Vulnerability report

High confidence Not in CISA KEV

CVE-2022-21894

Secure Boot Security Feature Bypass Vulnerability

Microsoft / Windows 10 Version 1809 · affected before 10.0.17763.2452

Watch CVE-2022-21894 Browse KEV feed
Severity
CVSS 4.4 · Medium
Confidence
High
Exploit status
—
EPSS
6.8%
First observed
—
Last observed
—

Decision summary

What security teams need to know first

Direct answers before the deeper technical record.

What it is

CVE-2022-21894 is Secure Boot Security Feature Bypass Vulnerability affecting Microsoft Windows 10 Version 1809 and 18 other products.

Is it exploited?

Yes. Previdian tracks this CVE as a known exploited vulnerability. Confidence is high. Also confirmed by third-party sources.

Who is affected?

Microsoft / Windows 10 Version 1809 affected before 10.0.17763.2452.

What should we do?

Prioritize remediation. Validate affected assets and apply vendor fixes on an accelerated timeline.

Overview

Secure Boot Security Feature Bypass Vulnerability

Secure Boot Security Feature Bypass Vulnerability

Microsoft Affected
Windows 10 Version 1809
Before 10.0.17763.2452
Microsoft Affected
Windows Server 2019
Before 10.0.17763.2452
Microsoft Affected
Windows Server 2019 (Server Core installation)
Before 10.0.17763.2452
Microsoft Affected
Windows 10 Version 1909
Before 10.0.18363.2037
Microsoft Affected
Windows 10 Version 21H1
Before 10.0.19043.1466
Microsoft Affected
Windows Server 2022
Before 10.0.20348.469
Microsoft Affected
Windows 10 Version 20H2
Before 10.0.19042.1466
Microsoft Affected
Windows Server version 20H2
Before 10.0.19042.1466
Microsoft Affected
Windows 11 version 21H2
Before 10.0.22000.434
Microsoft Affected
Windows 10 Version 21H2
Before 10.0.19044.1466
Microsoft Affected
Windows 10 Version 1507
Before 10.0.10240.19177
Microsoft Affected
Windows 10 Version 1607
Before 10.0.14393.4886
Microsoft Affected
Windows Server 2016
Before 10.0.14393.4886
Microsoft Affected
Windows Server 2016 (Server Core installation)
Before 10.0.14393.4886
Microsoft Affected
Windows 8.1
Before 6.3.9600.20246
Microsoft Affected
Windows Server 2012
Before 6.2.9200.23584
Microsoft Affected
Windows Server 2012 (Server Core installation)
Before 6.2.9200.23584
Microsoft Affected
Windows Server 2012 R2
Before 6.3.9600.20246
Microsoft Affected
Windows Server 2012 R2 (Server Core installation)
Before 6.3.9600.20246
View vendor advisory (opens in new tab)
Published
11 Jan 2022
Exploitation Reported
11 Jan 2022
Attack vector
Local
Complexity
Low
Privileges
High
User interaction
None

Tags

microsoft windows

CVE References

Exploitation evidence

Why Previdian marks this CVE as exploited

Third-party attestation and first-party sensor observation are shown separately so teams can judge the evidence chain.

No exploitation evidence rows are recorded for this CVE yet.

Known exploited vulnerability sources

Per-source evidence links for KEV attestations are available through the Previdian Pro API.

Learn about Pro API access
Source Added
CVE First 2022-01-11 20:22 UTC

Detection

Operational artifacts and observed signals

Make the evidence actionable in scanner, SOC, and edge-control workflows.

Observed signals

Request targets
User-Agents
Callback hosts
0
0
0

Request targets and User-Agents available in Pro. Callback host details available in Enterprise.

Scanner coverage

No scanner integrations recorded yet.

Virtual patch status

No Previdian virtual patch is currently available. Future rules ship for ModSecurity, Cloudflare, and AWS WAF.

Learn about virtual patches →

No detection artifacts or sensor request patterns are available for this CVE yet.

Check back as sensor telemetry and scanner integrations are updated.

Risk and context

Severity, weaknesses, and research context

CVSS v3.1

4.4 Medium

Potential damage if exploited. Separate from whether attackers are using it.

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

EPSS

6.8%

Estimated chance of exploitation in the next 30 days. Previdian's warning comes from evidence, not this score.

Weaknesses

Incorrect Authorization CWE-863

Recent mention · The Hacker News

BlackX UEFI Bootkit Bypasses Secure Boot on Patched Windows Systems Missing Revocations

Ravie LakshmananOct 23, 2026Malware / Cyber Espionage Diplomatic organizations in Central Asia have been targeted by a sophisticated new Unified Extensible Firmware Interface (UEFI) bootkit called BlackX. The activity, which singled out diplomatic entities in Tajikistan,...

Read full advisory

Timeline

From disclosure to observed exploitation

  1. 20:22 UTC

    Added to Previdian KEV Feed

    High-confidence, third-party attested exploitation

  2. 20:22 UTC

    CVE published

    Vulnerability disclosed publicly

  3. 00:00 UTC

    CVE ID reserved

    Identifier reserved by the CNA

Pro API

Automate this intelligence

Confidence, exploit status, sensor telemetry, PoCs, scanner integrations, mentions, and tags are available programmatically for VM, SOC, and CTI workflows.

Start 14-day Pro trial Read API docs
  • Evidence confidence and provenance
  • First-party sensor telemetry
  • PoC and scanner references
  • Affected versions and enrichment
  • Automation-ready JSON delivery

GET /api/v2/pro/kevs/CVE-2022-21894

Sample API response 
{
  "cve_id": "CVE-2022-21894",
  "confidence": "High",
  "cvss_score": 4.4,
  "cvss_estimated": false,
  "epss_score": 0.06768,
  "exploit_status": {
    "exploited_in_the_wild": false,
    "active_exploitation_observed": false
  },
  "sensor_telemetry": { "attempts": 0, "sensors": 0 }
}