CVE & CISA-KEV Catalog

CVE-2016-5385

HIGHEPSS 99th pctl
8.1
CVSS v3
NVD

Description

PHP through 7.0.8 does not attempt to address RFC 3875 section 4.1.18 namespace conflicts and therefore does not protect applications from the presence of untrusted client data in the HTTP_PROXY environment variable, which might allow remote attackers to redirect an application's outbound HTTP traffic to an arbitrary proxy server via a crafted Proxy header in an HTTP request, as demonstrated by (1) an application that makes a getenv('HTTP_PROXY') call or (2) a CGI configuration of PHP, aka an "httpoxy" issue.

CWE-601Open Redirect

How to fix

Remediation Available
libapache2-mod-php5Ubuntu
Fixed in:5.5.9+dfsg-1ubuntu4.19USN-3045-1
libapache2-mod-php7.0Ubuntu
Fixed in:7.0.8-0ubuntu0.16.04.2USN-3045-1
php5Ubuntu
Fixed in:5.5.9+dfsg-1ubuntu4.19USN-3045-1
php5-cgiUbuntu
Fixed in:5.5.9+dfsg-1ubuntu4.19USN-3045-1
php5-cliUbuntu
Fixed in:5.5.9+dfsg-1ubuntu4.19USN-3045-1
php5-fpmUbuntu
Fixed in:5.5.9+dfsg-1ubuntu4.19USN-3045-1
php7.0Ubuntu
Fixed in:7.0.8-0ubuntu0.16.04.2USN-3045-1
php7.0-cgiUbuntu
Fixed in:7.0.8-0ubuntu0.16.04.2USN-3045-1
php7.0-cliUbuntu
Fixed in:7.0.8-0ubuntu0.16.04.2USN-3045-1
php7.0-fpmUbuntu
Fixed in:7.0.8-0ubuntu0.16.04.2USN-3045-1

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Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork
Attack ComplexityHigh
Privileges RequiredNone
User InteractionNone
ScopeUnchanged

Impact

ConfidentialityHigh
IntegrityHigh
AvailabilityHigh

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

Exploit Intelligence

50.43%probability of exploitation in 30 days
99thpercentile

Very high risk: more likely to be exploited than 99% of all known CVEs.

References

Related Vulnerabilities

Other CWE-601 (Open Redirect) vulnerabilities, ordered by exploit likelihood. View all

CVESeverityCVSSEPSSExploitedFix
CVE-2025-4123High7.698%-Fix
CVE-2018-11784Medium4.394%-Fix
CVE-2021-22881Medium6.187%-Fix
CVE-2022-45402Medium6.182%-Fix
CVE-2017-1000117High8.878%-Fix
CVE-2019-10098Medium6.174%-Fix
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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-05-06.