CVE-2016-3949
No exploitation reported by the sources we read.
- Published2016-06-27
- WeaknessCWE-399
Am I affected?
Debian, Ubuntu or Red Hat sometimes backport a fix without changing the upstream version number: such a version reads « to verify », never « affected ».With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.
Description
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.
Timeline
dates in UTC- 2016-06-2710:59CVE publishedNVD
Observed activity
isMalicious corpus · updated 2026-10-23 21:37 UTCBlock these indicators
- Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2016-3949?format=txt
- CSV export: https://api.ismalicious.com/edl/cve/CVE-2016-3949?format=csv
- TAXII collection of exploited CVEs
- The EDL and CSV take an API key on the Pro plan.
Versions per branch
NVD| Branch | Affected | Fixed in | Source |
|---|---|---|---|
| 3.2 | = 3.2.11 | no fix published | NVD |
| Branch | Affected | Fixed in | Source |
|---|---|---|---|
| 3.3 | = 3.3.11 | no fix published | NVD |
as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.
Distribution builds and vendor advisories
Packages from OSV.dev and products from the vendors' CSAF advisories.
version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.
Vendor advisories
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: <=3.3.12
Fix
- Mitigation from the vendor CISA ICSA-16-161-01 · 2 productsSiemens has released SIMATIC S7-300 firmware Versions V3.2.12 and V3.3.12, which fix the vulnerability, and recommends users update to the latest version. Users can find this firmware at the following location: https://support.industry.siemens.com/cs/ww/en/ps/13752)
- Mitigation from the vendor CISA ICSA-16-161-01 · 2 productsFor 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)
Advisories and patches
- www.siemens.comVendor Advisory
- ics-cert.us-cert.govMitigation
Detection
- Nuclei template
- none so far ProjectDiscovery
- Exploit-DB
- no entry Exploit-DB
- Proof-of-concept repositories
- none listed PoC-in-GitHub
Sources
- NVDCVSS 3.07.5read 2026-10-23
- NVDCVSS 2.07.8read 2026-10-23
- NVDweakness (CWE)CWE-399read 2026-10-23
- FIRST EPSSEPSS score4.5 %2026-10-23
Technical details
- CVSS v3 Vector
- CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- Published
- 2016-06-27
- Last Modified
- 2026-06-17
- NVD status
- Modified
Frequently asked questions
What is CVE-2016-3949?
Is CVE-2016-3949 actively exploited?
What is the CVSS score for CVE-2016-3949?
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