5 MSP Takeaways from the SonicWall Cloud Backup Breach

When SonicWall urged its customers to reset credentials after a recent cloud backup breach, the security world took notice. Less than 5% of customers were affected, but the incident highlights how even encrypted data in backup files can be leveraged by attackers. For MSPs, this event is more than a headline—it’s a reminder of the constant vigilance needed to safeguard clients.

Here are five key insights MSPs should apply from SonicWall’s disclosure:

1. Backups Are a Double-Edged Sword

Backups are essential for business continuity, but they can also create additional attack surfaces. In this breach, firewall preference files stored in the cloud were exposed. MSPs must regularly review where client backups are stored, how they’re protected, and whether access controls are sufficient. Encryption is vital, but storage practices and monitoring are equally critical.

2. Password Hygiene Must Be Proactive

SonicWall’s immediate call for password resets underscores how attackers can exploit even partial information. MSPs should implement strong password policies across client environments, including rotation schedules, complexity requirements, and monitoring for credential reuse. Introducing passwordless or hardware-based authentication options can also reduce reliance on static credentials.

3. VPN and Remote Access Require Strict Controls

The incident revealed that disabling unnecessary access points—such as WAN access, SSL VPN, or IPSec VPN—can limit exposure. MSPs should audit remote access services regularly, ensuring only essential connections remain open. Multi-factor authentication (MFA) should be mandatory, with recovery codes treated with the same sensitivity as passwords.

4. Vendor Vulnerabilities Impact MSP Trust

Even trusted vendors like SonicWall are not immune to breaches. For MSPs, this reinforces the need for layered defenses and vendor risk assessments. Establishing incident response playbooks that anticipate vendor-related compromises ensures clients are protected when external partners falter.

 

5. Communication Builds Client Confidence

SonicWall moved quickly to provide updated preference files with randomized credentials and VPN keys. MSPs should follow this example by keeping clients informed in plain language whenever security events occur. Clear, timely communication not only limits damage but also strengthens trust between providers and their customers.

 

The SonicWall cloud backup breach is a cautionary tale for MSPs: even when impact seems limited, the lessons are far-reaching. By tightening backup practices, enforcing strong authentication, reducing unnecessary remote access, assessing vendor risk, and communicating effectively, MSPs can turn this breach into a blueprint for stronger client security.