CVE-2016-6329

MEDIUM

OpenVPN - Info Disclosure

Title source: llm

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.

References (10)

[Permissions Required, Third Party Advisory] http://www-01.ibm.com/support/docview.wss?uid=nas8N1021697

[Third Party Advisory] http://www-01.ibm.com/support/docview.wss?uid=swg21991482

[Third Party Advisory] http://www-01.ibm.com/support/docview.wss?uid=swg21995039

[Third Party Advisory, VDB Entry] http://www.securityfocus.com/bid/92631

[Third Party Advisory, VDB Entry] http://www.securitytracker.com/id/1036695

[Vendor Advisory] https://cert-portal.siemens.com/productcert/pdf/ssa-556833.pdf

[Vendor Advisory] https://community.openvpn.net/openvpn/wiki/SWEET32

[Third Party Advisory] https://h20566.www2.hpe.com/portal/site/hpsc/public/kb/docDisplay?docId=emr_na-c05369403

[Third Party Advisory] https://security.gentoo.org/glsa/201611-02

[Technical Description, Third Party Advisory] https://sweet32.info/

Scores

CVSS v3 5.9

EPSS 0.0553

EPSS Percentile 90.1%

Attack Vector NETWORK

CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N

Classification

CWE

CWE-310 CWE-200

Status published

Affected Products (2)

openvpn/openvpn < 2.3.14

n/a/n/a

Timeline

Published Jan 31, 2017

Tracked Since Feb 18, 2026