Cliff Viessman, Inc. Data Breach Affects Thousands

On Aug. 5, 2025, Cliff Viessman, Inc., also known as Viessman Trucking, detected suspicious activity within its internal network. An investigation revealed that an unauthorized actor gained access to certain CVI systems and copied files. A review took place and on Aug. 12, 2025, it was determined that the compromised files contained personally identifiable information (PII) belonging to 3,637 individuals.

Exposed information included names, Social Security numbers and driver's license numbers. Viessman Trucking began notifying affected individuals on Sept. 10, 2025. The data breach was also disclosed to the Vermont, Montana, Massachusetts and New Hampshire Attorney Generals' offices between Sept. 10 and Sept. 11, 2025.

Viessman Trucking's response

Cliff Viessman, Inc. responded to the breach securing its systems and implementing additional technical safeguards and enhanced security measures to reduce the risk of future incidents. The company is offering 12 free months of TransUnion Cyberscout single-bureau credit monitoring services to all affected individuals.

If you receive a notice from Cliff Viessman, Inc. about this breach, you may want to:

• Sign up for the free credit monitoring services, offered by the company.
• Monitor your credit reports and financial accounts for any unusual activity.
• Be alert for phishing emails or phone calls that may use your exposed information.
• Consider placing a fraud alert or credit freeze with major credit bureaus.

For further assistance, individuals can contact the dedicated assistance line at 1-833-426-7740, Monday through Friday from 8 a.m. to 8 p.m. Eastern time.

More information about the trucking company can be found on the Viessman Trucking website.