CVE-2026-5416 Overview
CVE-2026-5416 is a command injection vulnerability affecting a Managed Ethernet Switch. The flaw stems from improper neutralization of special elements in a name parameter [CWE-78]. A low-privileged remote attacker can inject operating system commands through the vulnerable input, resulting in full compromise of the device. The vulnerability is exposed over the network and requires no user interaction.
CERT VDE published advisory VDE-2026-038 covering the issue. The vulnerability carries a CVSS 4.0 base score of 8.7 and impacts confidentiality, integrity, and availability of the affected switch.
Critical Impact
Authenticated remote attackers with low privileges can execute arbitrary operating system commands on the Managed Ethernet Switch, achieving full system compromise.
Affected Products
- Managed Ethernet Switch (vendor identified through CERT VDE advisory VDE-2026-038)
- See the CERT VDE Advisory VDE-2026-038 for exact product and firmware versions
Discovery Timeline
- 2026-06-16 - CVE-2026-5416 published to NVD
- 2026-06-17 - Last updated in NVD database
Technical Details for CVE-2026-5416
Vulnerability Analysis
The vulnerability is an OS command injection issue classified under [CWE-78]. The switch accepts user-supplied data in a name parameter and forwards that input into a system command without sanitizing shell metacharacters. An attacker who supplies crafted input can break out of the intended argument context and append arbitrary commands. The injected commands execute in the context of the underlying management process on the switch.
Because the affected interface is reachable over the network and only requires low-privileged authentication, an attacker who obtains or is issued any operator-level credential can reach the vulnerable code path. Successful exploitation grants execution of arbitrary commands on the embedded operating system, which on managed switches typically runs with elevated privileges.
Root Cause
The root cause is the absence of input validation and neutralization on the name parameter before it is passed to a command interpreter. Special shell characters such as ;, |, &, backticks, and $() are not filtered or escaped, allowing arbitrary command chaining.
Attack Vector
An authenticated attacker sends a request to the switch management interface containing crafted shell metacharacters in the name field. The management process concatenates the value into a shell command, and the operating system executes the attacker-controlled payload. From this foothold, an attacker can modify switch configuration, pivot into adjacent network segments, intercept traffic, or persist on the device firmware. No verified public exploit code is available at the time of writing.
Detection Methods for CVE-2026-5416
Indicators of Compromise
- Unexpected outbound connections originating from the management interface of the switch.
- Configuration changes, new local accounts, or modified firmware images on the affected switch.
- Authentication events from low-privileged accounts followed by atypical management API calls.
- Log entries showing shell metacharacters (;, |, &, `, $() in name parameter values.
Detection Strategies
- Inspect HTTP and API request logs from the switch management plane for suspicious characters in name fields.
- Correlate low-privileged session activity with subsequent privileged configuration changes.
- Monitor SNMP, syslog, and NetFlow telemetry from the switch for anomalous behavior such as unexpected process activity or new listening services.
Monitoring Recommendations
- Forward switch syslog and authentication logs to a central SIEM and alert on command injection payload patterns.
- Baseline normal management traffic and alert on deviations such as new source IPs accessing the management interface.
- Track firmware integrity and configuration revisions to identify unauthorized changes promptly.
How to Mitigate CVE-2026-5416
Immediate Actions Required
- Apply the firmware update referenced in CERT VDE Advisory VDE-2026-038 as soon as it is available for your model.
- Restrict access to the switch management interface to a dedicated, isolated management VLAN or jump host.
- Rotate all switch credentials and remove any unused low-privileged accounts.
- Audit existing switch configurations and logs for signs of prior exploitation.
Patch Information
Refer to CERT VDE Advisory VDE-2026-038 for the authoritative list of fixed firmware versions and download links. Apply the vendor-supplied firmware to all affected switches and verify the upgrade with a configuration audit afterward.
Workarounds
- Block network access to the management interface from untrusted networks using access control lists or firewall rules.
- Require certificate-based or multi-factor authentication on management access where supported.
- Disable remote management protocols that are not required for operations.
- Place affected switches behind a bastion host until firmware can be updated.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
