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Full vulnerability report · 2015
CVE-2015-6126High confidence

Affected product: Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')

Unknown · Unknown

7.2HighCVSS 2.0
Recommended action
Within 7 days

High technical severity; prioritise exposed affected systems while verifying vendor guidance.

Patch available
R
Operational reassessment

Published severity in operational context

Open reassessment dashboard →
Published severityHighOperational priority:High, unchanged from published severity.unchanged

Evidence used

  • No CISA KEV confirmation is currently recorded.
  • EPSS is 1.56% 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.
  • Monitor vendor guidance and exploitation sources for a material change.

Verification

  1. Confirm that the asset runs Unknown Unknown 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 30 daysRemediation target: Within 180 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-2015-6069

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 actionWithin 7 days

High technical severity; prioritise exposed affected systems while verifying vendor guidance.

Patch available
01

What, why and how

Race condition in the Pragmatic General Multicast (PGM) protocol implementation in Microsoft Windows Vista SP2, Windows Server 2008 SP2 and R2 SP1, Windows 7 SP1, Windows 8, Windows 8.1, Windows Server 2012 Gold and R2, Windows RT Gold and 8.1, and Windows 10 Gold and 1511 allows local users to gain privileges or cause a denial of service (use-after-free) via a crafted application, aka "Windows PGM UAF Elevation of Privilege Vulnerability."

What

Race condition in the Pragmatic General Multicast (PGM) protocol implementation in Microsoft Windows Vista SP2, Windows Server 2008 SP2 and R2 SP1, Windows 7 SP1, Windows 8, Windows 8.1, Windows Server 2012 Gold and R2, Windows RT Gold and 8.1, and Windows 10 Gold and 1511 allows local users to gain privileges or cause a denial of service (use-after-free) via a crafted application, aka "Windows PGM UAF Elevation of Privilege Vulnerability."

Why

The product contains a concurrent code sequence that requires temporary, exclusive access to a shared resource, but a timing window exists in which the shared resource can be modified by another code sequence operating concurrently.

How

An attacker operating through the affected interface may attempt exploitation when the stated preconditions are met. If successful, the issue may gain additional privileges.

What

Race condition in the Pragmatic General Multicast (PGM) protocol implementation in Microsoft Windows Vista SP2, Windows Server 2008 SP2 and R2 SP1, Windows 7 SP1, Windows 8, Windows 8.1, Windows Server 2012 Gold and R2, Windows RT Gold and 8.1, and Windows 10 Gold and 1511 allows local users to gain privileges or cause a denial of service (use-after-free) via a crafted application, aka "Windows PGM UAF Elevation of Privilege Vulnerability."

Why

The product contains a concurrent code sequence that requires temporary, exclusive access to a shared resource, but a timing window exists in which the shared resource can be modified by another code sequence operating concurrently.

How

An attacker operating through the affected interface may attempt exploitation when the stated preconditions are met. If successful, the issue may gain additional privileges.

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
the affected interface → Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition') → gain additional privileges
Attack surface
Unspecified
Privileges required
None: unauthenticated exploitation is possible
User interaction
Not stated in the selected CVSS metric
Attack complexity
Low: no specialised conditions are recorded
Security boundary
Not stated in the selected CVSS metric
Weakness
?CWE means Common Weakness Enumeration: a standard category for the underlying weakness.
CWE-362 ↗

CWE-362: Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition'). The product contains a concurrent code sequence that requires temporary, exclusive access to a shared resource, but a timing window exists in which the shared resource can be modified by another code sequence operating concurrently.

CVSS vector
?CVSS means Common Vulnerability Scoring System. The vector records the metric values used to calculate technical severity.
AV:L/AC:L/Au:N/C:C/I:C/A:C
Post-exploitation / living off the land
No specific living-off-the-land technique is confirmed in the structured sources. Monitor normal administration tools for activity inconsistent with the affected service's baseline.
UnauthenticatedPrivilege escalationDenial of serviceCWE-362
A

Official authority intelligence

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

CERT-FR · French · CERTFR-2015-AVI-528Vulnérabilité dans Microsoft Windows PGM

Une vulnérabilité a été corrigée dans Microsoft Windows PGM . Elle permet à un attaquant de provoquer une élévation de privilèges.

