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Full vulnerability report · 2022
CVE-2022-21971High confidence

Microsoft Windows Runtime Remote Code Execution Vulnerability

Microsoft · Windows

7.8HighCVSS 3.1
Recommended action
Patch now

CISA confirms exploitation in the wild and lists 2022-09-08 as the remediation due date.

Patch available
R
Operational reassessment

Published severity in operational context

Open reassessment dashboard →
Published severityHighOperational priority:Critical, raised one band.upgradedsince 18 Aug 2022

Evidence used

  • CISA confirms exploitation in the wild.
  • EPSS is 53.93% for the current model date.

Compensating controls

  • Validate the affected product branch and deploy the verified fixed release.
  • Restrict local access and enforce least privilege on affected hosts.
  • Increase monitoring for the attack path and post-exploitation behaviour described in the report.

Verification

  1. Confirm that the asset runs Microsoft Windows and falls inside the recorded affected range.
  2. Verify the installed build against the product-specific fixed version after deployment.
  3. Validate exposure, authentication requirements and compensating controls in the actual environment.
  4. Reopen this reassessment when CVSS, KEV, EPSS, exploit evidence or remediation changes.
Mitigation target: Within 3 daysRemediation target: Within 90 days

This automated reassessment organises public evidence. It does not know asset exposure, business impact or control effectiveness and does not replace CVSS or a human risk decision.

Optional official sources

National CERT insights
?CERT means Computer Emergency Response Team; CSIRT is the closely related term Computer Security Incident Response Team.

Choose official national sources for this report. Each advisory shows its original language. Your selection is remembered on this device and included in shared links.

Official European source

ENISA European Vulnerability Database

Official EUVD identifiers, advisory evidence and known-exploited context. Missing fields are not treated as evidence of low risk.

1 current
ENISA EUVD identifier

EUVD-2022-27126

CISA KEV mirrored by ENISA

Windows Runtime Remote Code Execution Vulnerability

EUVD state
Present in the current official mapping
Known exploitation
Recorded by ENISA since 18 Aug 2022. Evidence sources: cisa_kev.
ENISA score
7.8 · CVSS 3.1
Advisory evidence
1 linked advisory record
Recommended actionPatch now

CISA confirms exploitation in the wild and lists 2022-09-08 as the remediation due date.

Patch available
01

What, why and how

Microsoft Windows Runtime contains an unspecified vulnerability that allows for remote code execution.

What

Microsoft Windows Runtime contains an unspecified vulnerability that allows for remote code execution.

Why

The product accesses or uses a pointer that has not been initialized.

How

An attacker operating through local access may attempt exploitation without authentication after a user interaction. If successful, the issue may execute code or commands in the affected security context.

What

Microsoft Windows Runtime contains an unspecified vulnerability that allows for remote code execution.

Why

The product accesses or uses a pointer that has not been initialized.

How

An attacker operating through local access may attempt exploitation without authentication after a user interaction. If successful, the issue may execute code or commands in the affected security context.

02

Exploit reality and attack path

CVSS severity, EPSS forecast probability, public exploit material and CISA-confirmed exploitation are separate signals.

Observed exploitation
?Confirmed exploitation and public exploit material are separate signals. Attacks can occur without public proof-of-concept or exploit code.
Confirmed in the wild

CISA added this CVE to its Known Exploited Vulnerabilities catalogue on 2022-08-18.

Public PoC / exploit material
?Confirmed exploitation and public exploit material are separate signals. Attacks can occur without public proof-of-concept or exploit code.
None recorded

No exploit-tagged reference or CISA SSVC proof-of-concept state is currently recorded. Research may still exist outside the structured feeds.

Likely attack path
local access → Access of Uninitialized Pointer → execute code or commands in the affected security context
Attack surface
Local
Privileges required
None: unauthenticated exploitation is possible
User interaction
Required interaction required
Attack complexity
Low: no specialised conditions are recorded
Security boundary
Unchanged: impact remains within the vulnerable component's security authority
Weakness
?CWE means Common Weakness Enumeration: a standard category for the underlying weakness.
CWE-824 ↗

CWE-824: Access of Uninitialized Pointer. The product accesses or uses a pointer that has not been initialized.

CVSS vector
?CVSS means Common Vulnerability Scoring System. The vector records the metric values used to calculate technical severity.
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C

Common Vulnerability Scoring System 3.1: the compact vector below is decoded into plain language.

AVLocalAttack vector: The attacker needs local access to the vulnerable system.ACLowAttack complexity: No specialised conditions are required beyond attacker-controlled input.PRNonePrivileges required: The attacker does not need an account or existing privileges.UIRequiredUser interaction: Another user must perform an action for exploitation to succeed.SUnchangedScope: The security impact remains within the vulnerable component's authority.CHighConfidentiality impact: A successful attack can cause a major loss.IHighIntegrity impact: A successful attack can cause a major loss.AHighAvailability impact: A successful attack can cause a major loss.
Post-exploitation / living off the land
After compromise, an attacker may use built-in shells, scripting engines, scheduled tasks and native network utilities for discovery, persistence or movement. This is a plausible LoTL path, not evidence that it has occurred for every attack.
UnauthenticatedRemote code executionCWE-824CISA KEV
A

Official authority intelligence

Only matched European and national findings are included. Language selectors and unavailable sources are omitted.

