CVE-2026-69789

HIGH CVSS 3.1: 7.5 EPSS 0.42%
Updated Oct 14, 2026
Microsoft
Parameter Value
CVSS 7.5 (HIGH)
Affected Versions 10.0.14393.0 — 6.3.9600.23398
Fixed In 10.0.17763.9245
Type CWE-122 (Heap-based Buffer Overflow)
Vendor Microsoft
Public PoC No

Heap-based buffer overflow in Reliable Multicast Transport Driver (RMCAST) allows an unauthorized attacker to execute code over an adjacent network.

Attack Parameters

Attack Vector
Adjacent
Requires local network access
Attack Complexity
High
Difficult to exploit
Privileges Required
None
No privileges needed
User Interaction
None
No user interaction needed

Impact Assessment

Confidentiality
High
Complete data leak
Integrity
High
Complete data modification
Availability
High
Complete denial of service

CVSS Vector v3.1

Vulnerable Products 20

Configuration From (including) Up to (excluding)
Microsoft Windows_10_1809
cpe:2.3:o:microsoft:windows_10_1809:*:*:*:*:*:*:x86:*
10.0.17763.0 10.0.17763.9245
Microsoft Windows_Server_2019
cpe:2.3:o:microsoft:windows_server_2019:*:*:*:*:*:*:*:*
10.0.17763.0 10.0.17763.9245
Microsoft Windows_Server_2019
cpe:2.3:o:microsoft:windows_server_2019:*:*:*:*:*:*:*:*
10.0.17763.0 10.0.17763.9245
Microsoft Windows_Server_2022
cpe:2.3:o:microsoft:windows_server_2022:*:*:*:*:*:*:*:*
10.0.20348.0 10.0.20348.5622
Microsoft Windows_10_21h2
cpe:2.3:o:microsoft:windows_10_21H2:*:*:*:*:*:*:x86:*
10.0.19044.0 10.0.19044.7725
Microsoft Windows_10_22h2
cpe:2.3:o:microsoft:windows_10_22H2:*:*:*:*:*:*:x64:*
10.0.19045.0 10.0.19045.7725
Microsoft Windows_Server_2025
cpe:2.3:o:microsoft:windows_server_2025:*:*:*:*:*:*:*:*
10.0.26100.0 10.0.26100.33438
Microsoft Windows_11_25h2
cpe:2.3:o:microsoft:windows_11_25H2:*:*:*:*:*:*:arm64:*
10.0.26200.0 10.0.26200.9445
Microsoft Windows_11_23h2
cpe:2.3:o:microsoft:windows_11_23H2:*:*:*:*:*:*:arm64:*
10.0.22631.0 10.0.22631.7582
Microsoft Windows_11_23h2
cpe:2.3:o:microsoft:windows_11_23H2:*:*:*:*:*:*:x64:*
10.0.22631.0 10.0.22631.7582
Microsoft Windows_11_24h2
cpe:2.3:o:microsoft:windows_11_24H2:*:*:*:*:*:*:arm64:*
10.0.26100.0 10.0.26100.9445
Microsoft Windows_Server_2025
cpe:2.3:o:microsoft:windows_server_2025:*:*:*:*:*:*:*:*
10.0.26100.0 10.0.26100.33438
Microsoft Windows_11_26h1
cpe:2.3:o:microsoft:windows_11_26H1:*:*:*:*:*:*:x64:*
10.0.28000.0 10.0.28000.2954
Microsoft Windows_10_1607
cpe:2.3:o:microsoft:windows_10_1607:*:*:*:*:*:*:x86:*
10.0.14393.0 10.0.14393.9512
Microsoft Windows_Server_2016
cpe:2.3:o:microsoft:windows_server_2016:*:*:*:*:*:*:*:*
10.0.14393.0 10.0.14393.9512
Microsoft Windows_Server_2016
cpe:2.3:o:microsoft:windows_server_2016:*:*:*:*:*:*:*:*
10.0.14393.0 10.0.14393.9512
Microsoft Windows_Server_2012
cpe:2.3:o:microsoft:windows_server_2012:*:*:*:*:*:*:x64:*
6.2.9200.0 6.2.9200.26349
Microsoft Windows_Server_2012
cpe:2.3:o:microsoft:windows_server_2012:*:*:*:*:*:*:x64:*
6.2.9200.0 6.2.9200.26349
Microsoft Windows_Server_2012_R2
cpe:2.3:o:microsoft:windows_server_2012_R2:*:*:*:*:*:*:x64:*
6.3.9600.0 6.3.9600.23398
Microsoft Windows_Server_2012_R2
cpe:2.3:o:microsoft:windows_server_2012_R2:*:*:*:*:*:*:x64:*
6.3.9600.0 6.3.9600.23398