CVEvulnerability

CVE-2016-6329

5.9 MEDIUM Published 2017-01-31 Modified 2026-06-17 Official page ↗

Status: Modified
Published: 2017-01-31
Last modified: 2026-06-17
Assigner: [email protected]
CVSS 3.0 ([email protected]): 5.9 MEDIUM — CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N
CVSS 2.0 ([email protected]): 4.3 MEDIUM — AV:N/AC:M/Au:N/C:P/I:N/A:N
Weaknesses: CWE-200, CWE-310

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.

Affected configurations

• openvpn openvpn (<= 2.3.14)

Weakness · not in database (1)

CWE-310

Weakness · CWE (1)

CWE-200 Exposure of Sensitive Information to an Unauthorized Actor weakness

References

http://www-01.ibm.com/support/docview.wss?uid=nas8N1021697 Permissions Required, 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
http://www.securityfocus.com/bid/92631 Third Party Advisory, VDB Entry
http://www.securitytracker.com/id/1036695 Third Party Advisory, VDB Entry
https://cert-portal.siemens.com/productcert/pdf/ssa-556833.pdf cert-portal.siemens.com
https://community.openvpn.net/openvpn/wiki/SWEET32 Vendor 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 Third Party Advisory
https://sweet32.info/ Technical Description, Third Party Advisory
http://www-01.ibm.com/support/docview.wss?uid=nas8N1021697 Permissions Required, 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
http://www.securityfocus.com/bid/92631 Third Party Advisory, VDB Entry
http://www.securitytracker.com/id/1036695 Third Party Advisory, VDB Entry
https://cert-portal.siemens.com/productcert/pdf/ssa-556833.pdf cert-portal.siemens.com
https://community.openvpn.net/openvpn/wiki/SWEET32 Vendor 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 Third Party Advisory
https://sweet32.info/ Technical Description, Third Party Advisory