Skip to content
Heist/ feed
Back to feed
Medium

Security advisory

Type: advisorySources: OSVCVE: 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.

Products
Not specified
Affected versions
Not specified
Fixed versions
Not specified
CVEs
CVE-2016-6329
Confirmed fixed CVEs
Not specified
Updated in this feed
1 Nov 2026, 05:31 UTC · Revision 1

Source evidence

CVE-2016-6329

core-osv · Original source

Published 31 Jan 2017, 22:59 UTC

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.

osv:CVE-2016-6329
Complete source record
{
  "id": "2f7334c99335122d2e418d918f8306cb20c6c2da4eb711c1175cd20fc372c5ce",
  "url": "https://osv.dev/vulnerability/CVE-2016-6329",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "CVE-2016-6329",
    "summary": "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.",
    "evidence": "osv:CVE-2016-6329",
    "products": [],
    "severity": "medium",
    "structured": {
      "id": "CVE-2016-6329",
      "aliases": [
        "CVE-2016-6329"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/openvpn/openvpn",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "last_affected": "117dadc02d163a3e93c28ef7bd296c8dfa1f6156"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:openvpn:openvpn:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "last_affected": "2.3.14"
                      }
                    ],
                    "source": "CPE_RANGE"
                  }
                ]
              }
            }
          ],
          "versions": [
            "v2.3.14",
            "v2.3.13",
            "contains",
            "v2.3.12",
            "v2.3.11",
            "v2.3.10",
            "v2.3.9",
            "v2.3.8",
            "v2.3.7",
            "v2.3.6",
            "v2.3.5",
            "v2.3.4",
            "v2.3.3",
            "v2.3.2",
            "v2.3.1",
            "v2.3.0",
            "v2.3_rc2",
            "v2.3_rc1",
            "v2.3_beta1",
            "v2.3_alpha3",
            "v2.3_alpha2",
            "v2.3-alpha1",
            "v2.2-RC2",
            "v2.2-RC",
            "v2.2-beta5",
            "v2.2-beta4",
            "v2.1.3",
            "v2.1.2",
            "v2.1.1",
            "v2.1.0",
            "v2.1_rc22",
            "v2.1_rc21",
            "v2.1_rc20",
            "v2.1_rc19",
            "v2.1_rc18",
            "v2.1_rc17",
            "v2.1_rc16",
            "v2.1_rc15",
            "v2.1_rc14",
            "v2.1_rc13",
            "v2.1_rc12",
            "v2.1_rc11",
            "v2.1_rc10",
            "v2.1_rc9",
            "v2.1_rc8",
            "v2.1_rc7",
            "v2.1_rc6",
            "v2.1_rc5",
            "v2.1_rc4",
            "v2.1_rc3",
            "v2.1_rc2",
            "v2.1_rc1"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2016-6329.json"
          }
        }
      ],
      "modified": "2026-10-24T10:30:29.969449713Z",
      "provider": "osv",
      "references": [
        "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/"
      ],
      "provider_metadata": {
        "unresolved_ranges": [
          {
            "cpes": [
              "cpe:2.3:a:openvpn:openvpn:*:*:*:*:*:*:*:*"
            ],
            "vendor_product": "openvpn:openvpn",
            "extracted_events": [
              {
                "range": [
                  {
                    "last_affected": "2.3.14"
                  }
                ],
                "source": "CPE_RANGE"
              }
            ]
          }
        ]
      }
    },
    "related_cves": [
      {
        "value": "CVE-2016-6329",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 432461,
  "published_at": "2017-01-31T22:59:00.377+00:00"
}