What is CVE-2020-8661?

CVE-2020-8661 is a high-severity vulnerability in Cncf Envoy, classified under Uncontrolled Resource Consumption. CVSS score: 7.5/10. Published 2020-03-04.

How severe is CVE-2020-8661?

High severity. CVSS v3 base score is 7.5 out of 10.

Is CVE-2020-8661 known to be exploited?

1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

Resource exhaustion in Cncf Envoy

CVE-2020-8661

CNCF Envoy through 1.13.0 may consume excessive amounts of memory when responding internally to pipelined requests.

Vulnerability class: DoS (Denial of Service)

Published 2020-03-04 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

EPSS exploit prediction

EPSS: 0.019 (78.5th percentile), scored 2026-09-30.

Low probability of exploitation in the next 30 days, but still tracked. 79th percentile — 78.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.019 · newest: 0.019 · change: 0.000

Affected products

Cncf Envoy
Red Hat Openshift Service Mesh — versions 1.0.9

Weakness classification (CWE)

CWE-400 — Uncontrolled Resource Consumption

Public proof-of-concept exploits

ARPSyndicate/cvemon

References

www.envoyproxy.io/docs/envoy/v1.13.1/intro/version_history (Third Party Advisory, Release Notes)
github.com/envoyproxy/envoy/security/advisories/GHSA-36cq-ww7h-p4j7 (Third Party Advisory)
access.redhat.com/errata/RHSA-2020:0734 (vendor-advisory, Third Party Advisory, Release Notes)

Frequently asked questions

What is CVE-2020-8661?: CVE-2020-8661 is a high-severity vulnerability in Cncf Envoy, classified under Uncontrolled Resource Consumption. CVSS score: 7.5/10. Published 2020-03-04.
How severe is CVE-2020-8661?: High severity. CVSS v3 base score is 7.5 out of 10.
Is CVE-2020-8661 known to be exploited?: 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.