Microsoft has 4,599 CVEs on record between 2012 and 2026. Disclosure cadence is accelerating: 2930 in the last 90 days against 934 in the 90 before. The busiest recent month was October 2026 with 1482. The median CVSS is 7.8 (high), with 273 rated critical. 2% have been exploited in the wild, in line with the corpus average. The median gap from publication to a KEV listing is 112 days (95 cases). The dominant weakness classes are CWE-122 (931) and CWE-416 (851). Most affected products: windows_10_1607 (988), Windows 10 Version 1607 (877), 365_apps (267).
CVEs per month
Last 12 months, by publish date
- Exploited share
- 2% vs 1% corpus
- Median CVSS
- 7.8
- Publish → KEV
- 112 d median(95)
- Last 90 days
- 2930 prev 934
Weakness classes
Products
- windows_10_1607 988
- Windows 10 Version 1607 877
- 365_apps 267
- Microsoft 365 Apps for Enterprise 232
- Windows 10 Version 1809 199
- windows_10_1809 174
Worst active — by depth score
CVE-2025-53770Critical· 9.8Deserialization of untrusted data in on-premises Microsoft SharePoint Server allows an unauthorized attacker to execute code over a network. Microsoft is aware that an exploit for CVE-2025-53770 exists in the wild. Microsoft is preparing…100CVE-2021-38647Critical· 9.8Open Management Infrastructure (OMI) Remote Code Execution Vulnerability100CVE-2021-34473Critical· 9.1Microsoft Exchange Server Remote Code Execution Vulnerability100CVE-2021-26855Critical· 9.1Microsoft Exchange Server Remote Code Execution Vulnerability100CVE-2020-0796Critical· 10.0A remote code execution vulnerability exists in the way that the Microsoft Server Message Block 3.1.1 (SMBv3) protocol handles certain requests, aka 'Windows SMBv3 Client/Server Remote Code Execution Vulnerability'.100
Microsoft vulnerabilities
CVEs affecting Microsoft, newest first. Open any entry for full detail, references, and exploit status.
4599 CVEsRSS
CVE-2026-83679High· 7.8Use after free in Windows Defender Firewall Service allows an authorized attacker to elevate privileges locally.
Use after free in Windows Defender Firewall Service allows an authorized attacker to elevate privileges locally.
CVE-2026-83678High· 7.8Heap-based buffer overflow in Windows TCP/IP allows an authorized attacker to elevate privileges locally.
Heap-based buffer overflow in Windows TCP/IP allows an authorized attacker to elevate privileges locally.
CVE-2026-83677High· 7.5Missing release of memory after effective lifetime in Windows DHCP Client allows an unauthorized attacker to deny service over a network.
Missing release of memory after effective lifetime in Windows DHCP Client allows an unauthorized attacker to deny service over a network.
CVE-2026-83676High· 7.0Integer underflow (wrap or wraparound) in Windows Installer allows an authorized attacker to elevate privileges locally.
Integer underflow (wrap or wraparound) in Windows Installer allows an authorized attacker to elevate privileges locally.
CVE-2026-83675High· 7.0Use after free in Windows Kernel allows an authorized attacker to elevate privileges locally.
Use after free in Windows Kernel allows an authorized attacker to elevate privileges locally.
CVE-2026-83674High· 8.1Weak authentication in Active Directory Federation Services (AD FS) allows an unauthorized attacker to perform spoofing over a network.
Weak authentication in Active Directory Federation Services (AD FS) allows an unauthorized attacker to perform spoofing over a network.
CVE-2026-83672Medium· 4.7Exposure of sensitive system information to an unauthorized control sphere in Windows Installer allows an authorized attacker to disclose information locally.
Exposure of sensitive system information to an unauthorized control sphere in Windows Installer allows an authorized attacker to disclose information locally.
CVE-2026-83671Medium· 6.5Out-of-bounds read in Windows Hyper-V allows an authorized attacker to disclose information locally.
Out-of-bounds read in Windows Hyper-V allows an authorized attacker to disclose information locally.
CVE-2026-83670High· 7.5Out-of-bounds read in Function Discovery Service (fdwsd.dll) allows an unauthorized attacker to disclose information over a network.
Out-of-bounds read in Function Discovery Service (fdwsd.dll) allows an unauthorized attacker to disclose information over a network.
CVE-2026-83669High· 7.8Use of uninitialized resource in Windows Error Reporting allows an authorized attacker to elevate privileges locally.
Use of uninitialized resource in Windows Error Reporting allows an authorized attacker to elevate privileges locally.
CVE-2026-83668Medium· 5.5Out-of-bounds read in Windows WLAN Service allows an authorized attacker to disclose information locally.
Out-of-bounds read in Windows WLAN Service allows an authorized attacker to disclose information locally.
