What is CVE-2017-5660?

CVE-2017-5660 is a high-severity vulnerability in Apache Traffic Server, classified under Improper Input Validation. CVSS score: 8.6/10. Published 2018-02-27.

How severe is CVE-2017-5660?

High severity. CVSS v3 base score is 8.6 out of 10.

Improper input validation in Apache Traffic Server

CVE-2017-5660

There is a vulnerability in Apache Traffic Server (ATS) 6.2.0 and prior and 7.0.0 and prior with the Host header and line folding. This can have issues when interacting with upstream proxies and the wrong host being used.

Vulnerability class: Drupalgeddon 2 (CVE-2018-7600)

Published 2018-02-27 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 8.6 (High). Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:H/A:N.

EPSS exploit prediction

EPSS: 0.019 (79.9th percentile), scored 2026-10-22.

Low probability of exploitation in the next 30 days, but still tracked. 80th percentile — 79.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.019 · newest: 0.019 · change: 0.000

Affected products

Apache Traffic Server — versions 6.2.1, 6.2.2, 7.0.0
Apache Software Foundation Traffic Server — versions 7.0.0 and prior, 6.2.0 and prior
Debian Linux — versions 9.0

Weakness classification (CWE)

CWE-20 — Improper Input Validation

References

www.debian.org/security/2018/dsa-4128 (vendor-advisory, Third Party Advisory)
lists.apache.org/thread.html/22d84783d94c53a5132ec89f002fe5165c87561a9428bcb671… (mailing-list)

Frequently asked questions

What is CVE-2017-5660?: CVE-2017-5660 is a high-severity vulnerability in Apache Traffic Server, classified under Improper Input Validation. CVSS score: 8.6/10. Published 2018-02-27.
How severe is CVE-2017-5660?: High severity. CVSS v3 base score is 8.6 out of 10.