reuters.com By A.J. Vicens
October 29, 202511:10 PM GMT+1Updated October 29, 2025

Hackers accessed Ribbon's network in December 2024
Three customers impacted, according to ongoing investigation
Ribbon's breach part of broader trend targeting telecom firms
Oct 29 (Reuters) - Hackers working for an unnamed nation-state breached networks at Ribbon Communications (RBBN.O), opens new tab, a key U.S. telecommunications services company, and remained within the firm’s systems for nearly a year without being detected, a company spokesperson confirmed in a statement on Wednesday.
Ribbon Communications, a Texas-based company that provides technology to facilitate voice and data communications between separate tech platforms and environments, said in its October 23 10-Q filing, opens new tab with the Securities and Exchange Commission that the company learned early last month that people “reportedly associated with a nation-state actor” gained access to the company’s IT network, with initial access dating to early December 2024.

The hack has not been previously reported. It is perhaps the latest example of technology companies that play a critical role in the global telecommunications ecosystem being targeted as part of nation-state hacking campaigns.
Ribbon did not identify the nation-state actor, or disclose which of its customers were affected by the breach, but told Reuters in the statement that its investigation has so far revealed three “smaller customers” impacted.
“While we do not have evidence at this time that would indicate the threat actor gained access to any material information, we continue to work with our third-party experts to confirm this,” a Ribbon spokesperson said in an email. “We have also taken steps to further harden our network to prevent any future incidents.”