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	<title>Apoorv Kothari &#8211; Noise</title>
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		<title>Defending QUIC from acknowledgement-based DDoS attacks</title>
		<link>https://noise.getoto.net/2025/10/29/defending-quic-from-acknowledgement-based-ddos-attacks/</link>
		
		<dc:creator><![CDATA[Apoorv Kothari]]></dc:creator>
		<pubDate>Wed, 29 Oct 2025 13:00:00 +0000</pubDate>
				<category><![CDATA[protocols]]></category>
		<category><![CDATA[QUIC]]></category>
		<category><![CDATA[research]]></category>
		<category><![CDATA[security]]></category>
		<category><![CDATA[vulnerabilities]]></category>
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					<description><![CDATA[We identified and patched two DDoS vulnerabilities in our QUIC implementation related to packet acknowledgements. Cloudflare customers were not affected. We examine the "Optimistic ACK" attack vector and our solution, which dynamically skips packet numbers to validate client behavior. ]]></description>
		
		
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