CVE-2026-83843: Windows Internet Key Exchange (IKE) Extension Denial of Service Vulnerability
Out-of-bounds read in Windows Internet Key Exchange (IKE) Protocol allows an unauthorized attacker to deny service over a network.
Other sources
Windows Internet Key Exchange (IKE) Extension Denial of Service Vulnerability
— Microsoft
Affected Software
Remediation
Recommended actions to resolve this vulnerability, in priority order.
- Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 10.0.26300.9711Patch KB5127648 - Upgrade
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Fixed in 10.0.17763.9376Patch KB5126651 - Upgrade
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Fixed in 10.0.20348.5761Patch KB5126655 - Upgrade
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Fixed in 6.2.9200.26434Patch KB5126835 - Upgrade
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Fixed in 10.0.26200.9711Patch KB5127648 - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 10.0.19044.7807Patch KB5126657 - Upgrade
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Fixed in 6.3.9600.23470Patch KB5126836 - Upgrade
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Fixed in 10.0.14393.9612Patch KB5126868 - Upgrade
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Fixed in 10.0.28000.3231Patch KB5127646 - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 10.0.26100.33650Patch KB5126646 - Upgrade
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Fixed in 10.0.22631.7652Patch KB5126653 - Upgrade
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Fixed in 10.0.26100.9711Patch KB5127648
Event History
Frequently Asked Questions
What access does an attacker need to exploit this issue?
The attacker can exploit the vulnerability remotely over a network without authentication or user interaction. The attack complexity is rated low.
What is the expected impact of successful exploitation?
Successful exploitation can deny service by triggering an out-of-bounds read in the Windows IKE Protocol. The supplied severity vector indicates availability impact only, with no stated confidentiality or integrity impact.
Which systems should be assessed for exposure?
Assess Microsoft Windows 10 and 11, plus Windows Server 2012, 2012 R2, 2016, 2019, 2022, and 2025 systems. Prioritize hosts where the Windows Internet Key Exchange functionality is reachable over the network.