Severity by source
AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Remote unauthenticated RDP reachability with no user interaction yields AV:N/AC:L/PR:N/UI:N; pure info-leak of uninitialized memory gives C:H and I:N/A:N.
Primary rating from Vendor (microsoft).
CVSS VectorNVD
Lifecycle Timeline
5DescriptionNVD
Use of uninitialized resource in Windows RDP allows an unauthorized attacker to disclose information over a network.
AnalysisAI
Information disclosure in the Windows Remote Desktop Protocol (RDP) stack lets a remote, unauthenticated attacker read uninitialized memory over the network, potentially leaking sensitive data such as memory contents or fragments of prior sessions. It affects a broad range of Windows client and server builds from Windows 10 1607 and Server 2012 through Windows 11 26H1 and Server 2025. Reported by Microsoft with a patch available; no public exploit identified at time of analysis, and EPSS exploitation probability is low at 0.89%.
Technical ContextAI
The flaw is rooted in CWE-908 (Use of Uninitialized Resource): the RDP service processes network data using a memory resource (buffer or structure) that was never fully initialized before use, so leftover heap or stack contents from prior allocations can be returned to the remote peer. RDP is Microsoft's proprietary remote-access protocol, typically served on TCP/UDP 3389 by the Remote Desktop Services / Terminal Services component. The affected CPE set spans desktop editions (Windows 10 1607/1809/21H2/22H2, Windows 11 24H2/25H2/26H1) and server editions (Windows Server 2012, 2012 R2, 2016, 2019, 2022, 2025, including Server Core installations), indicating the vulnerable code lives in a shared RDP component present across the Windows codebase. Because the impact is disclosure only (C:H/I:N/A:N), the uninitialized data is leaked rather than used to corrupt state or execute code.
RemediationAI
Apply the Microsoft security update for CVE-2026-58533 via the MSRC Update Guide (https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-58533); Patch available per vendor advisory, with fixed builds per edition - for example Windows 11 24H2/25H2 at 10.0.26100.8875, Server 2022 at 10.0.20348.5386, Server 2025 at 10.0.26100.33158, Server 2019/1809 at 10.0.17763.9020, and Server 2012 R2 at 6.3.9600.23291. Where patching must be staged, reduce exposure by restricting RDP (TCP/UDP 3389) so it is not reachable from the internet - place it behind a VPN or Remote Desktop Gateway, enforce Network Level Authentication (NLA) to require authentication before the vulnerable session negotiation, and use firewall rules or Just-In-Time access to limit source IPs; the trade-off is added access friction and that NLA does not guarantee the pre-auth leak path is fully closed, so these controls reduce but do not eliminate risk and are not a substitute for the patch.
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Same weakness CWE-908 – Use of Uninitialized Resource
View allSame technique Information Disclosure
View allShare
External POC / Exploit Code
Leaving vuln.today
EUVD-2026-44287
GHSA-6557-4f9j-97wg