What is CVE-2016-5396?

CVE-2016-5396 is a high-severity vulnerability in Apache Traffic Server, classified under CWE-399. CVSS score: 7.5/10. Published 2017-04-17.

How severe is CVE-2016-5396?

High severity. CVSS v3 base score is 7.5 out of 10.

Vulnerability in Apache Traffic Server

CVE-2016-5396

Apache Traffic Server 6.0.0 to 6.2.0 are affected by an HPACK Bomb Attack.

Published 2017-04-17 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

EPSS exploit prediction

EPSS: 0.029 (86.4th percentile), scored 2026-10-05.

Low probability of exploitation in the next 30 days, but still tracked. 86th percentile — 86.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.026 · newest: 0.029 · change: +0.003

Affected products

Apache Traffic Server — versions 6.0.0, 6.1.0, 6.1.1
Apache Software Foundation Traffic Server — versions 6.0.0 to 6.2.0

Weakness classification (CWE)

CWE-399

References

issues.apache.org/jira/browse/TS-5019 (Patch, Third Party Advisory, Issue Tracking)
www.securityfocus.com/bid/97945 (vdb-entry)
www.securitytracker.com/id/1038275 (vdb-entry)

Frequently asked questions

What is CVE-2016-5396?: CVE-2016-5396 is a high-severity vulnerability in Apache Traffic Server, classified under CWE-399. CVSS score: 7.5/10. Published 2017-04-17.
How severe is CVE-2016-5396?: High severity. CVSS v3 base score is 7.5 out of 10.