EUVD-2026-44021
GHSA-c374-c6v8-hm9v
Severity by source
AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N
Network-reachable client-side flaw; user must connect to attacker server (UI:R); no integrity or availability impact; uninitialized memory can expose high-value data (C:H).
Primary rating from Vendor (microsoft).
CVSS VectorVendor: microsoft
Lifecycle Timeline
2DescriptionCVE.org
Use of uninitialized resource in Windows RDP allows an unauthorized attacker to disclose information over a network.
AnalysisAI
Windows Remote Desktop Protocol (RDP) client leaks sensitive memory contents due to use of an uninitialized resource (CWE-908), allowing a network-accessible attacker to disclose potentially high-value information from a victim's system. Exploitation requires user interaction - a victim must connect to an attacker-controlled RDP endpoint - making this a client-side information disclosure attack affecting Windows 10 (all supported versions from 1607 through 22H2), Windows 11 (24H2 through 26H1), and Windows Server 2012 through 2025. No public exploit code has been identified and no active exploitation is confirmed; however, the CVSS confidentiality impact is rated High, meaning exposed memory could include credentials or session tokens.
Technical ContextAI
The root cause is CWE-908 - use of uninitialized resource - within the Windows RDP stack. When uninitialized memory buffers or resources are processed during an RDP session, their contents, which may include residual data from prior allocations, can be transmitted to or read by an attacker-controlled server. RDP (Remote Desktop Protocol) is Microsoft's proprietary protocol for remote desktop sessions over TCP port 3389. CPE data identifies affected software spanning cpe:2.3:a:microsoft:windows_10_version_1607 through cpe:2.3:a:microsoft:windows_server_2012_r2, covering both client and server SKUs. The CVSS vector AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N indicates the flaw is exploitable from the network with low complexity but requires the victim user to actively initiate an RDP connection to an attacker-controlled host, consistent with a client-side parsing vulnerability.
RemediationAI
Apply the vendor-released security updates through Windows Update or WSUS, targeting the fixed build for each affected version: Windows 10 1607 and Server 2016 to build 10.0.14393.9339 or later; Windows 10 1809 and Server 2019 to 10.0.17763.9020 or later; Windows 10 21H2 to 10.0.19044.7548 or later; Windows 10 22H2 to 10.0.19045.7548 or later; Windows 11 24H2 and Server 2025 to 10.0.26100.8875 or later; Windows 11 25H2 to 10.0.26200.8875 or later; Windows 11 26H1 to 10.0.28000.2525 or later; Server 2022 to 10.0.20348.5386 or later; Server 2012 to 6.2.9200.26226 or later; Server 2012 R2 to 6.3.9600.23291 or later. Full details are at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-55003. As a compensating control where patching cannot be applied immediately, restrict outbound RDP connections (TCP 3389) from endpoints via host-based firewall or network egress policy to prevent users from connecting to arbitrary or untrusted RDP servers - this directly blocks the UI:R-dependent attack path. Note this control does not protect legitimate connections to attacker-compromised internal RDP servers.
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Same weakness CWE-908 – Use of Uninitialized Resource
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External POC / Exploit Code
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