Description
Envoy is an open source edge and service proxy designed for cloud-native applications. From 1.23.0 until 1.35.11, 1.36.7, 1.37.3, and 1.38.1, a vulnerability has been identified in Envoy's zstd decompressor implementation (ZstdDecompressorImpl). When zstd decompression is enabled, processing a specially crafted, highly compressed zstd payload can lead to massive memory allocation. An attacker can exploit this to cause severe memory exhaustion, potentially resulting in an Out-Of-Memory (OOM) kill and Denial of Service (DoS) for the Envoy proxy. This vulnerability is fixed in 1.35.11, 1.36.7, 1.37.3, and 1.38.1.
CVSS breakdown
CVSS 3.1
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High
Affected products
- envoyproxy / envoy>= 1.38.0, < 1.38.1 – >= 1.38.0, < 1.38.1
- envoyproxy / envoy>= 1.37.0, < 1.37.3 – >= 1.37.0, < 1.37.3
- envoyproxy / envoy>= 1.36.0, < 1.36.7 – >= 1.36.0, < 1.36.7
- envoyproxy / envoy>= 1.23.0, < 1.35.11 – >= 1.23.0, < 1.35.11