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UK Cyber Defence
VulnerabilityModified

CVE-2016-5387

The Apache HTTP Server through 2.4.23 follows RFC 3875 section 4.1.18 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…

HIGH 8.1EPSS 55.7%

Does this matter?

EPSS puts the probability of exploitation in the next 30 days at 55.7%, higher than 99% of all known CVEs. Patch or mitigate before the next change window.

Description

The Apache HTTP Server through 2.4.23 follows RFC 3875 section 4.1.18 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, aka an "httpoxy" issue. NOTE: the vendor states "This mitigation has been assigned the identifier CVE-2016-5387"; in other words, this is not a CVE ID for a vulnerability.

CVSS 3.1
8.1 HIGHCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS
55.72% probability · 99th percentile
CISA KEV
Not listed
Affected
apache/http server · hp/system management homepage · oracle/communications user data repository · oracle/enterprise manager ops center · oracle/linux · oracle/solaris · fedoraproject/fedora · redhat/jboss web server · redhat/jboss enterprise web server · redhat/jboss core services · redhat/enterprise linux desktop · redhat/enterprise linux eus · redhat/enterprise linux server · redhat/enterprise linux server aus · redhat/enterprise linux server tus · redhat/enterprise linux workstation · debian/debian linux · canonical/ubuntu linux · opensuse/leap · opensuse/opensuse
Source
secalert@redhat.com

References

Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.