Microsoft Windows Server 2016
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By the Year
In 2026 there have been 71 vulnerabilities in Microsoft Windows Server 2016 with an average score of 7.0 out of ten. Last year, in 2025 Windows Server 2016 had 601 security vulnerabilities published. Right now, Windows Server 2016 is on track to have less security vulnerabilities in 2026 than it did last year. Last year, the average CVE base score was greater by 0.21
| Year | Vulnerabilities | Average Score |
|---|---|---|
| 2026 | 71 | 7.01 |
| 2025 | 601 | 7.21 |
| 2024 | 494 | 7.52 |
| 2023 | 505 | 7.53 |
| 2022 | 515 | 7.43 |
| 2021 | 505 | 7.38 |
| 2020 | 801 | 7.34 |
| 2019 | 460 | 7.30 |
| 2018 | 249 | 7.29 |
It may take a day or so for new Windows Server 2016 vulnerabilities to show up in the stats or in the list of recent security vulnerabilities. Additionally vulnerabilities may be tagged under a different product or component name.
Recent Microsoft Windows Server 2016 Security Vulnerabilities
Feb 2026: GDI+ Denial of Service Vulnerability
CVE-2026-20846
7.5 - High
- February 10, 2026
Buffer over-read in Windows GDI+ allows an unauthorized attacker to deny service over a network.
Buffer Over-read
Feb 2026: Windows Kernel Information Disclosure Vulnerability
CVE-2026-21222
5.5 - Medium
- February 10, 2026
Insertion of sensitive information into log file in Windows Kernel allows an authorized attacker to disclose information locally.
Insertion of Sensitive Information into Log File
Feb 2026: Windows Kernel Elevation of Privilege Vulnerability
CVE-2026-21231
7.8 - High
- February 10, 2026
Concurrent execution using shared resource with improper synchronization ('race condition') in Windows Kernel allows an authorized attacker to elevate privileges locally.
Race Condition
Feb 2026: Windows Ancillary Function Driver for WinSock Elevation of Privilege Vulnerability
CVE-2026-21238
7.8 - High
- February 10, 2026
Improper access control in Windows Ancillary Function Driver for WinSock allows an authorized attacker to elevate privileges locally.
Authorization
Feb 2026: Windows Kernel Elevation of Privilege Vulnerability
CVE-2026-21239
7.8 - High
- February 10, 2026
Heap-based buffer overflow in Windows Kernel allows an authorized attacker to elevate privileges locally.
Heap-based Buffer Overflow
Feb 2026: Windows Hyper-V Remote Code Execution Vulnerability
CVE-2026-21244
7.3 - High
- February 10, 2026
Heap-based buffer overflow in Windows Hyper-V allows an authorized attacker to execute code locally.
Heap-based Buffer Overflow
Feb 2026: Windows NTLM Spoofing Vulnerability
CVE-2026-21249
3.3 - Low
- February 10, 2026
External control of file name or path in Windows NTLM allows an unauthorized attacker to perform spoofing locally.
External Control of File Name or Path
Feb 2026: Cluster Client Failover (CCF) Elevation of Privilege Vulnerability
CVE-2026-21251
7.8 - High
- February 10, 2026
Use after free in Windows Cluster Client Failover allows an authorized attacker to elevate privileges locally.
Dangling pointer
Feb 2026: Windows Hyper-V Security Feature Bypass Vulnerability
CVE-2026-21255
8.8 - High
- February 10, 2026
Improper access control in Windows Hyper-V allows an authorized attacker to bypass a security feature locally.
Authorization
Feb 2026: Mailslot File System Elevation of Privilege Vulnerability
CVE-2026-21253
7 - High
- February 10, 2026
Use after free in Mailslot File System allows an authorized attacker to elevate privileges locally.
Dangling pointer
Feb 2026: Windows Storage Elevation of Privilege Vulnerability
CVE-2026-21508
7 - High
- February 10, 2026
Improper authentication in Windows Storage allows an authorized attacker to elevate privileges locally.
authentification
Feb 2026: Windows Remote Access Connection Manager Denial of Service Vulnerability
CVE-2026-21525
6.2 - Medium
- February 10, 2026
Null pointer dereference in Windows Remote Access Connection Manager allows an unauthorized attacker to deny service locally.
NULL Pointer Dereference
Feb 2026: Windows Shell Security Feature Bypass Vulnerability
CVE-2026-21510
8.8 - High
- February 10, 2026
Protection mechanism failure in Windows Shell allows an unauthorized attacker to bypass a security feature over a network.
Protection Mechanism Failure
Feb 2026: MSHTML Framework Security Feature Bypass Vulnerability
CVE-2026-21513
8.8 - High
- February 10, 2026
Protection mechanism failure in MSHTML Framework allows an unauthorized attacker to bypass a security feature over a network.
Protection Mechanism Failure
Feb 2026: Windows Remote Desktop Services Elevation of Privilege Vulnerability
CVE-2026-21533
7.8 - High
- February 10, 2026
Improper privilege management in Windows Remote Desktop allows an authorized attacker to elevate privileges locally.
