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mtls

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Discussions on WindowsForum.com about mTLS (mutual TLS) cover two main areas: a security vulnerability in KubeVirt (CVE-2025-64434) where inadequate peer-certificate verification allowed TLS identity spoofing between components, and a practical issue with TLS 1.3 and IIS Express on Windows 11 where client-certificate (mTLS) workflows break due to kernel-level TLS handling in http.sys and Schannel. The IIS Express problem requires workarounds as a permanent fix is unlikely. These threads highlight mTLS implementation challenges in both Kubernetes and Windows development environments.
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    CVE-2025-64434: KubeVirt TLS Identity Spoof Demystified

    When a Certificate Isn’t Enough: Inside CVE-2025-64434, the KubeVirt TLS Identity Spoof On November 2025, a medium-severity vulnerability — tracked as CVE-2025-64434 — was published that exposed a subtle but dangerous weakness in how KubeVirt handled mutual TLS between its components. The short...
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    TLS 1.3 & IIS Express on Windows 11: mTLS Breakage, Workarounds, and Outlook

    Windows developers and administrators who depend on client-certificate (mTLS) workflows will need to keep using workarounds: a structural limitation introduced by TLS 1.3 and the way Windows handles TLS in kernel (http.sys / Schannel) means IIS Express on Windows 11 cannot reliably request a...
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    • Thread
    • apphost-config client certificate developer tools http.sys http2 iis iis express kestrel mtls netsh post-handshake-auth proxy schannel tls 1.3 tls-compatibility tls-renegotiation visual studio windows 11 windows server
    • Replies: 0
    • Forum: Windows News
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