There are multiple HTTP smuggling and cache poisoning issues when clients making malicious requests interact with Apache Traffic Server (ATS). This affects versions 6.0.0 to 6.2.2 and 7.0.0 to 7.1.3. To resolve this issue users running 6.x should upgrade to 6.2.3 or later versions and 7.x users should upgrade to 7.1.4 or later versions.
https://www.debian.org/security/2018/dsa-4282
https://github.com/apache/trafficserver/pull/3251
https://github.com/apache/trafficserver/pull/3231
https://github.com/apache/trafficserver/pull/3201