Windows 10 1607
CVE-2026-21253
HIGH
Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata – not a confirmed exploit chain
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AccessGain local system access
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ExploitTrigger mailslot file system race condition
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ExecutionCause use-after-free vulnerability
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ImpactEscalate privileges to system level
Vulnerability Assessment
| Weakness |
CWE
OWASP Top 10:2025
A06:2021 - Vulnerable and Outdated Components
ASVS 5.0
V15 - Secure Coding and Architecture Memory lifecycle management
MITRE ATT&CK
2 techniques across 2 tactics: Execution, Privilege Escalation The technique list with ATT&CK links and the kill-chain view is part of the Basic plan and up. |
| Exploitation Conditions | Local user authentication required on target system; requires High complexity race condition timing exploitation; vulnerable Mailslot File System component must be active; Windows-based system with mailslot protocol support. |
| Impact | CVSS 7.0 (HIGH). Attack vector: Local. Complexity: High. Privileges required: Low. User interaction: None. Exploitable via local access. |
| Exploit ScenarioDerived | An attacker could exploit this vulnerability to compromise the affected system. |
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Alert meAnalysisAIv1 – Mar 12, 2026
Use after free in Mailslot File System allows an authorized attacker to elevate privileges locally. [CVSS 7.0 HIGH]
RemediationAI
Monitor vendor advisories for a patch.
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-416 (Use After Free). Affects Windows 10 1607. Use after free in Mailslot File System allows an authorized attacker to elevate privileges locally.
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- Exploit and PoC references, threat intelligence from 22 sources
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Severity by source
AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
Primary rating from NVD · only source for this CVE.
CVSS VectorNVD
DescriptionCVE.org
Use after free in Mailslot File System allows an authorized attacker to elevate privileges locally.
Executive ViewAI
A privilege escalation vulnerability in the Windows Mailslot File System allows authorized users to gain elevated system access. This poses a significant risk to any organization running Windows systems, as compromised user accounts could be leveraged to obtain administrative control, potentially enabling lateral movement, data exfiltration, and system compromise.
Disable Mailslot functionality where not required for business operations; implement strict access controls limiting Mailslot usage to trusted applications only; enforce principle of least privilege to restrict authorized user account permissions; deploy endpoint detection and response (EDR) tools to detect privilege escalation attempts; segment network to limit lateral movement if compromise occurs; maintain audit logging for all Mailslot access and privilege elevation events.
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
Use-after-free vulnerabilities occur when a program continues to access memory through a pointer after that memory has been deallocated.
Memory corruption occurs when a program writes data beyond the boundaries of allocated memory regions or accesses memory in unintended ways, violating the integrity of the process's address space.
Denial of Service attacks render applications or systems unavailable by overwhelming resources or triggering failure conditions.
Affected Products (CPE)CVE.org
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GitHub PoC
Exploit-DB