CVE-2026-1626 in LMS1000
Summary
by MITRE • 02/27/2026
An attacker may exploit the use of weak CBC-based cipher suites in the device’s SSH service to potentially observe or manipulate parts of the encrypted SSH communication, if they are able to intercept or interact with the network traffic.
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Analysis
by VulDB Data Team • 03/05/2026
The vulnerability described in CVE-2026-1626 represents a critical weakness in the Secure Shell protocol implementation of a network device, specifically related to the use of outdated cryptographic cipher suites. This flaw exists within the device's SSH service configuration where weak cipher suites based on Cipher Block Chaining (CBC) mode are enabled, creating an exploitable condition that compromises the confidentiality and integrity of encrypted communications. The vulnerability stems from the device's failure to properly enforce secure cryptographic protocols, leaving it susceptible to various forms of cryptographic attacks that target the underlying encryption mechanisms.
The technical implementation of this vulnerability involves the device's SSH service accepting and utilizing cipher suites that employ CBC-based encryption algorithms, which are inherently vulnerable to several well-documented attack vectors including the BEAST and Lucky13 attacks. These attacks exploit weaknesses in the CBC mode of operation where the encryption of each block depends on the previous block's ciphertext, creating patterns that can be analyzed and potentially manipulated by an attacker. The vulnerability specifically targets the encryption layer of SSH communications, which typically operates at the transport layer of the network stack and is designed to provide secure remote access to network devices. When an attacker can intercept network traffic between the device and its clients, they can potentially observe the encrypted communication or manipulate the data being transmitted through carefully crafted attacks against the weak cipher implementations.
The operational impact of this vulnerability extends beyond simple data interception, as it can enable sophisticated attacks that may lead to complete system compromise. An attacker who successfully exploits this weakness could potentially escalate privileges, gain unauthorized access to sensitive network resources, or perform man-in-the-middle attacks that allow them to manipulate network traffic in real-time. The vulnerability is particularly concerning because SSH is commonly used for administrative access to network devices, making it a prime target for attackers seeking to establish persistent access to network infrastructure. The attack vector requires only network interception capabilities, making it accessible to attackers with basic network monitoring tools and knowledge of cryptographic vulnerabilities. This weakness can be exploited in various scenarios including network eavesdropping, traffic manipulation, and potential credential theft that could lead to broader network compromise.
Mitigation strategies for CVE-2026-1626 should focus on immediate cryptographic configuration updates to disable weak CBC-based cipher suites and implement modern, secure encryption protocols. Organizations should update their network device firmware to versions that properly disable vulnerable cipher suites and enforce the use of authenticated encryption modes such as Galois/Counter Mode (GCM) or other AEAD (Authenticated Encryption with Associated Data) algorithms. The implementation should follow industry best practices and standards including those defined by NIST Special Publication 800-57 for cryptographic key management and the CWE-327 weakness classification which specifically addresses the use of weak cryptographic algorithms. Network administrators should also implement proper network segmentation and monitoring to detect potential exploitation attempts, while following ATT&CK framework techniques such as T1021.004 for remote services and T1566 for credential access to ensure comprehensive defense against exploitation. Regular security audits and cryptographic assessments should be conducted to identify and remediate similar vulnerabilities across the network infrastructure, ensuring that all SSH implementations comply with current security standards and best practices.