Envoy Proxy Detection of Error Condition Without Action Vulnerability - CVE-2024-27919

Envoy is a cloud-native open-source edge and service proxy. In versions 1.29.0 and 1.29.1 theEnvoy HTTP/2 protocol stack is vulnerable to the flood of CONTINUATION frames. Envoy39s HTTP/2 codec does not reset a request when header map limits have been exceeded. This allows an attacker to send an sequence of CONTINUATION frames without the END_HEADERS bit set causing unlimited memory consumption. This can lead to denial of service through memory exhaustion. Users should upgrade to versions 1.29.2 to mitigate the effects of the CONTINUATION flood. Note that this vulnerability is a regression in Envoy version 1.29.0 and 1.29.1 only. As a workaround downgrade to version 1.28.1 or earlier or disable HTTP/2 protocol for downstream connections.