---
id: CVE-2020-8659
title: >-
  CNCF Envoy through 1.13.0 may consume excessive amounts of memory when
  proxying HTTP/1.1 requests or responses with many small (i.e
summary: >-
  CNCF Envoy through 1.13.0 may consume excessive amounts of memory when
  proxying HTTP/1.1 requests or responses with many small (i.e. 1 byte) chunks.
severity: high
cvss: 7.5
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H'
cwe:
  - CWE-770
vendor: envoyproxy
product: envoy
affected:
  - envoy <= 1.13.0
  - openshift_service_mesh = 1.0
  - debian_linux = 9.0
published: '2020-03-04'
updated: '2026-10-02'
sourceUpdated: '2026-10-02T21:00:25.163'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2020-8659'
references:
  - url: 'https://access.redhat.com/errata/RHSA-2020:0734'
    label: cve@mitre.org
  - url: >-
      https://github.com/envoyproxy/envoy/security/advisories/GHSA-jwcm-4pwp-c2qv
    label: cve@mitre.org
  - url: 'https://lists.debian.org/debian-lts-announce/2022/05/msg00025.html'
    label: cve@mitre.org
  - url: 'https://www.envoyproxy.io/docs/envoy/v1.13.1/intro/version_history'
    label: cve@mitre.org
  - url: 'https://access.redhat.com/errata/RHSA-2020:0734'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: >-
      https://github.com/envoyproxy/envoy/security/advisories/GHSA-jwcm-4pwp-c2qv
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://lists.debian.org/debian-lts-announce/2022/05/msg00025.html'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://www.envoyproxy.io/docs/envoy/v1.13.1/intro/version_history'
    label: af854a3a-2127-422b-91ae-364da2661108
tags:
  - nvd
epss: 0.01887
epssPercentile: 0.7879
ingestedAt: '2026-10-02T22:33:09.805Z'
---

## Overview

CNCF Envoy through 1.13.0 may consume excessive amounts of memory when proxying HTTP/1.1 requests or responses with many small (i.e. 1 byte) chunks.

## Affected

- `envoy <= 1.13.0`
- `openshift_service_mesh = 1.0`
- `debian_linux = 9.0`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.