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    <lastBuildDate>Wed, 07 Oct 2026 07:47:05 +0000</lastBuildDate>
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      <title>CVE-2024-45397 — H2O alllows bypassing address-based access control with 0-RTT</title>
      <link>https://cve.radiocsirt.org/vuln/cve-2024-45397</link>
      <description>&lt;p&gt;&lt;strong&gt;Affected:&lt;/strong&gt; h2o&lt;/p&gt;
&lt;p&gt;h2o is an HTTP server with support for HTTP/1.x, HTTP/2 and HTTP/3. When an HTTP request using TLS/1.3 early data on top of TCP Fast Open or QUIC 0-RTT packets is received and the IP-address-based access control is used, the access control does not detect and prohibit HTTP requests conveyed by packets with a spoofed source address. This behavior allows attackers on the network to execute HTTP requests from addresses that are otherwise rejected by the address-based access control. The vulnerability has been addressed in commit 15ed15a. Users may disable the use of TCP FastOpen and QUIC to mitigate the issue.&lt;/p&gt;</description>
      <content:encoded>&lt;p&gt;&lt;strong&gt;Affected:&lt;/strong&gt; h2o&lt;/p&gt;
&lt;p&gt;h2o is an HTTP server with support for HTTP/1.x, HTTP/2 and HTTP/3. When an HTTP request using TLS/1.3 early data on top of TCP Fast Open or QUIC 0-RTT packets is received and the IP-address-based access control is used, the access control does not detect and prohibit HTTP requests conveyed by packets with a spoofed source address. This behavior allows attackers on the network to execute HTTP requests from addresses that are otherwise rejected by the address-based access control. The vulnerability has been addressed in commit 15ed15a. Users may disable the use of TCP FastOpen and QUIC to mitigate the issue.&lt;/p&gt;</content:encoded>
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