CVE-2016-3949 json
Siemens SIMATIC S7-300 Profinet-enabled CPU devices with firmware before 3.2.12 and SIMATIC S7-300 Profinet-disabled CPU devices with firmw…
published 2016-06-27 10 y ago modified 2026-06-17 4 mo ago also EUVD-2016-4961
- cvss
- 7.5
- version 3.0, NVD
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 4.5%
- EPSS 4.5% chance of exploitation in 30 days, percentile 91%
- public exploits
- 0
- none known
Summary
Siemens SIMATIC S7-300 Profinet-enabled CPU devices with firmware before 3.2.12 and SIMATIC S7-300 Profinet-disabled CPU devices with firmware before 3.3.12 allow remote attackers to cause a denial of service (defect-mode transition) via crafted (1) ISO-TSAP or (2) Profibus packets.
Vendor advisories
What the vendors themselves say about their products: affected, fixed or not affected, and what to do.
cisa ICSA-16-161-01 updated cvss 7.5
Siemens SIMATIC S7-300 Denial-of-Service Vulnerability
-
Siemens SIMATIC S7-300 CPUs with Profinet support <=3.2.12 Siemens SIMATIC S7-300 CPUs without Profinet support <=3.3.12affected: mitigation “For more information on this vulnerability and detailed instructions, please see Siemens Security Advisory SSA-818183 at the following location: (http://www.siemens.com/cert/advisories)”
From CISA ICS and IT advisories (CSAF, https://github.com/cisagov/CSAF), a U.S. Government work; changed: reduced to products, statuses and remediations. CISA notification · csaf
Exploit prediction
4.49% chance of exploitation in the next 30 days, higher than 91% of all scored CVEs (FIRST EPSS, 2026-11-09).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| NVD | 3.0 | 7.5 | CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |
| NVD | 2.0 | 7.8 | AV:N/AC:L/Au:N/C:N/I:N/A:C |
Classification
- Weakness
-
- CWE-399 Resource Management Errors
References
-
siemens.com
/cert/pool/cert/siemens_security_advisory_ssa-818183.pdf
vendor-advisory
-
securitytracker.com
/id/1036089
vdb-entry, third-party-advisory
-
ics-cert.us-cert.gov
/advisories/ICSA-16-161-01
mitigation, third-party-advisory, us-government-resource
- cert-portal.siemens.com /productcert/pdf/ssa-818183.pdf
Sources
- CVE List CVE-2016-3949
- NVD CVE-2016-3949
Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.