Is CVE-2016-6329 in the CISA KEV catalog?

No. CVE-2016-6329 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2016-6329?

CVE-2016-6329 has a CVSS v3 base score of 5.9 (MEDIUM).

What is the EPSS score for CVE-2016-6329?

CVE-2016-6329 has an EPSS score of 5.94% (92th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2016-6329?

Upgrade openvpn on ubuntu 14.04 to 2.3.2-7ubuntu3.2 or later.

CVE & CISA-KEV Catalog

CVE-2016-6329

MEDIUMEPSS 92th pctl

5.9

CVSS v3

NVD

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.

CWE-200Information Exposure CWE-310Cryptographic Issues

How to fix

Remediation Available

openvpnUbuntu

Fixed in:2.3.2-7ubuntu3.2USN-3339-1

Fixed in:2.3.10-1ubuntu2.1USN-3339-1

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityHigh

Privileges RequiredNone

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityHigh

IntegrityNone

AvailabilityNone

CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N

Exploit Intelligence

5.94%probability of exploitation in 30 days

92ndpercentile

High risk: more likely to be exploited than 92% of all known CVEs.

References

Vendor Advisory1

community.openvpn.net

Third-Party Advisory8

Other references1

cert-portal.siemens.com

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-05-13.