High severity · published Jan 10, 2023
CVE-2023-21677
Windows Internet Key Exchange (IKE) Extension Denial of Service Vulnerability
7.5
CVSS
2%
EPSS
No
On KEV
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
None
Integrity
None
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)2.0% · higher than 81% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
W1
Windows 10 1607 · Microsoft
All versions, or not specified · source: NVD
W1
Windows 10 1809 · Microsoft
All versions, or not specified · source: NVD
W1
Windows 10 20h2 · Microsoft
All versions, or not specified · source: NVD
W1
Windows 10 21h2 · Microsoft
All versions, or not specified · source: NVD
W1
Windows 10 22h2 · Microsoft
All versions, or not specified · source: NVD
W1
Windows 11 21h2 · Microsoft
All versions, or not specified · source: NVD
W1
Windows 11 22h2 · Microsoft
All versions, or not specified · source: NVD
WS
Windows Server 2016 · Microsoft
All versions, or not specified · source: NVD
WS
Windows Server 2019 · Microsoft
All versions, or not specified · source: NVD
WS
Windows Server 2022 · Microsoft
All versions, or not specified · source: NVD
Affected product
W1
Windows 10 1607
Microsoft
More from Windows 10 1607
9.8
CVE-2026-33824
Windows Internet Key Exchange (IKE) Service Extensions Remote Code Execution Vulnerability
9.8
CVE-2017-8543
Microsoft Windows Search Remote Code Execution Vulnerability
8.8
CVE-2026-96951
Windows Shell Security Feature Bypass Vulnerability
8.8
CVE-2026-21510
Windows Shell Security Feature Bypass Vulnerability
8.8
CVE-2026-21513
MSHTML Framework Security Feature Bypass Vulnerability