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CVE-2016-6329

5.9 · MEDIUM

OpenVPN, when using a 64-bit block cipher, makes it easier for remote attackers to obtain cleartext data via a birthday attack against a long-duration encrypted session, as demonstrated by an HTTP-…

Published Jan 31, 2017CWE-200EPSS 5.94%

Overview

CVE-2016-6329 is a medium-severity vulnerability. It was published on January 31, 2017 and has a CVSS 3.0 base score of 5.9 (MEDIUM).

This vulnerability has a CVSS 3.0 base score of 5.9, rated MEDIUM. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical description

OpenVPN, when using a 64-bit block cipher, makes it easier for remote attackers to obtain cleartext data via a birthday attack against a long-duration encrypted session, as demonstrated by an HTTP-over-OpenVPN session using Blowfish in CBC mode, aka a "Sweet32" attack.

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

Refwww-01.ibm.com/support/docview.wss?uid=nas8N1021697Refwww-01.ibm.com/support/docview.wss?uid=swg21991482Refwww-01.ibm.com/support/docview.wss?uid=swg21995039Refwww.securityfocus.com/bid/92631Refwww.securitytracker.com/id/1036695Refcert-portal.siemens.com/productcert/pdf/ssa-556833.pdfRefcommunity.openvpn.net/openvpn/wiki/SWEET32Refh20566.www2.hpe.com/portal/site/hpsc/public/kb/docDisplay?docId=emr_na-c05369403Refsecurity.gentoo.org/glsa/201611-02Refsweet32.info/

How CyberStrike helps

Frequently asked questions

What is CVE-2016-6329?

CVE-2016-6329 is a medium-severity vulnerability. It was published on January 31, 2017 and has a CVSS 3.0 base score of 5.9 (MEDIUM).

How severe is CVE-2016-6329?

This vulnerability has a CVSS 3.0 base score of 5.9, rated MEDIUM. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2016-6329?

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-2016-6329?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2016-6329 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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