CVE-2020-8659

Red Hat Security Advisory: Red Hat OpenShift Service Mesh 1.0.9 servicemesh-proxy security update

7.5 High

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.

Attack profile

How easy it is to exploit

Attack vector: Network
Complexity: Low
Privileges needed: None
User interaction: None

What an attacker can affect

Confidentiality: None
Integrity: None
Availability: High

Exploit likelihood

1.89%Up 1.1 points since Apr 14, 2021

What each source reports

NVD Score used 7.5

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.

Record: CVE-2020-8659
CVSS 3.1: 7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CVSS 2.0: 5.0 MediumAV:N/AC:L/Au:N/C:N/I:N/A:P
Weakness: CWE-770
Updated: 2026-11-02

CVE List No score

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.

Record: CVE-2020-8659
Updated: 2026-11-02

EUVDEUVD-2020-29507 No score

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.

Record: EUVD-2020-29507
Updated: 2026-11-03

OSV 7.5

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.

Record: CVE-2020-8659
CVSS 3.1: 7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Updated: 2026-11-02

OSVRHSA-2020:0734 7.5

Red Hat Security Advisory: Red Hat OpenShift Service Mesh 1.0.9 servicemesh-proxy security update

Record: RHSA-2020:0734
CVSS 3.1: 7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Updated: 2026-11-02

OSVBIT-envoy-2020-8659 No score

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.

Record: BIT-envoy-2020-8659
Updated: 2026-11-02

Affected products

Affected packages

Affected packages
Package	Affected	Fixed
`envoy` Bitnami	through 1.13.0	None known
`servicemesh-proxy` Red Hat:service_mesh:1.0::el8 From an advisory covering 4 CVEs	before 0:1.0.9-2.el8	0:1.0.9-2.el8

History

History
Recorded	Changed	Sources
Nov 6, 2026	affected, facts
Nov 3, 2026	aliases	EUVD
Nov 2, 2026	first indexed	CVE List, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2020-8659 is a high vulnerability (CVSS 7.5) in Envoyproxy Envoy, published March 4, 2020. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 1.89%, the 79th percentile. No source names a fixed version.

References

Show 19 moreShow less