Improper Privilege Management
Feb 2026: Windows Ancillary Function Driver for WinSock Elevation of Privilege Vulnerability
CVE-2026-21236
7.8 - High
- February 10, 2026
Heap-based buffer overflow in Windows Ancillary Function Driver for WinSock allows an authorized attacker to elevate privileges locally.
Heap-based Buffer Overflow
Feb 2026: Windows Graphics Component Elevation of Privilege Vulnerability
CVE-2026-21235
7.3 - High
- February 10, 2026
Use after free in Microsoft Graphics Component allows an authorized attacker to elevate privileges locally.
Dangling pointer
Feb 2026: Windows Graphics Component Elevation of Privilege Vulnerability
CVE-2026-21246
7.8 - High
- February 10, 2026
Heap-based buffer overflow in Microsoft Graphics Component allows an authorized attacker to elevate privileges locally.
Heap-based Buffer Overflow
Feb 2026: Windows Hyper-V Remote Code Execution Vulnerability
CVE-2026-21248
7.3 - High
- February 10, 2026
Heap-based buffer overflow in Windows Hyper-V allows an authorized attacker to execute code locally.
Heap-based Buffer Overflow
Feb 2026: Windows Hyper-V Remote Code Execution Vulnerability
CVE-2026-21247
7.3 - High
- February 10, 2026
Improper input validation in Windows Hyper-V allows an authorized attacker to execute code locally.
Improper Input Validation
Feb 2026: Desktop Window Manager Elevation of Privilege Vulnerability
CVE-2026-21519
7.8 - High
- February 10, 2026
Access of resource using incompatible type ('type confusion') in Desktop Window Manager allows an authorized attacker to elevate privileges locally.
Object Type Confusion
Jan 2026: Windows File Explorer Information Disclosure Vulnerability
CVE-2026-20939
5.5 - Medium
- January 13, 2026
Exposure of sensitive information to an unauthorized actor in Windows File Explorer allows an authorized attacker to disclose information locally.
Information Disclosure
Jan 2026: Windows File Explorer Information Disclosure Vulnerability
CVE-2026-20937
5.5 - Medium
- January 13, 2026
Exposure of sensitive information to an unauthorized actor in Windows File Explorer allows an authorized attacker to disclose information locally.
Information Disclosure
Jan 2026: Windows NDIS Information Disclosure Vulnerability
CVE-2026-20936
4.3 - Medium
- January 13, 2026
Out-of-bounds read in Windows NDIS allows an authorized attacker to disclose information with a physical attack.
Out-of-bounds Read
Jan 2026: Windows Telephony Service Elevation of Privilege Vulnerability
CVE-2026-20931
8 - High
- January 13, 2026
External control of file name or path in Windows Telephony Service allows an authorized attacker to elevate privileges over an adjacent network.
External Control of File Name or Path
Jan 2026: Windows HTTP.sys Elevation of Privilege Vulnerability
CVE-2026-20929
7.5 - High
- January 13, 2026
Improper access control in Windows HTTP.sys allows an authorized attacker to elevate privileges over a network.
Authorization
Jan 2026: NTLM Hash Disclosure Spoofing Vulnerability
CVE-2026-20872
6.5 - Medium
- January 13, 2026
External control of file name or path in Windows NTLM allows an unauthorized attacker to perform spoofing over a network.
External Control of File Name or Path
Jan 2026: Windows Routing and Remote Access Service (RRAS) Remote Code Execution Vulnerability
CVE-2026-20868
8.8 - High
- January 13, 2026
Heap-based buffer overflow in Windows Routing and Remote Access Service (RRAS) allows an unauthorized attacker to execute code over a network.
Heap-based Buffer Overflow
Jan 2026: Windows Kerberos Elevation of Privilege Vulnerability
CVE-2026-20849
7.5 - High
- January 13, 2026
Reliance on untrusted inputs in a security decision in Windows Kerberos allows an authorized attacker to elevate privileges over a network.
Reliance on Untrusted Inputs in a Security Decision
Jan 2026: Windows Routing and Remote Access Service (RRAS) Elevation of Privilege Vulnerability
CVE-2026-20843
7.8 - High
- January 13, 2026
Improper access control in Windows Routing and Remote Access Service (RRAS) allows an authorized attacker to elevate privileges locally.
Authorization
Jan 2026: Windows SMB Server Elevation of Privilege Vulnerability
CVE-2026-20848
7.5 - High
- January 13, 2026
Concurrent execution using shared resource with improper synchronization ('race condition') in Windows SMB Server allows an authorized attacker to elevate privileges over a network.
Race Condition
Jan 2026: Windows Cloud Files Mini Filter Driver Elevation of Privilege Vulnerability
CVE-2026-20940
7.8 - High
- January 13, 2026
Heap-based buffer overflow in Windows Cloud Files Mini Filter Driver allows an authorized attacker to elevate privileges locally.
Untrusted Pointer Dereference
Jan 2026: Windows SMB Server Elevation of Privilege Vulnerability
CVE-2026-20934
7.5 - High
- January 13, 2026
Concurrent execution using shared resource with improper synchronization ('race condition') in Windows SMB Server allows an authorized attacker to elevate privileges over a network.
