CVE-2018-4838 describes an unauthenticated firmware upgrade/downgrade vulnerability in the web interface (TCP/80) of various Siemens EN100 Ethernet module variants (IEC 61850, DNP3, IEC 104, Modbus TCP). This flaw allows an attacker to install arbitrary firmware, including older, vulnerable versions, without authentication. With a CVSS score of 7.5 (High), the vulnerability is network-exploitable with low attack complexity, potentially leading to high integrity impact by allowing unauthorized modification of the device's operating system. There is no evidence of active exploitation, public exploit code (Metasploit, Nuclei, ExploitDB), or KEV listing, though it has received some community discussion and media coverage.
| Vendor | Product | Version(s) | CPE |
|---|---|---|---|
Range not provided by sourceCPE matchmatch criteria | cpe:2.3:o:siemens:en100_ethernet_module_iec_104_firmware:-:*:*:*:*:*:*:* | ||
Range not provided by sourceCPE matchmatch criteria | cpe:2.3:o:siemens:en100_ethernet_module_dnp3_firmware:-:*:*:*:*:*:*:* | ||
Range not provided by sourceCPE matchmatch criteria | cpe:2.3:o:siemens:en100_ethernet_module_modbus_tcp_firmware:-:*:*:*:*:*:*:* | ||
Range not provided by sourceCPE matchmatch criteria | cpe:2.3:o:siemens:en100_ethernet_module_profinet_io_firmware:-:*:*:*:*:*:*:* | ||
< 4.30CPE matchmatch criteria | cpe:2.3:o:siemens:en100_ethernet_module_iec_61850_firmware:*:*:*:*:*:*:*:* |
CVSS version used by this source: 3.0
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
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.