CVE-2023-41768Network attack vector

Unauthenticated code execution via L2TP use-after-free

Published Oct 10, 2023 · Updated Apr 14, 2025

Use-after-free in Windows L2TP on affected Windows releases allows remote attackers to execute code via crafted messages to an RRAS server. The L2TP message handler accesses freed memory when concurrent processing of crafted protocol messages wins a race. The target must run RRAS with L2TP enabled; successful exploitation runs code on the server without credentials.

CVSS severity8.1
High
EPSS probability1.26%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Use-after-free in Windows L2TP on affected Windows releases allows remote attackers to execute code via crafted messages to an RRAS server. The L2TP message handler accesses freed memory when concurrent processing of crafted protocol messages wins a race. The target must run RRAS with L2TP enabled; successful exploitation runs code on the server without credentials.

The record

CVE
CVE-2023-41768
Published
Oct 10, 2023
Updated
Apr 14, 2025
Vendor
Microsoft
Product
Windows 10 Version 1507
Classifications
CWE-362, CWE-416, T1210
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Oct 10, 2023CVE publishedPublication date reported by the CVE source.
  2. Apr 14, 2025Record 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=10.0.10240.0 <10.0.10240.20232

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Microsoft · Windows 10 Version 1507version=10.0.10240.0 <10.0.10240.20232
Microsoft · Windows Server 2019version=10.0.17763.0 <10.0.17763.4974
Microsoft · Windows Server 2016 (Server Core installation)version=10.0.14393.0 <10.0.14393.6351
Microsoft · Windows 11 version 21H2version=10.0.0 <10.0.22000.2538
Microsoft · Windows Server 2012 (Server Core installation)version=6.2.9200.0 <6.2.9200.24523
Microsoft · Windows Server 2012version=6.2.9200.0 <6.2.9200.24523
Microsoft · Windows 10 Version 21H2version=10.0.19043.0 <10.0.19041.3570
Microsoft · Windows Server 2016version=10.0.14393.0 <10.0.14393.6351
Microsoft · Windows Server 2008 R2 Service Pack 1version=6.1.7601.0 <6.1.7601.26769
Microsoft · Windows Server 2008 R2 Service Pack 1 (Server Core installation)version=6.1.7601.0 <6.1.7601.26769
Microsoft · Windows 10 Version 22H2version=10.0.19045.0 <10.0.19045.3570
Microsoft · Windows Server 2012 R2 (Server Core installation)version=6.3.9600.0 <6.3.9600.21620
Microsoft · Windows Server 2019 (Server Core installation)version=10.0.17763.0 <10.0.17763.4974
Microsoft · Windows 11, version 22H2version=10.0.22621.0 <10.0.22621.2428
Microsoft · Windows 10 Version 1607version=10.0.14393.0 <10.0.14393.6351
Microsoft · Windows Server 2008 Service Pack 2version=6.0.6003.0 <6.0.6003.22317
Microsoft · Windows Server 2022version=10.0.20348.0 <10.0.20348.2031
Microsoft · Windows 10 Version 1809version=10.0.0 <10.0.17763.4974; version=10.0.17763.0 <10.0.17763.4974
Microsoft · Windows Server 2012 R2version=6.3.9600.0 <6.3.9600.21620
Microsoft · Windows Server 2008 Service Pack 2 (Server Core installation)version=6.0.6003.0 <6.0.6003.22317

Published CVSS scores

8.1MicrosoftCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

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)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-362Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')
CWE-416Use After Free
T1210Exploitation of Remote Services

Public exploit references

No public exploit references are available in this record.

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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