CVE-2026-83667Medium· 6.5Out-of-bounds read in Active Directory Domain Services allows an authorized attacker to deny service over a network.
Out-of-bounds read in Active Directory Domain Services allows an authorized attacker to deny service over a network.
CVE-2026-83666High· 7.0Concurrent execution using shared resource with improper synchronization ('race condition') in Active Directory Certificate Services (AD CS) allows an authorized attacker to elevate privileges locally.
Concurrent execution using shared resource with improper synchronization ('race condition') in Active Directory Certificate Services (AD CS) allows an authorized attacker to elevate privileges locally.
CVE-2026-83665High· 7.5Null pointer dereference in Windows DHCP Server allows an unauthorized attacker to deny service over a network.
Null pointer dereference in Windows DHCP Server allows an unauthorized attacker to deny service over a network.
CVE-2026-83664Medium· 5.5Access of resource using incompatible type ('type confusion') in Windows Portable Device File System Driver allows an authorized attacker to disclose information locally.
Access of resource using incompatible type ('type confusion') in Windows Portable Device File System Driver allows an authorized attacker to disclose information locally.
CVE-2026-83659High· 7.8Improper link resolution before file access ('link following') in Windows User Profile Service allows an authorized attacker to elevate privileges locally.
Improper link resolution before file access ('link following') in Windows User Profile Service allows an authorized attacker to elevate privileges locally.
CVE-2026-83658Medium· 5.5Improper access control in Windows Error Reporting allows an authorized attacker to disclose information locally.
Improper access control in Windows Error Reporting allows an authorized attacker to disclose information locally.
CVE-2026-83657Medium· 5.5Weak authentication in Windows Modern Device Management (MDM) allows an authorized attacker to perform tampering locally.
Weak authentication in Windows Modern Device Management (MDM) allows an authorized attacker to perform tampering locally.
CVE-2026-83656Medium· 4.7Missing authentication for critical function in Windows Modern Device Management (MDM) allows an authorized attacker to perform tampering locally.
Missing authentication for critical function in Windows Modern Device Management (MDM) allows an authorized attacker to perform tampering locally.
CVE-2026-83655High· 7.5Out-of-bounds read in Network Policy Server (NPS) allows an unauthorized attacker to deny service over a network.
Out-of-bounds read in Network Policy Server (NPS) allows an unauthorized attacker to deny service over a network.
CVE-2026-83654High· 7.8Missing authentication for critical function in Windows Modern Device Management (MDM) allows an authorized attacker to elevate privileges locally.
Missing authentication for critical function in Windows Modern Device Management (MDM) allows an authorized attacker to elevate privileges locally.
CVE-2026-83652High· 7.8Heap-based buffer overflow in Windows NTFS allows an authorized attacker to elevate privileges locally.
Heap-based buffer overflow in Windows NTFS allows an authorized attacker to elevate privileges locally.
CVE-2026-83651Medium· 6.5Out-of-bounds read in Windows GDI allows an unauthorized attacker to disclose information over a network.
Out-of-bounds read in Windows GDI allows an unauthorized attacker to disclose information over a network.
CVE-2026-83650High· 7.8Heap-based buffer overflow in Windows Media allows an authorized attacker to elevate privileges locally.
Heap-based buffer overflow in Windows Media allows an authorized attacker to elevate privileges locally.
CVE-2026-83649Medium· 6.5Out-of-bounds read in Windows Local Security Authority Subsystem Service (LSASS) allows an authorized attacker to deny service over a network.
Out-of-bounds read in Windows Local Security Authority Subsystem Service (LSASS) allows an authorized attacker to deny service over a network.
CVE-2026-83648Medium· 6.5Null pointer dereference in Active Directory Domain Services allows an authorized attacker to deny service over a network.
Null pointer dereference in Active Directory Domain Services allows an authorized attacker to deny service over a network.
CVE-2026-83647High· 7.5Out-of-bounds read in Active Directory Domain Services allows an unauthorized attacker to deny service over a network.
Out-of-bounds read in Active Directory Domain Services allows an unauthorized attacker to deny service over a network.
CVE-2026-83646Medium· 4.8Url redirection to untrusted site ('open redirect') in Active Directory Federation Services (AD FS) allows an authorized attacker to perform spoofing over a network.
Url redirection to untrusted site ('open redirect') in Active Directory Federation Services (AD FS) allows an authorized attacker to perform spoofing over a network.
CVE-2026-83645High· 7.5Allocation of resources without limits or throttling in Active Directory Federation Services (AD FS) allows an unauthorized attacker to deny service over a network.
Allocation of resources without limits or throttling in Active Directory Federation Services (AD FS) allows an unauthorized attacker to deny service over a network.
CVE-2026-83644High· 7.0Use after free in Windows Audio Service allows an authorized attacker to elevate privileges locally.
Use after free in Windows Audio Service allows an authorized attacker to elevate privileges locally.