CVE-2021-37204 describes a denial-of-service vulnerability affecting numerous Siemens SIMATIC controllers and related products, including S7-1200, S7-1500, and ET 200SP Open Controllers. An unauthenticated attacker can exploit this by sending specially crafted packets to port 102/tcp, causing the PLC to crash and requiring a manual restart to restore functionality. This vulnerability carries a CVSSv3.1 score of 7.5 (High) due to its network-based attack vector, low attack complexity, and high impact on availability. While there is no known active exploitation or public exploit code (Metasploit, Nuclei, ExploitDB), the vulnerability has garnered some community discussion and media coverage, indicating awareness within the cybersecurity landscape.
| Vendor | Product | Version(s) | CPE |
|---|---|---|---|
< 2.9.4CPE matchmatch criteria | cpe:2.3:o:siemens:simatic_drive_controller_cpu_1504d_tf_firmware:*:*:*:*:*:*:*:* | ||
< 2.9.4CPE matchmatch criteria | cpe:2.3:o:siemens:simatic_drive_controller_cpu_1507d_tf_firmware:*:*:*:*:*:*:*:* | ||
All Versions ImpactedCPE matchmatch criteria | cpe:2.3:o:siemens:simatic_et_200sp_open_controller_cpu_1515sp_pc2_firmware:*:*:*:*:*:*:*:* | ||
< 4.0CPE matchmatch criteria | cpe:2.3:o:siemens:simatic_s7-plcsim_advanced_firmware:*:*:*:*:*:*:*:* | ||
4.0CPE matchmatch criteria | cpe:2.3:o:siemens:simatic_s7-plcsim_advanced_firmware:4.0:-:*:*:*:*:*:* |
CVSS version used by this source: 3.1
CVSS:3.1/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.