Official advisory ↗
JVN iPedia · Japanese · JVNDB-2015-006154複数の Microsoft Windows 製品の Pragmatic General Multicast プロトコルの実装における権限昇格の脆弱性

複数の Microsoft Windows 製品の Pragmatic General Multicast (PGM) プロトコルの実装には、競合状態により、権限を取得される、またはサービス運用妨害 (解放済みメモリの使用) 状態にされる脆弱性が存在します。 マイクロソフトセキュリティ情報には、この脆弱性は「Windows PGM UAF の特権の昇格の脆弱性」と記載されています。 補足情報 : CWE による脆弱性タイプは、CWE-416: Use-after-free (解放済みメモリの使用) と識別されています。 http://cwe.mitre.org/data/definitions/416.html

Official advisory ↗
KISA KrCERT/CC · Korean · KNVD-4572MS 12월 보안 위협에 따른 정기 보안 업데이트 권고

[MS15-132] 원격 코드 실행을 해결하기 위한 Microsoft Windows에 대한 보안 업데이트 ##### □ 영향 공격자가 영향 받는 시스템에 원격 코드 실행 ##### □ 설명 공격자가 로컬 시스템에 액세스하고 특수 제작된 응용 프로그램을 실행하는 경우 원격 코드 실행을 허용하는 취약점이 존재 관련취약점 : - Windows 라이브러리 로드 원격 코드 실행 취약점 - (CVE-2015-6128, 6132~6133) 영향 : 원격 코드 실행 중요도 : 중요 ##### □ 해당시스템 참조사이트 참고 - 한글 : https://technet.microsoft.com/ko-kr/library/security/MS15-132 - 영문 : https://technet.microsoft.com/en-us/library/security/MS15-132 ##### □ 해결책 해당 시스템에 대한 마이크로소프트사의 취약점 패치 적용 [MS15-133] 권한 상승을 해결하기 위한 Windows PGM에 대한 보안 업데이트 ##### □ 영향 공격자가 영향 받는 시스템의 권한 상승 ##### □ 설명 공격자가 특수 제작된 응용 프로그램을 실행하는 경우 권한 상승이 허용되는 취약점 존재 관련취약점 : - Windows PGM UAF 권한 상승 취약점 - (CVE-2015-6126) 영향 : 권한 상승 중요도 : 중요? ##### □ 해당시스템 참조사이트 참고 - 한글 : https://technet.microsoft.com/ko-kr/library/security/MS15-133 - 영문 : https://technet.microsoft.com/en-us/library/security/MS15-133 ##### □ 해결책 해당 시스템에 대한 마이크로소프트사의 취약점 패치 적용 [MS15-134] 원격 코드 실행을 해결하기 위한 Windows Media Center에 대한 보안 업데이트 ##### □ 영향 공격자가 영향 받는 시스템에 원격 코드 실행 ##### □ 설명 특수 제작된 Media Center 링크(.mcl) 파일을 여는 경우 원격 코드 실행을 허 용하는 취약점 관련취약점 : - Windows Media Center 정보 유출 취약점 - (CVE-2015-6127) - Media Center 라이브러리 구문 분석 RCE 취약점 - (CVE-2015-6131) 영향 : 원격 코드 실행 중요도 : 중요 ##### □ 해당시스템 참조사이트 참고 - 한글 : https://technet.microsoft.com/ko-kr/library/security/MS15-134 - 영문 : https://technet.micro

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
n/a
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 Dec 2015 · Last source change 6 Aug 2024, 07:15 UTC · CWE-362 · Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')

CVE recordCVE.org · 5.1
CVSS sourceNIST NVD
EPSS source
?The date BlackTree first stored a score for this CVE from the daily FIRST EPSS feed.
FIRST · tracked since 2026-09-01
European sourceENISA EUVD · EUVD-2015-6069
Product sourceUnavailable
Remediation sourceCVE/CNA references
CWE sourceNIST NVD
NVD statusNVD modified after enrichment

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

Material change intelligence

What changed after publication

View recent updates ↗
  1. ENISA EUVD mappingEUVD-2015-6069 was added to the official ENISA EUVD mapping for this CVE.
    Before
    not recorded
    After
    {"euvdId":"EUVD-2015-6069"}
    ENISA EUVD ↗
  2. SeveritySeverity changed from Unknown to High.
    Before
    Unknown
    After
    High
    NIST NVD ↗
  3. CVSS scoreCVSS score changed from not recorded to 7.2 (CVSS 2.0 · NIST NVD · AV:L/AC:L/Au:N/C:C/I:C/A:C).
    Before
    not recorded
    After
    7.2 (CVSS 2.0 · NIST NVD · AV:L/AC:L/Au:N/C:C/I:C/A:C)
    NIST NVD ↗
  4. Catalogue recordCVE added to the BlackTree catalogue.
    CNA ↗
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-2015-6069↗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-2015-6126 · cve.blacktree.nl