ENISA EUVD · EUVD-2022-27126Known-exploited evidence recorded

Windows Runtime Remote Code Execution Vulnerability

Official EUVD record ↗
Cyber Security Agency of Singapore · English · CSA-SB-20220216Security Bulletin 16 Feb 2022

The Cyber Security Agency of Singapore included this CVE in its official Security Bulletin 16 Feb 2022, published on 16 February 2022. Open the linked bulletin for the product, severity and reference information published in that issue.

Official advisory ↗
CERT-FR · French · CERTFR-2022-AVI-130Multiples vulnérabilités dans Microsoft Windows

r 2022 Windows Server 2022 (Server Core installation) Windows Server 2022 Azure Edition Core Hotpatch Windows Server, version 20H2 (Server Core Installation) Résumé De multiples vulnérabilités ont été corrigées dans Microsoft Windows . Elles permettent à un attaquant de provoquer un déni de service, une élévation de privilèges, une atteinte à la confidentialité des données et une exécution de code à distance. Solution Se référer au bulletin de sécurité de l'éditeur pour l'obtention des correctifs (cf. section Documentation). Documentation Bulletin de sécurité Microsoft du 08 février 2022 https://msrc.microsoft.com/update-guide/ Référence CVE CVE-2022-21971 https://www.cve.org/CVERecord?id=CVE-2022-21971 Référence CVE CVE-2022-21974 https://www.cve.org/CVERecord?id=CVE-2022-21974 Référence CVE CVE-2022-21981 https://www.cve.org/CVERecord?id=CVE-2022-21981 Référence CVE CVE-2022-21984 https://www.cve.org/CVERecord?id=CVE-2022-21984 Référence CVE CVE-2022-21985 https://www.cve.org/CVERecord?id=CVE-2022-21985 Référence CVE CVE-2022-21989 https://www.cve.org/CVERecord?id=CVE-2022-21989 Référence CVE CVE-2022-21992 https://www.cve.org/CVERecord?id=CVE-2022-21992 Référence CVE CVE-2022-21993 https://www.cve.org/CVERecord?id=CVE-2022-21993 Référence CVE CVE-2022-21994 https://www.cve.org/CVERecord?id=

Official advisory ↗
JVN iPedia · Japanese · JVNDB-2022-001370複数の Microsoft Windows 製品におけるリモートでコードを実行される脆弱性

Microsoft Windows 10、Windows 11、Windows Server には、Windows ランタイムに不備があるため、リモートでコードを実行される脆弱性が存在します。

Official advisory ↗
KISA KrCERT/CC · Korean · KNVD-5701현재 악용되고 있는 Exploit(Update. 2022-08-18)

Microsoft Windows Runtime contains an unspecified vulnerability which allows for remote code execution.

Official advisory ↗
KISA KrCERT/CC · Korean · KNVD-5501MS 2월 보안 위협에 따른 정기 보안 업데이트 권고

tudio Code 원격 개발 확장 원격 코드 실행 취약성 Windows Kernel CVE-2022-21989 Windows 커널 권한 상승 취약성 Microsoft Office Visio CVE-2022-21988 Microsoft Office Visio 원격 코드 실행 취약성 Microsoft Office SharePoint CVE-2022-21987 Microsoft SharePoint Server 스푸핑 취약성 Kestrel Web Server CVE-2022-21986 .NET 서비스 거부 취약성 Windows Remote Access Connection Manager CVE-2022-21985 Windows 원격 액세스 연결 관리자 정보 유출 취약성 Role: DNS Server CVE-2022-21984 Windows DNS 서버 원격 코드 실행 취약성 Windows Common Log File System Driver CVE-2022-21981 Windows 공용 로그 파일 시스템 드라이버 권한 상승 취약성 Roaming Security Rights Management Services CVE-2022-21974 로밍 보안 권리 관리 서비스 원격 코드 실행 취약성 Windows Remote Procedure Call Runtime CVE-2022-21971 Windows 작동 시간 원격 코드 실행 취약성 Microsoft Office SharePoint CVE-2022-21968 Microsoft SharePoint Server 보안 기능 우회 취약성 Microsoft Teams CVE-2022-21965 Microsoft Teams 서비스 거부 취약성 Microsoft Dynamics CVE-2022-21957 Microsoft Dynamics 365(온-프레미스) 원격 코드 실행 취약성 Microsoft Windows Codecs Library CVE-2022-21927 HEVC 비디오 확장 원격 코드 실행 취약성 Microsoft Windows Codecs Library CVE-2022-21926 HEVC 비디오 확장 원격 코드 실행 취약성 Windows Diagnostic Hub CVE-2022-21871 Microsoft 진단 허브 표준 수집기 런타임 권한 상승 취약성 Microsoft Windows Codecs Library CVE-2022-21844 HEVC 비디오 확장 원격 코드 실행 취약성 Windows Kernel CVE-2021-34500 Windows 커널 메모리 정보 유출 취약성 Microsoft Windows CVE-2019-0887 원격 데스크톱 서비스 원격 코드 실행

Official advisory ↗
03

Patch and workaround

Operational remediation based on structured source evidence.

