Vulnerability · Published Jul 13, 2023 · Assigned by GitHub_M

CVE-2023-35945Envoy vulnerable to HTTP/2 memory leak in nghttp2 codec

High 7.5

In plain English

A high-severity uncontrolled resource consumption in envoy from envoyproxy. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 1.7% (higher than 77% of all known vulnerabilities).

Severity (CVSS 3.1)7.5High

Exploit odds (30 days)1.7%top 23.4% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack toolingNoneno public tooling known

Official description

Envoy is a cloud-native high-performance edge/middle/service proxy. Envoy’s HTTP/2 codec may leak a header map and bookkeeping structures upon receiving `RST_STREAM` immediately followed by the `GOAWAY` frames from an upstream server. In nghttp2, cleanup of pending requests due to receipt of the `GOAWAY` frame skips de-allocation of the bookkeeping structure and pending compressed header. The error return [code path] is taken if connection is already marked for not sending more requests due to `GOAWAY` frame. The clean-up code is right after the return statement, causing memory leak. Denial of service through memory exhaustion. This vulnerability was patched in versions(s) 1.26.3, 1.25.8, 1.24.9, 1.23.11.

Affected products (as reported)

Vendor	Product	Versions
envoyproxy	envoy	>= 1.26.0, < 1.26.3>= 1.25.0, < 1.25.8>= 1.24.0, < 1.24.9>= 1.23.0, < 1.23.11

Weakness: CWE-400 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

In plain English

Official description

Affected products (as reported)

References