Description
Use of uninitialized resource in Windows RDP allows an unauthorized attacker to disclose information over a network.
Published: 2026-07-14
Score: 6.5 Medium
EPSS: < 1% Very Low
KEV: No
Impact: n/a
Action: n/a
AI Analysis

Impact

The vulnerability arises from the use of an uninitialized resource in the Windows Remote Desktop Client, which allows an unauthorized attacker to disclose information over a network. The weakness enables the attacker to gain confidential data, and it is categorized as CWE‑908, reflecting scenarios where uninitialized variables permit information leakage.

Affected Systems

Affected products include Microsoft Windows 10 versions 1607, 1809, 21H2, and 22H2; Microsoft Windows 11 versions 24H2, 25H2, and 26H1; and Microsoft Windows Server releases 2012, 2012 R2, 2016, 2019, 2022, and 2025, including both standard and Server Core installations. All affected systems run the Windows Remote Desktop Client component.

Risk and Exploitability

The CVSS score is 6.5, indicating a moderate severity. The EPSS score is below 1 %, suggesting a low probability of exploitation under current conditions, and the vulnerability is not listed in the CISA KEV catalog. Based on the description, the likely attack vector is network‑based, where an attacker initiates an RDP session (or attempts a connection) from an unauthorized host to trigger the uninitialized resource and capture sensitive information. Exploitation would require network connectivity to the target machine and typically no elevated privileges on the victim.

Generated by OpenCVE AI on July 31, 2026 at 06:13 UTC.

Remediation

No vendor fix or workaround currently provided.

OpenCVE Recommended Actions

  • Download and install the Microsoft security update for CVE‑2026‑58546 from the MSRC update guide.
  • If Remote Desktop is not required, disable the feature on affected systems to prevent exposure.
  • Restrict inbound RDP connections to trusted IP addresses or VPN endpoints using firewall rules.

Generated by OpenCVE AI on July 31, 2026 at 06:13 UTC.

Tracking

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Advisories

No advisories yet.

History

Tue, 14 Jul 2026 18:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Tue, 14 Jul 2026 17:45:00 +0000

Type Values Removed Values Added
Description Use of uninitialized resource in Windows RDP allows an unauthorized attacker to disclose information over a network.
Title Windows Remote Desktop Client Information Disclosure Vulnerability
First Time appeared Microsoft
Microsoft windows 10 1607
Microsoft windows 10 1809
Microsoft windows 10 21h2
Microsoft windows 10 22h2
Microsoft windows 11 24h2
Microsoft windows 11 25h2
Microsoft windows 11 26h1
Microsoft windows Server 2012
Microsoft windows Server 2012 R2
Microsoft windows Server 2016
Microsoft windows Server 2019
Microsoft windows Server 2022
Microsoft windows Server 2025
Weaknesses CWE-908
CPEs cpe:2.3:o:microsoft:windows_10_1607:*:*:*:*:*:*:x86:*
cpe:2.3:o:microsoft:windows_10_1809:*:*:*:*:*:*:x86:*
cpe:2.3:o:microsoft:windows_10_21H2:*:*:*:*:*:*:x86:*
cpe:2.3:o:microsoft:windows_10_22H2:*:*:*:*:*:*:x64:*
cpe:2.3:o:microsoft:windows_11_24H2:*:*:*:*:*:*:arm64:*
cpe:2.3:o:microsoft:windows_11_25H2:*:*:*:*:*:*:arm64:*
cpe:2.3:o:microsoft:windows_11_26H1:*:*:*:*:*:*:x64:*
cpe:2.3:o:microsoft:windows_server_2012:*:*:*:*:*:*:x64:*
cpe:2.3:o:microsoft:windows_server_2012_R2:*:*:*:*:*:*:x64:*
cpe:2.3:o:microsoft:windows_server_2016:*:*:*:*:*:*:*:*
cpe:2.3:o:microsoft:windows_server_2019:*:*:*:*:*:*:*:*
cpe:2.3:o:microsoft:windows_server_2022:*:*:*:*:*:*:*:*
cpe:2.3:o:microsoft:windows_server_2025:*:*:*:*:*:*:*:*
Vendors & Products Microsoft
Microsoft windows 10 1607
Microsoft windows 10 1809
Microsoft windows 10 21h2
Microsoft windows 10 22h2
Microsoft windows 11 24h2
Microsoft windows 11 25h2
Microsoft windows 11 26h1
Microsoft windows Server 2012
Microsoft windows Server 2012 R2
Microsoft windows Server 2016
Microsoft windows Server 2019
Microsoft windows Server 2022
Microsoft windows Server 2025
References
Metrics cvssV3_1

{'score': 6.5, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N/E:U/RL:O/RC:C'}


Subscriptions

Microsoft Windows 10 1607 Windows 10 1809 Windows 10 21h2 Windows 10 22h2 Windows 11 24h2 Windows 11 25h2 Windows 11 26h1 Windows Server 2012 Windows Server 2012 R2 Windows Server 2016 Windows Server 2019 Windows Server 2022 Windows Server 2025
cve-icon MITRE

Status: PUBLISHED

Assigner: microsoft

Published:

Updated: 2026-07-30T20:27:38.897Z

Reserved: 2026-07-01T04:33:41.870Z

Link: CVE-2026-58546

cve-icon Vulnrichment

Updated: 2026-07-14T17:58:38.127Z

cve-icon NVD

No data.

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-07-31T06:15:04Z

Weaknesses
  • CWE-908

    Use of Uninitialized Resource