- Marquis confirms August 2025 breach affected more than 670,000 people
- SonicWall MySonicWall Brute Force Incident Attack Exposing Firewall Configurations
- Marquis sues SonicWall, which disputes the connection between the two events
The August 2025 cyberattack on Marquis affected more than 670,000 people, the company confirmed earlier this week.
Marquis is an American financial technology company that creates software for banks and credit unions, and to defend its internal network it uses a firewall built by SonicWall.
In mid-September 2025, SonicWall warned its firewall customers to reset their passwords after anonymous threat actors forced their way into the company’s MySonicWall cloud service.
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Lawsuit filed
This tool allows SonicWall Firewall users to back up their firewall configuration files, including network rules and access policies, VPN configurations, service credentials (LDAP, RADIUS, SNMP), or administrator usernames and passwords (if stored in the configuration).
SonicWall later confirmed that all of its customers were affected, and Marquis said he was one of them.
Initially, no reports were released on the number of people affected. Marquis filed reports with several attorney general’s offices indicating that different types of information had been stolen in different states. “Potentially implicated personal information for Maine residents includes names, addresses, telephone numbers, Social Security numbers, tax identification numbers, financial account information without security or access codes, and dates of birth,” he said in his Maine filing.
NOW, BeepComputer claims the company has confirmed more than 670,000 victims.
“The incident was limited to Marquis systems and did not affect our customers’ systems,” the company told those affected, according to the publication. “Our client reviewed the affected files on December 10, 2025, then worked to validate and identify individuals whose information may have been affected by the incident, and our client worked as quickly as possible to obtain the individuals’ most recent mailing address information.”
Meanwhile, Marquis filed a lawsuit against SonicWall, claiming the attack was a result of the company’s behavior. SonicWall, on the other hand, claims that there is no evidence of the connection between the two incidents.
Via BeepComputer
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