Cox Enterprises is notifying impacted individuals of a data breach that exposed their personal data to hackers who breached the company network after exploiting a zero-day flaw in Oracle E-Business Suite.

The compromise occurred in August, but the company didn’t detect the intrusion until late September, when it launched its internal investigation.

“On September 29, 2025, we became aware of suspicious activity involving Oracle’s E-Business Suite, which is a platform we use for some of our back-office business operations,” reads the notice.

“We learned the suspicious activity was the result of cybercriminals taking advantage of a previously unknown security flaw (called a “zero-day” vulnerability) in Oracle’s E-Business Suite between Aug. 9-14, 2025.”

Cox Enterprises is a major American conglomerate engaged in media (Cox Media Group), telecommunications (Cox Communications), and automotive services (Cox Automotive).

The company has 55,000 employees and an annual revenue of $23 billion, with its businesses having an international reach.

The company has not named the attackers, but the Cl0p ransomware has taken credit for exploiting CVE-2025-61882 as a zero-day vulnerability, long before Oracle released a patch on October 5.

Cl0p hackers are known for leveraging zero-days in popular software products used by a large number of organizations.

Incidents where Cl0p exploited unknown vulnerabilities include the Cleo file transfer in 2024, the MOVEit Transfer and GoAnywhere MFT in 2023, the SolarWinds Serv-U FTP in 2021, and the Accellion FTA in 2020.

Breaches related to Oracle E-Business Suite have been confirmed by multiple companies, among them Logitech, Washington Post, GlobalLogic, Envoy Air, and Harvard University.

The threat actor added Cox Enterprises to their data leak website on the dark web on October 27 and published the stolen information.

Earlier today, Cl0p listed 29 new companies as their victims. The batch includes major organizations in the automotive, software, and technology sectors.

In the notification to 9,479 impacted individuals, Cox provides instructions on how to enroll in identity theft protection and credit monitoring services through IDX at no cost for 12 months.

The company did not specify what types of data were exposed in the notification sample shared with authorities.

Update 11/22/25: Updated the article to remove reference to 2021 API vulnerability that incorrectly stated it was exploited by attackers.