Apple Inc. has found no evidence of cyberattackers exploiting newly discovered vulnerabilities in its Mail app for iPhone and iPad, the company has said, referring to software used by hundreds of millions of people worldwide.

The U.S. company is countering assertions by cybersecurity company ZecOps Inc. that software flaws may have allowed hackers to infiltrate iPhones and other iOS devices for more than a year.

After launching an investigation, Apple said in a statement the mail issues were insufficient by themselves to allow cyberattackers to bypass built-in security, adding that it would issue a fix soon.

“We have thoroughly investigated the researcher’s report and, based on the information provided, have concluded these issues do not pose an immediate risk to our users,” the Cupertino, California-based company said. “The researcher identified three issues in Mail, but alone they are insufficient to bypass iPhone and iPad security protections, and we have found no evidence they were used against customers.”

San Francisco-based ZecOps said Wednesday the vulnerability can be exploited when a specially crafted email is opened using the app on an iPhone or an iPad. The flaws may have been used in attacks conducted by “an advanced threat operator,” it said in a report. Among the victims were “individuals from a Fortune 500 organization in North America” and “an executive from a carrier in Japan,” as well as “a journalist in Europe,” ZecOps said.

The vulnerabilities may have been exploited by attackers since January 2018, according to ZecOps.

The bugs were disclosed publicly when Apple issued a beta update, and attackers “will likely use the time until a patch is available to attack as many devices as possible,” ZecOps predicted.

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