Vulnerability Monitor

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CVE-2016-4694

The Apache HTTP Server in Apple OS X before 10.12 and OS X Server before 5.2 follows RFC 3875 section 4.1.18 and therefore does not protect applications from the presence of untrusted CGI 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, aka an "httpoxy" issue, a related issue to CVE-2016-5387.

Security Impact Summary

This vulnerability carries a CRITICAL severity rating with a CVSS v3.1 score of 9.1, indicating it can be exploited remotely over the network with relatively low complexity without requiring user interaction and does not require pre-existing privileges . The vulnerability impacts confidentiality (data exposure), integrity (unauthorized modifications), for affected systems. Impacting 2 products from apple, from apple organizations running these solutions should prioritize assessment and patching.

Historical Context

First disclosed in 2016, this vulnerability was reported during a period defined by widespread IoT adoption challenges, mobile security concerns, and the emergence of advanced persistent threat (APT) techniques. Contemporary mitigation strategies focused on secure development practices and third-party component vetting.

Published

2016-09-25T10:59:03.450

Last Modified

2026-05-06T22:30:45.220

Status

Modified

Source

[email protected]

Severity

CVSSv3.0: 9.1 (CRITICAL)

CVSSv2 Vector

AV:N/AC:L/Au:N/C:P/I:P/A:P

Access Vector: NETWORK
Access Complexity: LOW
Authentication: NONE
Confidentiality Impact: PARTIAL
Integrity Impact: PARTIAL
Availability Impact: PARTIAL

Exploitability Score

10.0

Impact Score

6.4

Weaknesses

Type: Primary
CWE-284

Affected Vendors & Products

Type	Vendor	Product	Version/Range	Vulnerable?
Operating System	apple	mac_os_x	≤ 10.11.6	Yes
Operating System	apple	os_x_server	≤ 5.1	Yes

References

http://lists.apple.com/archives/security-announce/2016/Sep/msg00006.html Mailing List, Vendor Advisory ([email protected])
http://lists.apple.com/archives/security-announce/2016/Sep/msg00009.html Mailing List, Vendor Advisory ([email protected])
http://www.securityfocus.com/bid/93060 ([email protected])
http://www.securitytracker.com/id/1036853 ([email protected])
https://support.apple.com/HT207170 Vendor Advisory ([email protected])
https://support.apple.com/HT207171 Vendor Advisory ([email protected])
http://lists.apple.com/archives/security-announce/2016/Sep/msg00006.html Mailing List, Vendor Advisory (af854a3a-2127-422b-91ae-364da2661108)
http://lists.apple.com/archives/security-announce/2016/Sep/msg00009.html Mailing List, Vendor Advisory (af854a3a-2127-422b-91ae-364da2661108)
http://www.securityfocus.com/bid/93060 (af854a3a-2127-422b-91ae-364da2661108)
http://www.securitytracker.com/id/1036853 (af854a3a-2127-422b-91ae-364da2661108)
https://support.apple.com/HT207170 Vendor Advisory (af854a3a-2127-422b-91ae-364da2661108)
https://support.apple.com/HT207171 Vendor Advisory (af854a3a-2127-422b-91ae-364da2661108)

How SecUtils Interprets This CVE

SecUtils normalizes and enriches National Vulnerability Database (NVD) records by standardizing vendor and product identifiers, aggregating vulnerability metadata from both NVD and MITRE sources, and providing structured context for security teams. For apple's affected products, we extract Common Platform Enumeration (CPE) data, Common Weakness Enumeration (CWE) classifications, CVSS severity metrics, and reference data to enable rapid vulnerability prioritization and asset correlation. This record contains no exploit code, proof-of-concept instructions, or attack methodologies—only defensive intelligence necessary for patch management, risk assessment, and security operations.