CVE-2023-21556

HIGH

Windows L2TP - Remote Code Execution via Integer Underflow

Title source: llm
STIX 2.1

Description

Windows Layer 2 Tunneling Protocol (L2TP) Remote Code Execution Vulnerability

References (1)

Core 1
Core References

Scores

CVSS v3 8.1
EPSS 0.0146
EPSS Percentile 70.1%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

CISA SSVC

Vulnrichment
Exploitation none
Automatable no
Technical Impact total

Details

CWE
CWE-191
Status published
Products (17)
microsoft/windows_10_1607 (2 CPE variants)
microsoft/windows_10_1809 (3 CPE variants)
microsoft/windows_10_20h2 (3 CPE variants)
microsoft/windows_10_21h2 (3 CPE variants)
microsoft/windows_10_22h2 (3 CPE variants)
microsoft/windows_11_21h2 (2 CPE variants)
microsoft/windows_11_22h2 (2 CPE variants)
microsoft/windows_7 (2 CPE variants)
microsoft/windows_8.1 (2 CPE variants)
microsoft/windows_rt_8.1
... and 7 more
Published Jan 10, 2023
Tracked Since Feb 18, 2026