CVE-2021-32566: Apache Traffic Server

High severity, CVSS 7.5. EPSS: 2.4% chance of exploitation in the next 30 days.

Improper Input Validation vulnerability in HTTP/2 of Apache Traffic Server allows an attacker to DOS the server. This issue affects Apache Traffic Server 7.0.0 to 7.1.12, 8.0.0 to 8.1.1, 9.0.0 to 9.0.1.

Affected products

• Apache Traffic Server: from 7.0.0, up to and including 7.1.12; from 8.0.0, up to and including 8.1.1; from 9.0.0, up to and including 9.0.1
• Debian Debian Linux: version 10.0 only

Published 2021-06-30. Last modified 2026-06-17.