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A request smuggling vulnerability exists in Envoy due to its incorrect handling of HTTP upgrade headers. Specifically, Envoy accepts a 200 OK response with an Upgrade header as a valid protocol switch, contrary to RFC 7230, which specifies that only a 101 Switching Protocols response should be accepted for protocol upgrades. If an attacker can trick a backend server into adding an Upgrade header to a 200 response, this can lead to request smuggling through Envoy.
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No public exploit code observed for this vulnerability.
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Every observed campaign linking this CVE to a named adversary.
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Cross-references every affected SKU, including bundled OEM variants.
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