CVE-2016-3949 describes a denial-of-service vulnerability affecting Siemens SIMATIC S7-300 CPU devices, specifically those with Profinet enabled (firmware before 3.2.12) or disabled (firmware before 3.3.12). An unauthenticated remote attacker can exploit this by sending crafted ISO-TSAP or Profibus packets, causing the device to transition into a defect mode. This vulnerability carries a CVSSv3 score of 7.5 (High), indicating a network-based attack with low complexity, requiring no user interaction, and resulting in high availability impact. While there is no evidence of active exploitation, public exploit code, or KEV listing, the vulnerability has garnered some community discussion and media coverage.
| Vendor | Product | Version(s) | CPE |
|---|---|---|---|
3.2.11CPE matchmatch criteria | cpe:2.3:o:siemens:simatic_s7-300_with_profitnet_support_firmware:3.2.11:*:*:*:*:*:*:* | ||
3.3.11CPE matchmatch criteria | cpe:2.3:o:siemens:simatic_s7-300_without_profitnet_support_firmware:3.3.11:*:*:*:*:*:*:* |
CVSS version used by this source: 3.0
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.1 Mastodon, and 0.4 GitHub mentions.
The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.
Remediation records are not available for this CVE.