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Full vulnerability report · 2024
CVE-2024-26230High confidence

Windows Telephony Server Elevation of Privilege Vulnerability

Microsoft · Windows 10 Version 1809

7.8HighCVSS 3.1
Recommended action
Within 7 days

High technical severity with public exploit material referenced by a structured source; prioritise exposed affected systems while verifying vendor guidance.

Fix not verified
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.
  • A structured source references public exploit or proof-of-concept material.
  • Exploitation requires an existing local or physical foothold with privileges.
  • EPSS is 24.11% for the current model date.

Compensating controls

  • 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 10 Version 1809 and falls inside the recorded affected range.
  2. Recheck the vendor advisory before scheduling a change because no verified fixed version is currently retained.
  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-2024-23506

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 with public exploit material referenced by a structured source; prioritise exposed affected systems while verifying vendor guidance.

Fix not verified
01

What, why and how

Windows Telephony Server Elevation of Privilege Vulnerability

What

Windows Telephony Server Elevation of Privilege Vulnerability

Why

The program can continue using memory after it has been released, producing unsafe and attacker-influenceable behaviour.

How

An attacker operating through local access may attempt exploitation with low privileges. If successful, the issue may gain additional privileges.

What

Windows Telephony Server Elevation of Privilege Vulnerability

Why

The program can continue using memory after it has been released, producing unsafe and attacker-influenceable behaviour.

How

An attacker operating through local access may attempt exploitation with low privileges. 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.
Reference recorded

CISA Vulnrichment records proof-of-concept exploitation in its SSVC data. BlackTree has not independently executed or validated exploit material.

Likely attack path
local access → Use After Free → gain additional privileges
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: a standard category for the underlying weakness.
CWE-416 ↗

CWE-416: Use After Free. The product reuses or references memory after it has been freed. At some point afterward, the memory may be allocated again and saved in another pointer, while the original pointer references a location somewhere within the new allocation. Any operations using the original pointer are no longer valid because the memory belongs to the code that operates on the new pointer.

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: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.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.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
The issue can support a local privilege or sandbox boundary transition; normal system utilities may then be available in the gained context.
Privilege escalationCWE-416Public exploit reference
A

Official authority intelligence

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

BSI · German · WID-SEC-2024-0841Microsoft Windows: Mehrere Schwachstellen

Ein entfernter, anonymer Angreifer kann mehrere Schwachstellen in Microsoft Windows 10, Microsoft Windows 11, Microsoft Windows Server, Microsoft Windows Server 2012, Microsoft Windows Server 2012 R2, Microsoft Windows Server 2016, Microsoft Windows Server 2019 und Microsoft Windows Server 2022 ausnutzen, um seine Privilegien zu erweitern, beliebigen Programmcode auszuführen, beliebigen Programmcode mit Administratorrechten auszuführen, Informationen offenzulegen, Sicherheitsvorkehrungen zu umgehen, einen Denial of Service Zustand herbeizuführen oder Dateien zu manipulieren

Official advisory ↗
Cyber Security Agency of Singapore · English · CSA-SB-20240410Security Bulletin 10 Apr 2024

The Cyber Security Agency of Singapore included this CVE in its official Security Bulletin 10 Apr 2024, published on 10 April 2024. Open the linked bulletin for the product, severity and reference information published in that issue.

Official advisory ↗
CERT-FR · French · CERTFR-2024-AVI-0289Multiples vulnérabilités dans Microsoft Windows

6224 du 09 avril 2024 https://msrc.microsoft.com/update-guide/vulnerability/CVE-2024-26224 Bulletin de sécurité Microsoft CVE-2024-26226 du 09 avril 2024 https://msrc.microsoft.com/update-guide/vulnerability/CVE-2024-26226 Bulletin de sécurité Microsoft CVE-2024-26227 du 09 avril 2024 https://msrc.microsoft.com/update-guide/vulnerability/CVE-2024-26227 Bulletin de sécurité Microsoft CVE-2024-26228 du 09 avril 2024 https://msrc.microsoft.com/update-guide/vulnerability/CVE-2024-26228 Bulletin de sécurité Microsoft CVE-2024-26229 du 09 avril 2024 https://msrc.microsoft.com/update-guide/vulnerability/CVE-2024-26229 Bulletin de sécurité Microsoft CVE-2024-26230 du 09 avril 2024 https://msrc.microsoft.com/update-guide/vulnerability/CVE-2024-26230 Bulletin de sécurité Microsoft CVE-2024-26231 du 09 avril 2024 https://msrc.microsoft.com/update-guide/vulnerability/CVE-2024-26231 Bulletin de sécurité Microsoft CVE-2024-26232 du 09 avril 2024 https://msrc.microsoft.com/update-guide/vulnerability/CVE-2024-26232 Bulletin de sécurité Microsoft CVE-2024-26233 du 09 avril 2024 https://msrc.microsoft.com/update-guide/vulnerability/CVE-2024-26233 Bulletin de sécurité Microsoft CVE-2024-26234 du 09 avril 2024 https://msrc.microsoft.com/update-guide/vulnerability/CVE-2024-26234 Bulletin de sécurité Microsoft CVE-

Official advisory ↗
JVN iPedia · Japanese · JVNDB-2024-016508マイクロソフトの複数の Microsoft Windows 製品における権限を昇格される脆弱性

