CVE-2023-21757
Windows Layer 2 Tunneling Protocol (L2TP) Denial of Service Vulnerability
HIGH
7.5
CVSS Score
Published: January 10, 2023 at 12:00 AM UTC
Updated: June 17, 2026 at 05:33 AM UTC
18 products affected across 1 vendorWindows Server 2016Windows Server 2019Windows Server 2012
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Severity
HIGH7.5
Exploit prediction
EPSS 2%
SSVC
No known exploit
Description
Windows Layer 2 Tunneling Protocol (L2TP) Denial of Service Vulnerability
Affected
Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.
10.0.10240.0 ≤ v < 10.0.10240.1968510.0.10240.0
Affected range stops below 10.0.10240.19685, so it looks safe — our inference, not a vendor statement
10.0.14393.0 ≤ v < 10.0.14393.564810.0.14393.0
Affected range stops below 10.0.14393.5648, so it looks safe — our inference, not a vendor statement
Affected range stops below 10.0.17763.3887, so it looks safe — our inference, not a vendor statement
Affected range stops below 6.1.7601.26321, so it looks safe — our inference, not a vendor statement
6.3.0 ≤ v < 6.3.9600.207786.3.0
Affected range stops below 6.3.9600.20778, so it looks safe — our inference, not a vendor statement
All versions
Affected range stops below 6.0.6003.21872, so it looks safe — our inference, not a vendor statement
Affected range stops below 6.1.7601.26321, so it looks safe — our inference, not a vendor statement
Affected range stops below 6.2.9200.24075, so it looks safe — our inference, not a vendor statement
Affected range stops below 6.3.9600.20778, so it looks safe — our inference, not a vendor statement
Remediation
No guide yetNo remediation guidance has been written for this CVE yet. What the record does show:
Patch and advisory references
References (1)
Vendor Advisory
Source: [email protected]
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2023-21757SSVC — Action Prioritization
SSVCNo known exploitAutomatablePartial impact
SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.
CVSS
7.5HIGHmicrosoft
Vector?
Quick Info
StatusMODIFIED
CWE
CWE-476NVD-CWE-noinfo
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