CVE-2026-20854
Unknown
Unknown - Not Provided
Use-After-Free in Windows LSASS Enables Remote Code Execution
Publication date: 2026-01-13
Last updated on: 2026-01-13
Assigner: Microsoft Corporation
Description
Description
Use after free in Windows Local Security Authority Subsystem Service (LSASS) allows an authorized attacker to execute code over a network.
CVSS Scores
EPSS Scores
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Meta Information
Affected Vendors & Products
| Vendor | Product | Version / Range |
|---|---|---|
| microsoft | windows_local_security_authority_subsystem_service | * |
Helpful Resources
Exploitability
CWE
KEV
| CWE ID | Description |
|---|---|
| CWE-416 | 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 Any operations using the original pointer are no longer valid because the memory "belongs" to the code that operates on the new pointer. |
Attack-Flow Graph
AI Powered Q&A
Can you explain this vulnerability to me?
This vulnerability is a use-after-free issue in the Windows Local Security Authority Subsystem Service (LSASS) that allows an authorized attacker to execute code remotely over a network.
How can this vulnerability impact me? :
An attacker who exploits this vulnerability can execute arbitrary code on the affected system remotely, potentially leading to full compromise of confidentiality, integrity, and availability of the system.
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