CVE-2020-12603

Red Hat Security Advisory: Red Hat OpenShift Service Mesh 1.1 servicemesh-proxy security update

7.5 HighFix available

Envoy version 1.14.2, 1.13.2, 1.12.4 or earlier may consume excessive amounts of memory when proxying HTTP/2 requests or responses with many small (i.e. 1 byte) data frames.

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

1.45%Up 0.8 points since Apr 14, 2021

What each source reports

NVD Score used 7.5

Envoy version 1.14.2, 1.13.2, 1.12.4 or earlier may consume excessive amounts of memory when proxying HTTP/2 requests or responses with many small (i.e. 1 byte) data frames.

Record: CVE-2020-12603
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-400
Updated: 2026-11-02

CVE List No score

Envoy version 1.14.2, 1.13.2, 1.12.4 or earlier may consume excessive amounts of memory when proxying HTTP/2 requests or responses with many small (i.e. 1 byte) data frames.

Record: CVE-2020-12603
Updated: 2026-11-02

EUVDEUVD-2020-4905 No score

Envoy version 1.14.2, 1.13.2, 1.12.4 or earlier may consume excessive amounts of memory when proxying HTTP/2 requests or responses with many small (i.e. 1 byte) data frames.

Record: EUVD-2020-4905
Updated: 2026-11-03

OSV 7.5

Envoy version 1.14.2, 1.13.2, 1.12.4 or earlier may consume excessive amounts of memory when proxying HTTP/2 requests or responses with many small (i.e. 1 byte) data frames.

Record: CVE-2020-12603
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-2020:2798 7.5

Red Hat Security Advisory: Red Hat OpenShift Service Mesh 1.1 servicemesh-proxy security update

Record: RHSA-2020:2798
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-2020:2864 7.5

Red Hat Security Advisory: Red Hat OpenShift Service Mesh 1.0 servicemesh-proxy security update

Record: RHSA-2020:2864
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-2020-12603 No score

Envoy version 1.14.2, 1.13.2, 1.12.4 or earlier may consume excessive amounts of memory when proxying HTTP/2 requests or responses with many small (i.e. 1 byte) data frames.

Record: BIT-envoy-2020-12603
Updated: 2026-11-02

OSVopenSUSE-SU-2022:0065-1 No score

Security update for envoy-proxy

This update for envoy-proxy fixes the following issues:

Update to 1.14.6:

CVE-2020-35471: Fixed a denial of service via dropped and truncated UDP datagrams (boo#1180121).

Record: openSUSE-SU-2022:0065-1
Updated: 2026-11-02

Affected products

envoyproxy envoy

Affected packages

Affected packages
Package	Affected	Fixed
`envoy` Bitnami	before 1.12.5, 1.13.2 up to 1.13.3, 1.14.2 up to 1.14.3	1.12.51.13.31.14.3
`servicemesh-proxy` Red Hat:service_mesh:1.1::el8 From an advisory covering 4 CVEs	before 0:1.1.4-2.el8	0:1.1.4-2.el8
`servicemesh-proxy` Red Hat:service_mesh:1.0::el8 From an advisory covering 4 CVEs	before 0:1.0.11-1.el8	0:1.0.11-1.el8
`envoy-proxy` SUSE:Package Hub 15 SP3 From an advisory covering 5 CVEs	before 1.14.6-bp153.3.4.1	1.14.6-bp153.3.4.1
`envoy-proxy` openSUSE:Leap 15.3 From an advisory covering 5 CVEs	before 1.14.6-bp153.3.4.1	1.14.6-bp153.3.4.1

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-2020-12603 is a high vulnerability (CVSS 7.5) in Envoyproxy Envoy, published July 1, 2020. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 1.45%, the 73rd percentile. Fixed in envoy 1.12.5.

References

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