What is CVE-2020-9481?

CVE-2020-9481 is a high-severity vulnerability in Apache Ats, classified under Uncontrolled Resource Consumption. CVSS score: 7.5/10. Published 2020-04-27.

How severe is CVE-2020-9481?

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

Resource exhaustion in Apache Ats

CVE-2020-9481

Apache ATS 6.0.0 to 6.2.3, 7.0.0 to 7.1.9, and 8.0.0 to 8.0.6 is vulnerable to a HTTP/2 slow read attack.

Vulnerability class: DoS (Denial of Service)

Published 2020-04-27 · 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: 0.024 (83.3th percentile), scored 2026-10-03.

Low probability of exploitation in the next 30 days, but still tracked. 83rd percentile — 83.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.024 · newest: 0.024 · change: 0.000

Affected products

Apache Ats — versions 6.0.0 to 6.2.3, 7.0.0 to 7.1.9, 8.0.0 to 8.0.6
Apache Traffic Server
Debian Linux — versions 10.0

Weakness classification (CWE)

CWE-400 — Uncontrolled Resource Consumption

References

lists.apache.org/thread.html/r21ddaf0a4a973f3c43c7ff399ae50d2f858f13f87bd6a9551… (Patch, Mailing List, Third Party Advisory)
www.debian.org/security/2020/dsa-4672 (vendor-advisory, Third Party Advisory)

Frequently asked questions

What is CVE-2020-9481?: CVE-2020-9481 is a high-severity vulnerability in Apache Ats, classified under Uncontrolled Resource Consumption. CVSS score: 7.5/10. Published 2020-04-27.
How severe is CVE-2020-9481?: High severity. CVSS v3 base score is 7.5 out of 10.