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CVE-2015-5739

9.8 · CRITICAL

The net/http library in net/textproto/reader.go in Go before 1.4.3 does not properly parse HTTP header keys, which allows remote attackers to conduct HTTP request smuggling attacks via a space inst…

Published Oct 18, 2017CWE-444EPSS 9.63%

Overview

CVE-2015-5739 is a critical-severity vulnerability. It was published on October 18, 2017 and has a CVSS 3.0 base score of 9.8 (CRITICAL).

This vulnerability has a CVSS 3.0 base score of 9.8, rated CRITICAL. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical description

The net/http library in net/textproto/reader.go in Go before 1.4.3 does not properly parse HTTP header keys, which allows remote attackers to conduct HTTP request smuggling attacks via a space instead of a hyphen, as demonstrated by "Content Length" instead of "Content-Length."

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Reflists.fedoraproject.org/pipermail/package-announce/2015-October/167997.htmlReflists.fedoraproject.org/pipermail/package-announce/2015-October/168029.htmlRefrhn.redhat.com/errata/RHSA-2016-1538.htmlRefseclists.org/oss-sec/2015/q3/237Refseclists.org/oss-sec/2015/q3/292Refseclists.org/oss-sec/2015/q3/294Refwww.securityfocus.com/bid/76281Refbugzilla.redhat.com/show_bug.cgi?id=1250352GitHubgithub.com/golang/go/commit/117ddcb83d7f42d6aa72241240af99ded81118e9Reflists.fedoraproject.org/pipermail/package-announce/2015-October/167997.html

How CyberStrike helps

Frequently asked questions

What is CVE-2015-5739?

CVE-2015-5739 is a critical-severity vulnerability. It was published on October 18, 2017 and has a CVSS 3.0 base score of 9.8 (CRITICAL).

How severe is CVE-2015-5739?

This vulnerability has a CVSS 3.0 base score of 9.8, rated CRITICAL. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2015-5739?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2015-5739?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2015-5739 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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