CVE-2016-6329
Moderate
CVE-2016-6329
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.
Exploit probability
5.9%
Published
January 31, 2017
Required by
Not available
Last source change
July 8, 2026
02 / AFFECTED SOFTWARE
Affected packages
52 explicit affected versions
03 / CONNECTIONS
Connected vulnerabilities
04 / EVIDENCE
Source records
Open Source Vulnerabilities
CVE-2016-6329
View original source
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.
05 / REFERENCES
Further evidence
- http://www-01.ibm.com/support/docview.wss?uid=nas8N1021697
- http://www-01.ibm.com/support/docview.wss?uid=swg21991482
- http://www-01.ibm.com/support/docview.wss?uid=swg21995039
- http://www.securityfocus.com/bid/92631
- http://www.securitytracker.com/id/1036695
- https://cert-portal.siemens.com/productcert/pdf/ssa-556833.pdf
- https://community.openvpn.net/openvpn/wiki/SWEET32
- https://h20566.www2.hpe.com/portal/site/hpsc/public/kb/docDisplay?docId=emr_na-c05369403
- https://security.gentoo.org/glsa/201611-02
- https://sweet32.info/