CVE-2019-9510Public exploit

Locked-session access via cached-credential RDP reconnection

Published Jan 15, 2020 · Updated Sep 17, 2024

Authentication bypass in Microsoft Windows Server 2019 and later allows local users to access a locked RDP session after reconnection. Automatic Reconnection reuses credentials cached by the RDP client and restores the remote session to an unlocked desktop without invoking the lock-screen credential prompt. Exploitation requires access to the RDP client and interruption of its network connection; Microsoft disputes that this behavior crosses a security boundary.

CVSS severity5.3
Medium
EPSS probability1.32%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Authentication bypass in Microsoft Windows Server 2019 and later allows local users to access a locked RDP session after reconnection. Automatic Reconnection reuses credentials cached by the RDP client and restores the remote session to an unlocked desktop without invoking the lock-screen credential prompt. Exploitation requires access to the RDP client and interruption of its network connection; Microsoft disputes that this behavior crosses a security boundary.

The record

CVE
CVE-2019-9510
Published
Jan 15, 2020
Updated
Sep 17, 2024
Vendor
Microsoft
Product
Windows Server
Classifications
CWE-288, CWE-755, T1563.002
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Jan 15, 2020CVE publishedPublication date reported by the CVE source.
  2. Sep 17, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=2019 <2019*

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

Microsoft · Windows Serverversion=2019 <2019*

Published CVSS scores

4.6NIST NVDAV:L/AC:L/Au:N/C:P/I:P/A:P
4.1CERT/CCAV:L/AC:L/Au:N/C:P/I:P/A:P/E:POC/RL:U/RC:C
7.8NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
5.3CERT/CCCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-288Authentication Bypass Using an Alternate Path or Channel
CWE-755Improper Handling of Exceptional Conditions
T1563.002Remote Service Session Hijacking: RDP Hijacking

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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