CVE-2026-8672 in Avantra
Summary
by MITRE • 05/22/2026
Use of default password vulnerability in syslink software AG Avantra on Linux, Windows allows Try Common or Default Usernames and Passwords.
This issue affects Avantra: before 25.3.0.
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Analysis
by VulDB Data Team • 05/22/2026
The vulnerability in syslink software AG Avantra represents a critical authentication weakness that stems from the improper implementation of default credentials within both Linux and Windows environments. This flaw allows unauthorized users to exploit weak default passwords through systematic attempts using common username and password combinations, effectively bypassing legitimate authentication mechanisms. The vulnerability exists in Avantra versions prior to 25.3.0, indicating that the software developers identified and addressed this security gap in their subsequent releases. This type of vulnerability directly maps to CWE-798, which specifically addresses the use of hard-coded credentials in software implementations, and aligns with ATT&CK technique T1110.001 for credential access through default passwords and T1110.003 for credential access through password spraying attacks.
The technical implementation of this vulnerability occurs at the authentication layer where the system fails to enforce strong credential policies during initial setup or configuration phases. Default passwords are typically embedded within the software installation package, often set to common values such as admin/admin, root/root, or user/password combinations. When administrators fail to change these defaults or when the software automatically configures systems with default credentials, attackers can readily exploit this weakness through automated tools or manual brute force attempts. The impact is particularly severe because the default passwords are often documented in various online resources, making them easily accessible to malicious actors. This vulnerability affects both Linux and Windows platforms, indicating a cross-platform implementation flaw where the software developers did not properly address credential management across different operating systems.
The operational consequences of this vulnerability extend beyond simple unauthorized access, as it provides attackers with a foothold for further exploitation within the network infrastructure. Once an attacker successfully authenticates using default credentials, they can potentially escalate privileges, access sensitive data, modify system configurations, or use the compromised system as a pivot point for attacking other network segments. The vulnerability also demonstrates poor security hygiene in software development practices, where security considerations were not adequately integrated into the credential management and authentication design phases. Organizations running affected Avantra versions face significant risk of unauthorized system access, data breaches, and potential compliance violations. The attack surface is particularly broad because default credentials are often left unchanged in production environments, especially in scenarios where systems are deployed by third-party vendors or during rapid deployment cycles.
Mitigation strategies for this vulnerability require immediate action to address the root cause through proper credential management practices. Organizations should implement mandatory credential change policies during software installation, enforce strong password requirements for all administrative accounts, and regularly audit system configurations to identify any remaining default credentials. The recommended solution involves upgrading to Avantra version 25.3.0 or later, which includes enhanced authentication mechanisms and proper credential handling. Additionally, network segmentation and access controls should be implemented to limit the potential impact of credential compromise, while continuous monitoring and logging of authentication attempts can help detect suspicious activities. Security awareness training for system administrators is also crucial to ensure they understand the importance of changing default credentials and implementing proper access controls. The vulnerability underscores the necessity of following security best practices such as those outlined in NIST SP 800-53 and ISO 27001, which emphasize the importance of secure configuration management and credential protection in system design and deployment phases.