A popular open-source program for encrypted communications has a serious flaw that could let Internet attackers slip into servers running the software, according to its creators and a security firm.

A vulnerability affects all versions of the OpenSSH client released in the past two decades, ever since the application was released in 1999.

OpenSSH are network-level security utilities used to encrypt traffic over SSH remote logins. Xauth is a mechanism that handles remote and VPN authentication.

OpenSSH continues to be vulnerable to oracle attacks, and the issue affects all versions of the suite since September 2011. Developers fixed a similar bug less than a week ago.

A claim of a software vulnerability in a program used to connect securely to servers across the Internet is likely a hoax, according to SANS.

Since 2010, a roaming feature in OpenSSH could have let attackers glean client information, Qualys reported today.

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Security firm Qualys first reported the roaming vulnerability to the OpenSSH project and has identified the flaw as CVE-2016-0777.

OpenSSH security hole unearthed A vulnerability was discovered in versions of OpenSSH, open-source variants of the Unix OS, which companies are being warned could expose them to a hacker attack.