Windows
CVE-2026-25188
HIGH
Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata – not a confirmed exploit chain
-
AccessCraft malicious packet on adjacent network
-
ExploitSend to Windows Telephony Service
-
ExecutionTrigger heap buffer overflow
-
ImpactAchieve privilege escalation
Vulnerability Assessment
| Weakness |
CWE
OWASP Top 10:2025
A06:2021 - Vulnerable and Outdated Components
ASVS 5.0
V15 - Secure Coding and Architecture Heap buffer bounds checking
MITRE ATT&CK
1 technique across 1 tactic: Execution The technique list with ATT&CK links and the kill-chain view is part of the Basic plan and up. |
| Exploitation Conditions | Attacker must be on the same local network segment (AV:A). Windows Telephony Service must be running with default settings. No authentication required. No user interaction required. |
| Impact | CVSS 8.8 (HIGH). Attack vector: Adjacent Network. Complexity: Low. Privileges required: None. User interaction: None. Exploitation no authentication required. Exploitable via remote/network. |
| Exploit ScenarioDerived | A remote attacker without authentication could exploit this vulnerability to compromise the affected system. |
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Alert meAnalysisAIv1 – Mar 12, 2026
Privilege escalation in Windows Telephony Service through heap buffer overflow affects Windows 10 1607, Windows 11 25h2, and Windows Server 2012, allowing adjacent network attackers to gain elevated system access without authentication. The vulnerability has a high CVSS score of 8.8 but currently lacks a patch, creating significant risk for exposed systems. Exploitation requires network proximity but no user interaction.
Earlier versions of this analysis (1)
Heap-based buffer overflow in Windows Telephony Service allows an unauthorized attacker to elevate privileges over an adjacent network. [CVSS 8.8 HIGH]
RemediationAI
Monitor vendor advisories for a patch. Enable ASLR, DEP/NX, and stack canaries where possible.
Affected Packages
Source: OSV (Open Source Vulnerabilities)
Affects your stack
Affects 15 packages in microsoft
Checking this CVE against your own stacks and servers is part of the Basic plan and up.
Technical ContextAI · show details
Classified as CWE-122 (Heap-based Buffer Overflow). Heap-based buffer overflow in Windows Telephony Service allows an unauthorized attacker to elevate privileges over an adjacent network.
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- Exploit and PoC references, threat intelligence from 22 sources
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Severity by source
AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Primary rating from NVD · only source for this CVE.
CVSS VectorNVD
DescriptionCVE.org
Heap-based buffer overflow in Windows Telephony Service allows an unauthorized attacker to elevate privileges over an adjacent network.
Executive ViewAI
A critical heap-based buffer overflow in Windows Telephony Service (CVE-2026-25188) allows attackers on adjacent networks to gain elevated system privileges without a vendor patch currently available. This vulnerability poses immediate risk to any organization running Windows systems with Telephony Service enabled, potentially compromising sensitive data and system integrity across the enterprise.
Disable Windows Telephony Service (tapi3svc) on systems where not operationally required; implement network segmentation to restrict adjacent network access to vulnerable systems; deploy host-based intrusion detection focused on heap overflow exploitation patterns; restrict inbound RPC connections via firewall rules; monitor Event Viewer for Telephony Service errors and anomalous behavior; apply principle of least privilege to limit privilege escalation impact if exploitation occurs.
Threat Intelligence Overview
NVD
CVE.org
EPSS
VulDB
How this decision was reached
The engine reads each signal below and applies a fixed list of rules from top to bottom. The first rule that matches sets the recommended action – like a statement, every line is shown.
What every action level means
SSVC AssessmentENISA
Priority Score
Attack Technique
A buffer overflow occurs when a program writes more data to a memory buffer than it was allocated to hold, causing the excess data to spill into adjacent memory regions.
A heap overflow occurs when a program writes data beyond the bounds of a buffer allocated in the heap memory region.
Affected Products (CPE)CVE.org
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GitHub PoC
Exploit-DB