Security experts said the vulnerable code is also found in some widely used email server software, the online browser anonymizing tool Tor and OpenVPN, as well as some online games and software that runs Internet-connected devices such as webcams and mobile phones.
Jeff Forristal, chief technology officer of Bluebox Security, said that version 4.1.1 of Google's Android operating system, known as Jelly Bean, is also vulnerable. Google officials declined comment on his finding.
Other security experts said that they would avoid using any device with the vulnerable software in it, but that it would take a lot of effort for a hacker to extract useful data from a vulnerable Android phone. (Editing by Edwin Chan and Eric Walsh)