What is CVE-2015-7519?

CVE-2015-7519 is a low-severity vulnerability in Phusionpassenger Phusion Passenger, classified under Improper Input Validation. CVSS score: 3.7/10. Published 2016-01-08.

How severe is CVE-2015-7519?

Low severity. CVSS v3 base score is 3.7 out of 10.

Is CVE-2015-7519 known to be exploited?

1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

Improper input validation in Phusionpassenger Phusion Passenger

CVE-2015-7519

agent/Core/Controller/SendRequest.cpp in Phusion Passenger before 4.0.60 and 5.0.x before 5.0.22, when used in Apache integration mode or in standalone mode without a filtering proxy, allows remote attackers to spoof headers passed to applications by using an _ (underscore) character instead of a - (dash) character in an HTTP header, as demonstrated by an X_User header.

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

Published 2016-01-08 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 3.7 (Low). Vector: CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N.

EPSS exploit prediction

EPSS: 0.024 (83.2th percentile), scored 2026-10-02.

Low probability of exploitation in the next 30 days, but still tracked. 83rd percentile — 83.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.024 · newest: 0.024 · change: 0.000

Affected products

Phusionpassenger Phusion Passenger — versions 5.0.0, 5.0.1, 5.0.2

Weakness classification (CWE)

CWE-20 — Improper Input Validation

Public proof-of-concept exploits

ARPSyndicate/cvemon

References

lists.opensuse.org/opensuse-security-announce/2015-12/msg00024.html (vendor-advisory)
github.com/phusion/passenger/commit/ddb8ecc4ebf260e4967f57f271d4f5761abeac3e
blog.phusion.nl/2015/12/07/cve-2015-7519/ (Vendor Advisory)
puppet.com/security/cve/passenger-dec-2015-security-fixes
www.openwall.com/lists/oss-security/2015/12/07/2 (mailing-list)
bugzilla.suse.com/show_bug.cgi
www.openwall.com/lists/oss-security/2015/12/07/1 (mailing-list)
lists.debian.org/debian-lts-announce/2018/06/msg00007.html (mailing-list)

Frequently asked questions

What is CVE-2015-7519?: CVE-2015-7519 is a low-severity vulnerability in Phusionpassenger Phusion Passenger, classified under Improper Input Validation. CVSS score: 3.7/10. Published 2016-01-08.
How severe is CVE-2015-7519?: Low severity. CVSS v3 base score is 3.7 out of 10.
Is CVE-2015-7519 known to be exploited?: 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.