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Servers and applications

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.

Severity
Medium 5.9
Published
31 Jan 2017
Last changed
17 Jun 2026
Added to UpHeron
1 Nov 2026
Exploit chance
5.9% in the next 30 daysHigher than 93% of CVEs. EPSS by FIRST, 11 Nov 2026
Weakness
Information exposure (CWE-200)CWE-310
Attack
Over the network · Only under certain conditions · No login needed · No user action needed
Attacker can
Read data
CVSS vector
CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N
Sources
NVD

Affected software

SoftwareAffected versions
OpenVPNServers and applications · cpe:a:openvpn:openvpn
  • Every version up to 2.3.14

References

  • NVD https://nvd.nist.gov/vuln/detail/CVE-2016-6329
  • CVE.org https://www.cve.org/CVERecord?id=CVE-2016-6329