CVE-2016-6329

mediumpriority · track · 26OT risk · elevatedEPSS 0.059 · 93 %ileEURUUS

grimoire priorityP3 · Track

Exploitable?

—

no known exploitation

Likely / severe?

5.94% (93rd) EPSS

CVSS 4.3 · medium

Is it mine?

9 products

Check your exposure

Who says so?

5 sources

cnnvd · enisa_euvd · fstec_bdu · cisa_csaf_ot

EPSS · scored 2026-10-22

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.

remediations

Vendor fix, mitigation, or workaround guidance, as published by each source.

A vendor fix is available.

FixedSIMATIC RF615Rcisa_csaf_ot
Update to V3.2.1 - Download: https://support.industry.siemens.com/cs/ww/en/view/109768501
https://support.industry.siemens.com/cs/ww/en/view/109768501
FixedSIMATIC RF68XRcisa_csaf_ot
Update to V3.2.1 - Download: https://support.industry.siemens.com/cs/ww/en/view/109768501
https://support.industry.siemens.com/cs/ww/en/view/109768501
MitigationSIMATIC RF615Rcisa_csaf_ot
Siemens has identified the following specific workarounds and mitigations thatcustomers can apply to reduce the risk: Restrict network access to the device to the extent possible
MitigationSIMATIC RF68XRcisa_csaf_ot
Siemens has identified the following specific workarounds and mitigations thatcustomers can apply to reduce the risk: Restrict network access to the device to the extent possible

cvss

Technical severity, 0–10. One row per scoring source.

5.9

010

base score 0–10 · higher = more severe · hover a vector to decode

v2.04.3mediumAV:N/AC:M/Au:N/C:P/I:N/A:Nprimary · NVD / NIST USexploitability 8.6 · impact 2.9

v3.05.9mediumCVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:Nprimary · NVD / NIST USexploitability 2.2 · impact 3.6

v3.05.9mediumCVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N/E:P/RL:O/RC:Csecondary · CISA US

v3.05.4mediumCVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N/E:Usecondary · CVSS-BT (t0sche)

v3.15.9mediumAV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:Nsecondary · FSTEC (BDU) RU

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-200USprimaryCWE-310USprimaryCWE-200USCWE-310USCWE-327US

affected products (9)

Products and version ranges known to be affected.

SIMATIC RF615Rall versionscisa_csaf_otUS
SIMATIC RF68XRall versionscisa_csaf_otUS
Siemens SIMATIC RF615R< V3.2.1cisa_csaf_otUS
Siemens SIMATIC RF68XR< V3.2.1cisa_csaf_otUS
n/a n/a≤ n/aenisa_euvdEU
OpenVPN, Inc. OpenVPN≤ 2.3.14fstec_bduRU
Siemens AG SIMATIC RF615R≤ 3.2.1fstec_bduRU
Siemens AG SIMATIC RF68XR≤ V3.2.1fstec_bduRU
openvpn openvpn≤ 2.3.14nvdUScpe:2.3:a:openvpn:openvpn:*:*:*:*:*:*:*:*

advisories (1)

Vendor and ecosystem advisories describing this.

ICSA-19-192-04ICSA-19-192-04 Siemens SIMATIC RF6XXR2019-07-09icsa · cisa_csaf_otUS
CISA recommends users take defensive measures to minimize the exploitation risk of this vulnerability.

also known as (4)

Other names and identifiers for this entity.

sources

Which sources assert this record, and when.

cnnvd enisa_euvd fstec_bdu cisa_csaf_ot nvd NVD CVE.org MITRE

published 2017-01-31modified 2026-06-17

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references (34)

External citations — patches, advisories, analysis.

scry

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