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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…
Medium5.9EPSS 5.9%
- Published
- Updated
- Reserved
- Assigned by
- redhat
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.
Timeline
ID reserved
By redhat
- 6 months later
· 6 months later
Published
- 8 years later
· 8 years later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| NVDNVD · Modified | 3.0 | Medium5.9 | CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N |
- EPSS (exploitation in 30 days)
- 5.9% · top 6.7% of all CVEs (8 Nov 2026)
Loading the EPSS history…
The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 5.9.
Weakness
Affected products
n/a
- affected n/a
References (10)
- https://sweet32.info/ (opens in a new tab)x_refsource_MISCx_transferred
- https://h20566.www2.hpe.com/portal/site/hpsc/public/kb/docDisplay?docId=emr_na-c05369403 (opens in a new tab)x_refsource_CONFIRMx_transferred
- 1036695 (opens in a new tab)vdb-entryx_refsource_SECTRACKx_transferred
- http://www-01.ibm.com/support/docview.wss?uid=swg21995039 (opens in a new tab)x_refsource_CONFIRMx_transferred
- http://www-01.ibm.com/support/docview.wss?uid=swg21991482 (opens in a new tab)x_refsource_CONFIRMx_transferred
- GLSA-201611-02 (opens in a new tab)vendor-advisoryx_refsource_GENTOOx_transferred
- https://community.openvpn.net/openvpn/wiki/SWEET32 (opens in a new tab)x_refsource_CONFIRMx_transferred
- http://www-01.ibm.com/support/docview.wss?uid=nas8N1021697 (opens in a new tab)x_refsource_CONFIRMx_transferred
- 92631 (opens in a new tab)vdb-entryx_refsource_BIDx_transferred
- https://cert-portal.siemens.com/productcert/pdf/ssa-556833.pdf (opens in a new tab)x_refsource_CONFIRMx_transferred
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://cveledger.app/cve/CVE-2016-6329)Record last updated .