What is CVE-2020-8663?

CVE-2020-8663 is a high-severity vulnerability in Envoyproxy Envoy, classified under Uncontrolled Resource Consumption. CVSS score: 7.5/10. Published 2020-07-01.

How severe is CVE-2020-8663?

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

Resource exhaustion in Envoyproxy Envoy

CVE-2020-8663

Envoy version 1.14.2, 1.13.2, 1.12.4 or earlier may exhaust file descriptors and/or memory when accepting too many connections.

Vulnerability class: DoS (Denial of Service)

Published 2020-07-01 · 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: 0.015 (72.8th percentile), scored 2026-09-29.

Low probability of exploitation in the next 30 days, but still tracked. 73rd percentile — 72.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.015 · newest: 0.015 · change: 0.000

Affected products

Envoyproxy Envoy

Weakness classification (CWE)

CWE-400 — Uncontrolled Resource Consumption

References

www.envoyproxy.io/docs/envoy/v1.13.1/intro/version_history (Release Notes, Vendor Advisory)
github.com/envoyproxy/envoy/security/advisories/GHSA-v8q7-fq78-4997 (Third Party Advisory)

Frequently asked questions

What is CVE-2020-8663?: CVE-2020-8663 is a high-severity vulnerability in Envoyproxy Envoy, classified under Uncontrolled Resource Consumption. CVSS score: 7.5/10. Published 2020-07-01.
How severe is CVE-2020-8663?: High severity. CVSS v3 base score is 7.5 out of 10.