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Full vulnerability report · 2021
CVE-2021-33763High confidence

Windows Remote Access Connection Manager Information Disclosure Vulnerability

Microsoft · Windows 10 Version 1507

5.5MediumCVSS 3.1
Recommended action
Scheduled

Medium technical severity with no CISA KEV confirmation; remediate through the normal risk-based patch cycle unless local exposure raises the priority.

Patch available
Optional official sources

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

Select the national-authority views to include. The exact source language is shown on each matched advisory. Your choice is remembered on this device and encoded in the shareable URL.

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-2021-20440

No EUVD known-exploited evidence

ENISA has published the identifier mapping but no EUVD description has been stored yet.

EUVD state
Present in the current official mapping
Known exploitation
Not present in the current ENISA EUVD known-exploited dataset. This is not proof of no exploitation.
ENISA score
Not supplied in the stored EUVD record
Advisory evidence
No linked advisory details stored yet
Recommended actionScheduled

Medium technical severity with no CISA KEV confirmation; remediate through the normal risk-based patch cycle unless local exposure raises the priority.

Patch available
01

What, why and how

Windows Remote Access Connection Manager Information Disclosure Vulnerability

What

Windows Remote Access Connection Manager Information Disclosure Vulnerability

Why

The current structured CVE record identifies a security weakness, but the root cause requires confirmation in the linked vendor material.

How

An attacker operating through local access may attempt exploitation with low privileges. If successful, the issue may obtain information outside the intended access boundary.

What

Windows Remote Access Connection Manager Information Disclosure Vulnerability

Why

The current structured CVE record identifies a security weakness, but the root cause requires confirmation in the linked vendor material.

How

An attacker operating through local access may attempt exploitation with low privileges. If successful, the issue may obtain information outside the intended access boundary.

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.
No confirmed evidence

No CISA KEV match was present at the last successful refresh. This means no confirmation from that source, not proof of no exploitation.

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 → vulnerable operation → obtain information outside the intended access boundary
Attack surface
Local
Privileges required
Low: a basic authenticated account is required
User interaction
None
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.
CWE not yet assigned
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:L/UI:N/S:U/C:H/I:N/A:N/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.PRLowPrivileges required: The attacker needs basic user-level privileges.UINoneUser interaction: No action by another user is required.SUnchangedScope: The security impact remains within the vulnerable component's authority.CHighConfidentiality impact: A successful attack can cause a major loss.INoneIntegrity impact: No direct loss is represented by this metric.ANoneAvailability impact: No direct loss is represented by this metric.
Post-exploitation / living off the land
The issue can support a local privilege or sandbox boundary transition; normal system utilities may then be available in the gained context.
A

Official authority intelligence

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

Cyber Security Agency of Singapore · English · CSA-SB-20210721Security Bulletin 21 Jul 2021

The Cyber Security Agency of Singapore included this CVE in its official Security Bulletin 21 Jul 2021, published on 21 July 2021. Open the linked bulletin for the product, severity and reference information published in that issue.

Official advisory ↗
CERT-FR · French · CERTFR-2021-AVI-520Multiples vulnérabilités dans Microsoft Windows

d?id=CVE-2021-33752 Référence CVE CVE-2021-33754 https://www.cve.org/CVERecord?id=CVE-2021-33754 Référence CVE CVE-2021-33755 https://www.cve.org/CVERecord?id=CVE-2021-33755 Référence CVE CVE-2021-33756 https://www.cve.org/CVERecord?id=CVE-2021-33756 Référence CVE CVE-2021-33757 https://www.cve.org/CVERecord?id=CVE-2021-33757 Référence CVE CVE-2021-33758 https://www.cve.org/CVERecord?id=CVE-2021-33758 Référence CVE CVE-2021-33759 https://www.cve.org/CVERecord?id=CVE-2021-33759 Référence CVE CVE-2021-33760 https://www.cve.org/CVERecord?id=CVE-2021-33760 Référence CVE CVE-2021-33761 https://www.cve.org/CVERecord?id=CVE-2021-33761 Référence CVE CVE-2021-33763 https://www.cve.org/CVERecord?id=CVE-2021-33763 Référence CVE CVE-2021-33764 https://www.cve.org/CVERecord?id=CVE-2021-33764 Référence CVE CVE-2021-33765 https://www.cve.org/CVERecord?id=CVE-2021-33765 Référence CVE CVE-2021-33771 https://www.cve.org/CVERecord?id=CVE-2021-33771 Référence CVE CVE-2021-33772 https://www.cve.org/CVERecord?id=CVE-2021-33772 Référence CVE CVE-2021-33773 https://www.cve.org/CVERecord?id=CVE-2021-33773 Référence CVE CVE-2021-33774 https://www.cve.org/CVERecord?id=CVE-2021-33774 Référence CVE CVE-2021-33779 https://www.cve.org/CVERecord?id=CVE-2021-33779 Référence CVE CVE-2021-33780 https://www.cve.org/CVERecord?id=