Status
?Patch availability is based on structured fixed-version fields and authoritative update references. If no fix is verified, check the vendor advisory before making a change.
Patch available
Affected
Fixed
An authoritative update reference is available, but the fixed version is not recorded in the structured CVE fields. Check the linked vendor advisory for the applicable release.
Action
Review the linked authoritative reference and apply the recorded fixed release appropriate to the affected product branch.
Workaround
No verified workaround is recorded. Limit untrusted access and use least privilege until authoritative guidance is available.
04

Evidence and provenance

Published 9 Feb 2022 · Last source change 21 Oct 2025, 23:15 UTC · CWE-824 · Access of Uninitialized Pointer

CVE recordCVE.org · 5.1
CVSS sourceCNA
EPSS source
?The date BlackTree first stored a score for this CVE from the daily FIRST EPSS feed.
FIRST · tracked since 2026-08-14
European sourceENISA EUVD · EUVD-2022-27126
Product sourceCISA KEV
Remediation sourceCVE/CNA references
CWE sourceCISA ADP
NVD statusNVD enriched

Core structured fields are present and their contributing authorities are shown above.

Material change intelligence

What changed after publication

View recent updates ↗
  1. Affected versionsThe structured affected or fixed version information changed.
    Before
    10.0.17763.0 < 10.0.17763.2565; 10.0.0 < 10.0.17763.2565; 10.0.0 < 10.0.18363.2094; 10.0.0 < 10.0.19043.1526; 10.0.20348.0 < 10.0.20348.524; 10.0.0 < 10.0.19042.1526 · Fixed: An authoritative update reference is available, but the fixed version is not recorded in the structured CVE fields. Check the linked vendor advisory for the applicable release.
    After
    Windows 10 Version 1809: 10.0.17763.0 < 10.0.17763.2565, 10.0.0 < 10.0.17763.2565; Windows Server 2019: 10.0.17763.0 < 10.0.17763.2565; Windows Server 2019 (Server Core installation): 10.0.17763.0 < 10.0.17763.2565; Windows 10 Version 1909: 10.0.0 < 10.0.18363.2094; Windows 10 Version 21H1: 10.0.0 < 10.0.19043.1526; Windows Server 2022: 10.0.20348.0 < 10.0.20348.524; Windows 10 Version 20H2: 10.0.0 < 10.0.19042.1526; Windows Server version 20H2: 10.0.0 < 10.0.19042.1526; Windows 11 version 21H2: 10.0.0 < 10.0.22000.493; Windows 10 Version 21H2: 10.0.19043.0 < 10.0.19044.1526 · Fixed: An authoritative update reference is available, but the fixed version is not recorded in the structured CVE fields. Check the linked vendor advisory for the applicable release.
    CNA ↗
Material fields only · duplicate refreshes suppressed · history retained for the configured operational retention period
CVE published
Added to CISA KEV
Fixed release or patch reference recorded
ENISA EUVD · EUVD-2022-27126↗CISA KEV record↗CVE authority or vendor reference↗Official CVE record (CNA and ADP data)↗NVD record↗
Technical terms and abbreviations used in this report
CVE
Common Vulnerabilities and Exposures: the public identifier for one disclosed vulnerability.
CVSS
Common Vulnerability Scoring System: a technical severity framework; it is not patching priority by itself.
EPSS
Exploit Prediction Scoring System: FIRST's estimate of the probability that exploitation activity will be observed in the next 30 days; it is a forecast, not confirmation.
CWE
Common Weakness Enumeration: the standard category describing the underlying software or hardware weakness.
CNA
CVE Numbering Authority: an organisation authorised to assign and publish CVE records.
CISA ADP
Cybersecurity and Infrastructure Security Agency Authorized Data Publisher: structured enrichment added to a CVE record.
NVD
National Vulnerability Database: NIST's enrichment service for CVE records.
CERT / CSIRT
A computer security incident response team that publishes warnings or coordinates incident response.
PoC
Proof of concept: public material that demonstrates or helps reproduce exploitation.
CSAF
Common Security Advisory Framework: a machine-readable format for security advisories.
LoTL
Living off the land: abuse of legitimate tools or system functions during an attack.
Free version - for non-commercial use only.CVE-2022-21971 · cve.blacktree.nl