CVE-2020-9494

Name: CVE-2020-9494
Creator: NVD / NIST
Published: 2020-06-24T16:15:11.067+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.5/10EPSS 3.91%

Last modified Jun 17, 2026

CVE-2020-9494 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. Apache Traffic Server 6.0.0 to 6.2.3, 7.0.0 to 7.1.10, and 8.0.0 to 8.0.7 is vulnerable to certain types of HTTP/2 HEADERS frames that can cause the server to allocate a large amount of memory and spin the thread.. EPSS estimates a 3.91% chance of exploitation in the next 30 days.

Description

Apache Traffic Server 6.0.0 to 6.2.3, 7.0.0 to 7.1.10, and 8.0.0 to 8.0.7 is vulnerable to certain types of HTTP/2 HEADERS frames that can cause the server to allocate a large amount of memory and spin the thread.

Metrics

CVSS 3.1

7.5/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

EPSS Probability

3.91%

89.0th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-770

Affected Software

Vendor	Product	Versions
Apache	Traffic Server	>= 6.0.0, <= 6.2.3
Apache	Traffic Server	>= 7.0.0, <= 7.1.10
Apache	Traffic Server	>= 8.0.0, <= 8.0.7
Debian	Debian Linux	10.0

References

http://www.openwall.com/lists/oss-security/2021/03/01/2Not Applicable
https://lists.apache.org/thread.html/rf7f86917f42fdaf904d99560cba0c016e03baea6244c47efeb60ecbe%40%3Cdev.trafficserver.apache.org%3EMailing List, Vendor Advisory
https://www.debian.org/security/2020/dsa-4710Third Party Advisory
http://www.openwall.com/lists/oss-security/2021/03/01/2Not Applicable
https://lists.apache.org/thread.html/rf7f86917f42fdaf904d99560cba0c016e03baea6244c47efeb60ecbe%40%3Cdev.trafficserver.apache.org%3EMailing List, Vendor Advisory
https://www.debian.org/security/2020/dsa-4710Third Party Advisory

Timeline

Published: Jun 24, 2020
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2020-9494?

How severe is CVE-2020-9494?

CVE-2020-9494 has a CVSS score of 7.5/10 (HIGH severity). The EPSS model estimates a 3.91% probability of exploitation in the next 30 days.

How do I fix CVE-2020-9494?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2020-9494?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST