTAL0/100

Sources and documents

Recorded Future

Press · 06 Nov 2025, 08:00 · October 2025 CVE Landscape: 32 High-Impact Vulnerabilities Demand Immediate Attention - Recorded Future

CyberSecurityNews

Press · 07 Oct 2025, 07:00 · CISA Warns of Windows Privilege Escalation Vulnerability Exploited in Attacks - CyberSecurityNews

BleepingComputer

Press · 14 Dec 2021, 08:00 · Microsoft December 2021 Patch Tuesday fixes 6 zero-days, 67 flaws - BleepingComputer

BleepingComputer

Press · 14 Dec 2021, 08:00 · Microsoft December 2021 Patch Tuesday fixes 6 zero-days, 67 flaws - BleepingComputer

Sophos

Press · 14 Dec 2021, 08:00 · Microsoft wraps up 2021 with 64 patched vulnerabilities—including Windows 7 fixes - Sophos

Score evolution

● Hype ● Reality

Earlier evidence-support scores are retained in history; this chart shows only the current priority definition.

First record: hype 0.0 · reality 8.2 (2026-11-02 15:12). The curve appears once the score changes.

Public exploit evidence

Public exploit entries / repo candidates

Evidence context and dated references

Reality is general threat/review priority, combining observed exploitation, CVSS severity and fresh EPSS. Evidence confidence is separate. This is not calibrated risk, a victim count or an asset-specific assessment. A range reflects missing numeric inputs.

Evidence in context

Confidence in exploitation evidence: Exploitation recorded
Priority basis: Recorded exploitation; CVSS 7.8; EPSS 3.3%
Attention, last 30 days: 0 distinct story titles; 0 press documents; 0 publisher domains.
Technical potential: local access, low privileges, no user interaction.
Observed activity: Exploitation recorded in CISA KEV.
Known scale: Not quantified.
Evidence confidence basis: Trusted exploitation confirmation

Score evaluated: 2026-11-05 13:58:31.036516+00:00 · EPSS snapshot: 2026-11-05T12:03:04Z

Source event timeline

First press mention

14 Dec 2021, 08:00

Published

15 Dec 2021, 14:15

Added to the CISA KEV catalog

06 Oct 2025, 00:00

Latest press mention

06 Nov 2025, 08:00

Score calculated

05 Nov 2026, 13:58