What is Relay attack?

Relay attack is a cyberattack in which attackers intercept and relay communications between two trusted parties to gain unauthorized access. It exploits legitimate authentication exchanges, allowing attackers to impersonate users or devices without directly stealing credentials.

Many authentication systems rely on trust between users, devices, and services. Attackers can abuse this trust by positioning themselves between communicating parties and forwarding authentication messages in real time.

A relay attack is a type of man-in-the-middle (MitM) attack where an attacker captures and forwards communications between a victim and a legitimate system. Because the authentication process appears valid to both parties, attackers may gain unauthorized access without needing to know passwords or cryptographic keys.

How does a Relay Attack work?

Relay attacks exploit authentication protocols that do not adequately verify the proximity or authenticity of communicating parties. The attacker acts as an intermediary, forwarding messages between the victim and the target system.

A typical relay attack involves the following steps:

1. The attacker positions themselves between the victim and the target.
2. Authentication messages are intercepted.
3. The attacker forwards the messages in real time.
4. The target system validates the relayed authentication request.
5. Unauthorized access is granted to the attacker.

Common types of Relay Attacks

Relay attacks can target various authentication technologies and communication protocols. The attack method often depends on the underlying technology being exploited.

Common examples include:

• NTLM relay attacks.
• RFID relay attacks.
• NFC relay attacks.
• Bluetooth relay attacks.
• Keyless vehicle entry relay attacks.

As organizations adopt contactless authentication and wireless technologies, defending against relay attacks becomes increasingly important.

Risks associated with Relay Attacks

Successful relay attacks can bypass authentication mechanisms and provide attackers with unauthorized access to sensitive systems and resources.

Potential consequences include:

• Unauthorized account access.
• Data theft and exposure.
• Privilege escalation.
• Financial fraud.
• Compromise of enterprise resources.
• Operational disruption.

Organizations should implement layered security controls to reduce the likelihood and impact of relay-based attacks.

How Hexnode UEM supports stronger access security

Relay attacks often target authentication workflows and trusted devices. While preventing protocol-level relay attacks requires security controls within identity and authentication systems, organizations can reduce risk by ensuring endpoints remain secure and compliant.

Hexnode UEM helps IT administrators manage and secure devices through centralized policy enforcement and device management. By maintaining device visibility and enforcing security requirements, organizations can strengthen the overall security of their access environment.

Key capabilities include:

• Device compliance management: Enforce organizational security requirements across managed devices.
• Security policy enforcement: Configure password policies, encryption settings, and device restrictions.
• Identity platform integrations: Integrate with enterprise identity solutions such as Microsoft Entra ID and Google Workspace.
• Application management: Deploy and manage corporate applications securely.
• Remote device management: Monitor and manage endpoints from a centralized console.

While Hexnode UEM does not prevent relay attacks directly, it helps organizations maintain secure and compliant endpoints that support broader identity and access security strategies.