What is CVE-2020-12603?

CVE-2020-12603 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-2020-12603?

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

Resource exhaustion in Envoyproxy Envoy

CVE-2020-12603

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.

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: 0.014 (72.3th percentile), scored 2026-09-30.

Low probability of exploitation in the next 30 days, but still tracked. 72nd percentile — 72.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.014 · newest: 0.014 · change: 0.000

Affected products

Envoyproxy Envoy — versions 1.13.2, 1.14.2

Weakness classification (CWE)

CWE-400 — Uncontrolled Resource Consumption

References

github.com/envoyproxy/envoy-setec/issues/80 (Broken Link)
github.com/envoyproxy/envoy/security/advisories/GHSA-pc38-4q6c-85p6 (Third Party Advisory)

Frequently asked questions

What is CVE-2020-12603?: CVE-2020-12603 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-2020-12603?: High severity. CVSS v3 base score is 7.5 out of 10.