EUVD-2026-43934
GHSA-32x5-wjvf-4c65
Severity by source
AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Remote unauthenticated network access to the RDP listener with no user interaction, and a buffer over-read that discloses memory only, so C:H but I:N/A:N.
Primary rating from Vendor (microsoft).
CVSS VectorNVD
Lifecycle Timeline
5DescriptionNVD
Buffer over-read in Windows RDP allows an unauthorized attacker to disclose information over a network.
AnalysisAI
Information disclosure in Microsoft Windows Remote Desktop Protocol (RDP) allows a remote, unauthenticated attacker to read out-of-bounds memory over the network, potentially leaking sensitive process data such as memory addresses that defeat ASLR, session state, or credential fragments. The flaw (CWE-126, buffer over-read) affects a broad range of Windows client and server releases from Windows Server 2012 through Windows Server 2025 and Windows 10/11 including 26H1. There is no public exploit identified at time of analysis and CISA SSVC records exploitation status as none; EPSS estimates a modest 0.67% (48th percentile) probability of exploitation.
Technical ContextAI
The vulnerability lives in Windows Remote Desktop Protocol, the RDP stack (typically termdd/rdpcorets and related components) that services incoming connections on TCP/UDP 3389. CWE-126 (Buffer Over-read) means the RDP parser reads memory beyond the bounds of an allocated buffer while processing attacker-controlled protocol data, returning adjacent heap or stack contents to the client. Because impact is confined to confidentiality (C:H, I:N, A:N) the defect discloses memory rather than corrupting it or granting code execution. The CPE and EUVD data pin the affected code to Microsoft's core RDP implementation shipped across Windows 10 (1607-22H2), Windows 11 (24H2, 25H2, 26H1), and Windows Server 2012 through 2025, including Server Core installations, indicating the flaw sits in shared platform RDP code rather than an edition-specific feature.
RemediationAI
Vendor-released patch: apply the Microsoft security updates that raise each build to at or above the fixed versions in the advisory (for example Windows 11 24H2 to 10.0.26100.8875, Windows Server 2025 to 10.0.26100.33158, Server 2022 to 10.0.20348.5386, Server 2019/Windows 10 1809 to 10.0.17763.9020, Server 2016/Windows 10 1607 to 10.0.14393.9339, Server 2012 R2 to 6.3.9600.23291, Server 2012 to 6.2.9200.26226) via Windows Update or WSUS, sourced from https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-50445. Until patched, reduce exposure by not publishing RDP directly to the internet: place RDP behind a Remote Desktop Gateway or VPN, enforce Network Level Authentication (NLA) so an attacker must authenticate before reaching much of the vulnerable parsing path (trade-off: shrinks but does not fully eliminate the pre-auth surface), and restrict TCP/UDP 3389 at the host and perimeter firewall to known management subnets (trade-off: can disrupt legitimate remote admin if allowlists are incomplete). Disable RDP entirely on hosts that do not require it, and prioritize any internet-facing or jump-box RDP endpoints first.
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Same weakness CWE-126 – Buffer Over-read
View allSame technique Buffer Overflow
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External POC / Exploit Code
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