Microsoft Windows RDP can bypass the Windows lock screen
Published Jan 15, 2020
7.8
HIGHCVSS 3.1
EPSS 1.32%
Description
A vulnerability in Microsoft Windows 10 1803 and Windows Server 2019 and later systems can allow authenticated RDP-connected clients to gain access to user sessions without needing to interact with the Windows lock screen. Should a network anomaly trigger a temporary RDP disconnect, Automatic Reconnection of the RDP session will be restored to an unlocked state, regardless of how the remote system was left. By interrupting network connectivity of a system, an attacker with access to a system being used as a Windows RDP client can gain access to a connected remote system, regardless of whether or not the remote system was locked. This issue affects Microsoft Windows 10, version 1803 and later, and Microsoft Windows Server 2019, version 2019 and later.
Affected products
-
- Version 1803StatusaffectedConstraints<10 *
- Version
-
- Version 2019StatusaffectedConstraints<2019*
- Version
Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).
| Vendor | Product | Default status | Versions | ||||||
|---|---|---|---|---|---|---|---|---|---|
| Microsoft | Windows 10 or newer system using RDP | n/a |
| ||||||
| Microsoft | Windows Server | n/a |
|
- 1803
- n/a
No data.
No Red Hat product state for this CVE.
No package ranges for this CVE.
Remediation
Vendor solution
Disable RDP automatic reconnection on RDP servers. Disconnect RDP sessions instead of locking them.
Metrics
No CVSS v4.0 score for this CVE.
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
1 other source (CVE.org) ▾
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L
No CVSS v3.0 score for this CVE.
AV:L/AC:L/Au:N/C:P/I:P/A:P
This CVE is not in the KEV list.
No CISA SSVC assessment for this CVE yet.
Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 2, 2026.
Score over time
2021–2026- EPSS v1
- EPSS v2
- EPSS v3
- EPSS v4
- EPSS v5
Percentile over time
- EPSS v1
- EPSS v2
- EPSS v3
- EPSS v4
- EPSS v5
Table of values (19 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 2, 2026 | 1.32% (0.01322) | 69.87th | v5 (v2026.06.15) |
| Jun 15, 2026 | 1.27% (0.01272) | 65.94th | v5 (v2026.06.15) |
| Nov 18, 2025 | 1.92% (0.01923) | 81.88th | v4 (v2025.03.14) |
| Mar 17, 2025 | 0.73% (0.00730) | 71.00th | v4 (v2025.03.14) |
| Dec 12, 2024 | 0.05% (0.00053) | 23.11th | v3 (v2023.03.01) |
| May 28, 2024 | 0.06% (0.00064) | 27.60th | v3 (v2023.03.01) |
| May 22, 2024 | 0.05% (0.00053) | 20.77th | v3 (v2023.03.01) |
| Jan 8, 2024 | 0.05% (0.00053) | 18.72th | v3 (v2023.03.01) |
| Dec 22, 2023 | 0.07% (0.00068) | 28.49th | v3 (v2023.03.01) |
| Jun 20, 2023 | 0.05% (0.00053) | 18.68th | v3 (v2023.03.01) |
| Mar 7, 2023 | 0.04% (0.00045) | 12.34th | v3 (v2023.03.01) |
| Mar 6, 2023 | 2.08% (0.02084) | 79.92th | v2 (v2022.01.01) |
| Dec 24, 2022 | 2.08% (0.02084) | 79.50th | v2 (v2022.01.01) |
| Apr 1, 2022 | 1.74% (0.01743) | 74.11th | v2 (v2022.01.01) |
| Feb 4, 2022 | 2.30% (0.02299) | 58.26th | v2 (v2022.01.01) |
| Feb 3, 2022 | 35.03% (0.35026) | 97.90th | v1 |
| Jan 6, 2022 | 35.03% (0.35026) | 97.88th | v1 |
| Sep 1, 2021 | 10.73% (0.10726) | 95.25th | v1 |
| Apr 14, 2021 | 10.73% (0.10726) | 0.00th | v1 |
References (4)
- https://docs.microsoft.com/en-us/openspecs/windows_protocols/ms-rdpbcgr/e729948a-3f4e-4568-9aef-d355e30b5389 x_refsource_MISCPatchVendor Advisory
- https://docs.microsoft.com/en-us/previous-versions/windows/it-pro/windows-server-2008-R2-and-2008/cc732713%28v=ws.11%29 x_refsource_MISC
- https://social.technet.microsoft.com/Forums/windowsserver/en-US/1fd171de-a1b5-4721-86bf-082e4a375049/rds-2019-but-probably-other-versions-as-well-locked-rdp-session-logs-in-after-session-reconnect x_refsource_MISCPatchVendor Advisory
- https://www.kb.cert.org/vuls/id/576688/ third-party-advisoryx_refsource_CERT-VNThird Party AdvisoryUS Government Resource
| Link | Providers | Tags |
|---|---|---|
| https://docs.microsoft.com/en-us/openspecs/windows_protocols/ms-rdpbcgr/e729948a-3f4e-4568-9aef-d355e30b5389 | x_refsource_MISCPatchVendor Advisory | |
| https://docs.microsoft.com/en-us/previous-versions/windows/it-pro/windows-server-2008-R2-and-2008/cc732713%28v=ws.11%29 | x_refsource_MISC | |
| https://social.technet.microsoft.com/Forums/windowsserver/en-US/1fd171de-a1b5-4721-86bf-082e4a375049/rds-2019-but-probably-other-versions-as-well-locked-rdp-session-logs-in-after-session-reconnect | x_refsource_MISCPatchVendor Advisory | |
| https://www.kb.cert.org/vuls/id/576688/ | third-party-advisoryx_refsource_CERT-VNThird Party AdvisoryUS Government Resource |
Change history (0)
No recorded changes yet.