CVE-2020-9494

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...

7.5 HighFix available

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.

Attack profile

How easy it is to exploit

Attack vector: Network
Complexity: Low
Privileges needed: None
User interaction: None

What an attacker can affect

Confidentiality: None
Integrity: None
Availability: High

Exploit likelihood

3.67%Up 1.2 points since Apr 14, 2021

What each source reports

NVD Score used 7.5

Record: CVE-2020-9494
CVSS 3.1: 7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CVSS 2.0: 5.0 MediumAV:N/AC:L/Au:N/C:N/I:N/A:P
Weakness: CWE-770
Updated: 2026-11-02

CVE List No score

Record: CVE-2020-9494
Updated: 2026-11-02

EUVDEUVD-2020-30301 No score

Record: EUVD-2020-30301
Updated: 2026-11-03

GitHub AdvisoriesGHSA-cw5m-934f-xqmc No score

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...

Record: GHSA-cw5m-934f-xqmc
Weakness: CWE-119
Updated: 2026-11-02

OSV 7.5

Record: CVE-2020-9494
CVSS 3.1: 7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Updated: 2026-11-02

OSVDEBIAN-CVE-2020-9494 7.5

Record: DEBIAN-CVE-2020-9494
CVSS 3.1: 7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Updated: 2026-11-02

OSVUBUNTU-CVE-2020-9494 7.5

Record: UBUNTU-CVE-2020-9494
CVSS 3.1: 7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Updated: 2026-11-02

Affected products

Affected packages

Affected packages
Package	Affected	Fixed
`trafficserver` Debian:12	before 8.0.8+ds-1	8.0.8+ds-1
`trafficserver` Debian:10	before 8.0.2+ds-1+deb10u3, plus listed versions 8.0.2+ds-18.0.2+ds-1+deb10u18.0.2+ds-1+deb10u2	8.0.2+ds-1+deb10u3
`trafficserver` Ubuntu:16.04:LTS	All versions, plus listed versions 5.3.0-2ubuntu15.3.0-2ubuntu2	None known
`trafficserver` Ubuntu:18.04:LTS	All versions, plus listed versions 7.0.0-57.1.2+ds-27.1.2+ds-2build17.1.2+ds-3	None known
`trafficserver` Ubuntu:Pro:20.04:LTS	All versions, plus listed versions 8.0.5+ds-18.0.5+ds-28.0.5+ds-2build18.0.5+ds-2ubuntu18.0.5+ds-38.0.5+ds-3ubuntu0.1~esm1	None known

History

History
Recorded	Changed	Sources
Nov 3, 2026	aliases	EUVD
Nov 2, 2026	first indexed	CVE List, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2020-9494 is a high vulnerability (CVSS 7.5) in Apache Traffic Server, published June 24, 2020. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 3.67%, the 89th percentile. Fixed in trafficserver 8.0.8+ds-1.