CVE-2026-14837 in c430
Summary
by MITRE • 07/27/2026
Multiple Lenze products are affected by an improper signature verification vulnerability in the SSH enablement mechanism. A low-privileged local attacker can bypass verification of the SSH enable file signature and enable SSH access on the device. Successful exploitation may result in unauthorized administrative access and complete system compromise.
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Analysis
by VulDB Data Team • 07/27/2026
This vulnerability resides within the security architecture of multiple Lenze industrial control products where the Secure Shell protocol implementation contains a critical flaw in its signature verification mechanism. The weakness exists in how the system validates cryptographic signatures associated with SSH enablement files, creating an exploitable path that allows attackers to bypass authentication checks. According to the CWE taxonomy, this represents a weakness classified under CWE-347 - Improper Verification of Cryptographic Signature, which directly addresses the failure to properly validate digital signatures that should authenticate the legitimacy of system components.
The technical exploitation occurs through a local attack vector where an attacker with low-privileged user access can manipulate or replace SSH enablement files without proper signature validation. This flaw essentially allows the attacker to generate or modify signed files that would normally require legitimate cryptographic verification before enabling SSH services on the device. The vulnerability stems from inadequate implementation of digital signature verification routines within the device's firmware or software stack, where the system fails to properly authenticate the source and integrity of SSH enablement files.
From an operational perspective, this vulnerability presents a severe risk to industrial control systems as it provides a pathway for attackers to gain unauthorized administrative access to critical infrastructure devices. The ability to enable SSH access without proper authentication creates a backdoor that could be leveraged for persistent access, data exfiltration, or system disruption. Organizations relying on Lenze products face potential compromise of their operational technology environments where the vulnerability could be exploited to escalate privileges and establish footholds within industrial networks. This type of attack aligns with ATT&CK technique T1078 - Valid Accounts, as it enables unauthorized access through legitimate authentication mechanisms that have been bypassed.
The impact extends beyond immediate system compromise as this vulnerability can facilitate lateral movement within industrial networks where multiple devices may be running affected Lenze products. Security professionals should consider this weakness in their risk assessments for industrial control systems and evaluate the potential for cascading effects when similar vulnerabilities exist across networked devices. The lack of proper signature verification creates an environment where malicious actors can manipulate system components without detection, undermining the integrity and security posture of industrial environments that depend on these control systems.
Organizations should implement immediate mitigations including firmware updates from Lenze to address the signature verification flaw, along with network segmentation to limit local access to critical devices. Additional controls such as monitoring for unauthorized SSH enablement file modifications and implementing strict access controls for system configuration changes can help detect and prevent exploitation attempts. The vulnerability highlights the importance of proper cryptographic implementation in industrial security systems where the failure to validate digital signatures can lead to complete system compromise, emphasizing the need for robust security practices aligned with NIST SP 800-53 security controls for industrial control systems.