マイクロソフトの Microsoft Windows 10、Windows 11、Windows Server には、Windows Telephony Server に不備があるため、権限を昇格される脆弱性が存在します。

Official advisory ↗
KISA KrCERT/CC · Korean · KNVD-6161MS 4월 보안 위협에 따른 정기 보안 업데이트 권고

Remote Access Connection Manager | CVE-2024-26239 | Windows 전화 통신 서버 권한 상승 취약성 | | Windows Defender Credential Guard | CVE-2024-26237 | Windows Defender 원격 Credential Guard 권한 상승 취약성 | | Windows Update Stack | CVE-2024-26236 | Windows 업데이트 스택 권한 상승 취약성 | | Windows Update Stack | CVE-2024-26235 | Windows 업데이트 스택 권한 상승 취약성 | | Windows Proxy Driver | CVE-2024-26234 | 프록시 드라이버 스푸핑 취약성 | | Role: DNS Server | CVE-2024-26233 | Windows DNS 서버 원격 코드 실행 취약성 | | Windows Message Queuing | CVE-2024-26232 | MSMQ(Microsoft 메시지 큐) 원격 코드 실행 취약성 | | Role: DNS Server | CVE-2024-26231 | Windows DNS 서버 원격 코드 실행 취약성 | | Windows Remote Access Connection Manager | CVE-2024-26230 | Windows 전화 통신 서버 권한 상승 취약성 | | Windows Kernel | CVE-2024-26229 | Windows CSC 서비스 권한 상승 취약성 | | Windows Cryptographic Services | CVE-2024-26228 | Windows Cryptographic Services 보안 기능 바이패스 취약성 | | Role: DNS Server | CVE-2024-26227 | Windows DNS 서버 원격 코드 실행 취약성 | | Windows Distributed File System (DFS) | CVE-2024-26226 | Windows DFS(분산 파일 시스템) 정보 유출 취약성 | | Role: DNS Server | CVE-2024-26224 | Windows DNS 서버 원격 코드 실행 취약성 | | Role: DNS Server | CVE-2024-26223 | Windows DNS 서버 원격 코드 실행 취약성 | | Role: DNS Server | CVE-2024-26222 | Windows DNS 서버 원격 코드 실행 취약성 | | Role: DNS Server | CVE-2024-26221 | Windows DNS 서버 원격 코드 실행 취약성 | | Windows Mobile Hot

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.
Fix not verified
Affected
  • Windows 10 Version 1809: 10.0.17763.0 < 10.0.17763.5696, 10.0.0 < 10.0.17763.5696
  • Windows Server 2019: 10.0.17763.0 < 10.0.17763.5696
  • Windows Server 2019 (Server Core installation): 10.0.17763.0 < 10.0.17763.5696
  • Windows Server 2022: 10.0.20348.0 < 10.0.20348.2402
  • Windows 11 version 21H2: 10.0.0 < 10.0.22000.2899
  • Windows 10 Version 21H2: 10.0.19043.0 < 10.0.19044.4291
  • Windows 11 version 22H2: 10.0.22621.0 < 10.0.22621.3447
  • Windows 10 Version 22H2: 10.0.19045.0 < 10.0.19045.4291
  • Windows 11 version 22H3: 10.0.22631.0 < 10.0.22631.3447
  • Windows 11 Version 23H2: 10.0.22631.0 < 10.0.22631.3447
  • Windows Server 2022, 23H2 Edition (Server Core installation): 10.0.25398.0 < 10.0.25398.830
  • Windows 10 Version 1507: 10.0.10240.0 < 10.0.10240.20596
  • Windows 10 Version 1607: 10.0.14393.0 < 10.0.14393.6897
  • Windows Server 2016: 10.0.14393.0 < 10.0.14393.6897
  • Windows Server 2016 (Server Core installation): 10.0.14393.0 < 10.0.14393.6897
  • Windows Server 2008 Service Pack 2: 6.0.6003.0 < 6.0.6003.22618
  • Windows Server 2008 Service Pack 2 (Server Core installation): 6.0.6003.0 < 6.0.6003.22618
  • Windows Server 2008 Service Pack 2: 6.0.6003.0 < 6.0.6003.22618
  • Windows Server 2008 R2 Service Pack 1: 6.1.7601.0 < 6.1.7601.27067
  • Windows Server 2008 R2 Service Pack 1 (Server Core installation): 6.1.7601.0 < 6.1.7601.27067
  • Windows Server 2012: 6.2.9200.0 < 6.2.9200.24821
  • Windows Server 2012 (Server Core installation): 6.2.9200.0 < 6.2.9200.24821
  • Windows Server 2012 R2: 6.3.9600.0 < 6.3.9600.21924
  • Windows Server 2012 R2 (Server Core installation): 6.3.9600.0 < 6.3.9600.21924
Fixed
No fixed version is explicitly recorded in the structured CVE data.
Action
No verified patch reference is present in the current structured sources. Check the vendor advisory before making a change.
Workaround
No verified workaround is recorded. Limit untrusted access and use least privilege until authoritative guidance is available.
04

Evidence and provenance

Published 9 Apr 2024 · Last source change 3 May 2025, 00:40 UTC · CWE-416 · Use After Free

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-2024-23506
Product sourceCNA
Remediation sourceCVE/CNA references
CWE sourceOther authority
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 ↗

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
ENISA EUVD · EUVD-2024-23506↗CISA Vulnrichment SSVC evidence↗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-2024-26230 · cve.blacktree.nl