CVE-2026-7849 Overview
CVE-2026-7849 is a command injection vulnerability caused by improper neutralization of special elements in a system configuration interface. An unauthenticated remote attacker can inject operating system commands that the affected system subsequently executes with root privileges. The flaw maps to [CWE-77] (Improper Neutralization of Special Elements Used in a Command). CERT-VDE coordinated the disclosure under advisory VDE-2026-008, indicating the issue affects an industrial or operational technology product tracked by the VDE coordination center.
Critical Impact
Unauthenticated network attackers can achieve arbitrary command execution as root, resulting in full compromise of confidentiality, integrity, and availability on the affected device.
Affected Products
Affected product details are published in the CERT-VDE Security Advisory VDE-2026-008. Administrators should consult the advisory to confirm affected models and firmware versions.
Discovery Timeline
- 2026-07-30 - CVE-2026-7849 published to NVD
- 2026-07-30 - Last updated in NVD database
Technical Details for CVE-2026-7849
Vulnerability Analysis
The vulnerability stems from insufficient sanitization of user-supplied input written into the system configuration. When the configuration is loaded or applied, the injected content is interpreted by a command shell running as root. This produces a direct path from unauthenticated network input to privileged command execution.
Because the injection persists in the configuration, the malicious payload can execute whenever the affected configuration processing routine is triggered. This behavior is consistent with the [CWE-77] weakness class, where control characters or shell metacharacters are passed through to a command interpreter without neutralization.
Root Cause
The root cause is missing or incomplete neutralization of shell metacharacters, delimiters, or command separators in a configuration field. The affected component concatenates untrusted input into a command string rather than passing it as a parameterized argument or applying an allow-list validation.
Attack Vector
Exploitation requires only network access to the affected service. No authentication or user interaction is needed. An attacker submits a crafted configuration request containing shell control characters, and the injected command runs under the root account. Refer to the CERT-VDE Security Advisory for protocol-level and endpoint-specific details.
Detection Methods for CVE-2026-7849
Indicators of Compromise
- Unexpected shell metacharacters (;, |, &, backticks, $()) appearing in stored configuration parameters.
- New or unrecognized processes spawned by the configuration service under the root account.
- Outbound network connections initiated by the device to unknown hosts following configuration changes.
- Modifications to system files, cron entries, or startup scripts that do not match administrator activity.
Detection Strategies
- Inspect configuration write requests at the network boundary for command separators and shell syntax.
- Correlate configuration change events with subsequent process execution on the affected device.
- Baseline legitimate configuration values and alert on deviations that contain non-printable or control characters.
Monitoring Recommendations
- Forward device syslog and audit records to a centralized analytics platform for retention and correlation.
- Monitor management-plane interfaces for unauthenticated access attempts and anomalous request volumes.
- Alert on any process running as root that was invoked by the configuration parser or web management daemon.
How to Mitigate CVE-2026-7849
Immediate Actions Required
- Restrict network access to the device management interface to trusted administrative networks only.
- Place affected devices behind a firewall or VPN and block exposure to untrusted networks and the internet.
- Review current device configurations for unexpected entries that may indicate prior exploitation.
- Apply vendor-supplied firmware updates as soon as they are published in the CERT-VDE advisory.
Patch Information
Refer to the CERT-VDE Security Advisory VDE-2026-008 for the authoritative list of fixed firmware versions and remediation guidance from the vendor.
Workarounds
- Segment affected devices onto an isolated management VLAN with strict access control lists.
- Disable remote management interfaces where operationally feasible until a patch is applied.
- Enforce jump-host access for all administrative sessions and log those sessions for review.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
