CVE-2021-27577: Apache Traffic Server

High severity, CVSS 7.5. EPSS: 3.4% chance of exploitation in the next 30 days.

Incorrect handling of url fragment vulnerability of Apache Traffic Server allows an attacker to poison the cache. 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 8.0 only

Published 2021-06-29. Last modified 2026-06-17.