Race Condition
Jan 2026: Windows File Explorer Information Disclosure Vulnerability
CVE-2026-20932
5.5 - Medium
- January 13, 2026
Exposure of sensitive information to an unauthorized actor in Windows File Explorer allows an authorized attacker to disclose information locally.
Information Disclosure
Jan 2026: Windows SMB Server Denial of Service Vulnerability
CVE-2026-20927
5.3 - Medium
- January 13, 2026
Concurrent execution using shared resource with improper synchronization ('race condition') in Windows SMB Server allows an authorized attacker to deny service over a network.
Race Condition
Jan 2026: Windows SMB Server Elevation of Privilege Vulnerability
CVE-2026-20926
7.5 - High
- January 13, 2026
Concurrent execution using shared resource with improper synchronization ('race condition') in Windows SMB Server allows an authorized attacker to elevate privileges over a network.
Race Condition
Jan 2026: NTLM Hash Disclosure Spoofing Vulnerability
CVE-2026-20925
6.5 - Medium
- January 13, 2026
External control of file name or path in Windows NTLM allows an unauthorized attacker to perform spoofing over a network.
External Control of File Name or Path
Jan 2026: Windows NTFS Remote Code Execution Vulnerability
CVE-2026-20922
7.8 - High
- January 13, 2026
Heap-based buffer overflow in Windows NTFS allows an authorized attacker to execute code locally.
Heap-based Buffer Overflow
Jan 2026: Windows SMB Server Elevation of Privilege Vulnerability
CVE-2026-20921
7.5 - High
- January 13, 2026
Concurrent execution using shared resource with improper synchronization ('race condition') in Windows SMB Server allows an authorized attacker to elevate privileges over a network.
Race Condition
Jan 2026: Windows SMB Server Elevation of Privilege Vulnerability
CVE-2026-20919
7.5 - High
- January 13, 2026
Concurrent execution using shared resource with improper synchronization ('race condition') in Windows SMB Server allows an authorized attacker to elevate privileges over a network.
Race Condition
Jan 2026: Windows Local Security Authority Subsystem Service (LSASS) Denial of Service Vulnerability
CVE-2026-20875
7.5 - High
- January 13, 2026
Null pointer dereference in Windows Local Security Authority Subsystem Service (LSASS) allows an unauthorized attacker to deny service over a network.
NULL Pointer Dereference
Jan 2026: Windows Local Session Manager (LSM) Elevation of Privilege Vulnerability
CVE-2026-20869
7 - High
- January 13, 2026
Concurrent execution using shared resource with improper synchronization ('race condition') in Windows Local Session Manager (LSM) allows an authorized attacker to elevate privileges locally.
Race Condition
Jan 2026: Windows Ancillary Function Driver for WinSock Elevation of Privilege Vulnerability
CVE-2026-20860
7.8 - High
- January 13, 2026
Access of resource using incompatible type ('type confusion') in Windows Ancillary Function Driver for WinSock allows an authorized attacker to elevate privileges locally.
Object Type Confusion
Jan 2026: Windows Server Update Service (WSUS) Remote Code Execution Vulnerability
CVE-2026-20856
8.1 - High
- January 13, 2026
Improper input validation in Windows Server Update Service allows an unauthorized attacker to execute code over a network.
Improper Input Validation
Jan 2026: Windows Hello Tampering Vulnerability
CVE-2026-20852
7.7 - High
- January 13, 2026
Incorrect privilege assignment in Windows Hello allows an unauthorized attacker to perform tampering locally.
Incorrect Privilege Assignment
Jan 2026: Microsoft Windows File Explorer Spoofing Vulnerability
CVE-2026-20847
6.5 - Medium
- January 13, 2026
Exposure of sensitive information to an unauthorized actor in Windows Shell allows an authorized attacker to perform spoofing over a network.
Information Disclosure
Jan 2026: Windows Clipboard Server Elevation of Privilege Vulnerability
CVE-2026-20844
7.4 - High
- January 13, 2026
Use after free in Windows Clipboard Server allows an unauthorized attacker to elevate privileges locally.
Dangling pointer
Jan 2026: Windows Client-Side Caching (CSC) Service Information Disclosure Vulnerability
CVE-2026-20839
5.5 - Medium
- January 13, 2026
Improper access control in Windows Client-Side Caching (CSC) Service allows an authorized attacker to disclose information locally.
Authorization
Jan 2026: Windows NTFS Remote Code Execution Vulnerability
CVE-2026-20840
7.8 - High
- January 13, 2026
Heap-based buffer overflow in Windows NTFS allows an authorized attacker to execute code locally.
Heap-based Buffer Overflow
Jan 2026: DirectX Graphics Kernel Elevation of Privilege Vulnerability
CVE-2026-20836
7 - High
- January 13, 2026
Concurrent execution using shared resource with improper synchronization ('race condition') in Graphics Kernel allows an authorized attacker to elevate privileges locally.
Race Condition
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