Official advisory ↗
JVN iPedia · Japanese · JVNDB-2021-002222複数の Microsoft Windows 製品における情報を公開される脆弱性

複数の Microsoft Windows 製品には、Windows Remote Access Connection Manager に不備があるため、情報を公開される脆弱性が存在します。 本脆弱性は、CVE-2021-33763 および CVE-2021-34457 とは異なる脆弱性です。

Official advisory ↗
JVN iPedia · Japanese · JVNDB-2021-002205複数の Microsoft Windows 製品における情報を公開される脆弱性

複数の Microsoft Windows 製品には、Windows Remote Access Connection Manager に不備があるため、情報を公開される脆弱性が存在します。 本脆弱性は、CVE-2021-33763 および CVE-2021-34454 とは異なる脆弱性です。

Official advisory ↗
JVN iPedia · Japanese · JVNDB-2021-002098複数の Microsoft Windows 製品における情報を公開される脆弱性

複数の Microsoft Windows 製品には、Windows Remote Access Connection Manager に不備があるため、情報を公開される脆弱性が存在します。 本脆弱性は、CVE-2021-34454 および CVE-2021-34457 とは異なる脆弱性です。

Official advisory ↗
KISA KrCERT/CC · Korean · KNVD-5338MS 7월 보안 위협에 따른 정기 보안 업데이트 권고

E-2021-34447 Windows MSHTML 플랫폼 원격 코드 실행 취약성 Windows Partition Management Driver CVE-2021-34493 Windows 파티션 관리 드라이버 권한 상승 취약성 Windows PFX Encryption CVE-2021-34492 Windows 인증서 스푸핑 취약성 Windows Projected File System CVE-2021-33743 Windows 예상 파일 시스템 권한 상승 취약성 Windows Remote Access Connection Manager CVE-2021-34457 Windows 원격 액세스 연결 관리자 정보 유출 취약성 Windows Remote Access Connection Manager CVE-2021-34456 Windows 원격 액세스 연결 관리자 권한 상승 취약성 Windows Remote Access Connection Manager CVE-2021-34445 Windows 원격 액세스 연결 관리자 권한 상승 취약성 Windows Remote Access Connection Manager CVE-2021-33773 Windows 원격 액세스 연결 관리자 권한 상승 취약성 Windows Remote Access Connection Manager CVE-2021-33763 Windows 원격 액세스 연결 관리자 정보 유출 취약성 Windows Remote Access Connection Manager CVE-2021-33761 Windows 원격 액세스 연결 관리자 권한 상승 취약성 Windows Remote Assistance CVE-2021-34507 Windows 원격 지원 정보 유출 취약성 Windows Secure Kernel Mode CVE-2021-33744 Windows 보안 커널 모드 보안 기능 우회 취약성 Windows Security Account Manager CVE-2021-33757 Windows 보안 계정 관리자 원격 프로토콜 보안 기능 우회 취약성 Windows Shell CVE-2021-34454 Windows 원격 액세스 연결 관리자 정보 유출 취약성 Windows SMB CVE-2021-33783 Windows SMB 정보 유출 취약성 Windows Storage Spaces Controller CVE-2021-34513 저장소 공간 컨트롤러 권한 상승 취약성 Windows Storage Spaces Controller CVE-2021-34512 저장소 공간 컨트롤러 권한 상승 취약성 Windows Storage Spaces Controller CVE-2021-34510 저장소

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 14 Jul 2021 · Last source change 10 Aug 2026, 15:11 UTC · CWE not yet assigned

CVE recordCVE.org · 5.2
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-2021-20440
Product sourceCNA
Remediation sourceCVE/CNA references
CWE sourceUnavailable
NVD statusNVD modified after enrichment

Missing structured fields: CWE classification. Missing data is not evidence of low risk; review the primary advisory.

Material change intelligence

What changed after publication

View recent updates ↗

No material field changes have been recorded since change tracking began. Routine source refreshes and cosmetic edits are intentionally excluded.

Material fields only · duplicate refreshes suppressed · history retained for the configured operational retention period
CVE published
Fixed release or patch reference recorded
ENISA EUVD · EUVD-2021-20440↗Patch or update reference↗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-2021-33763 · cve.blacktree.nl