The US National Security Agency (NSA) has issued a cybersecurity advisory warning that the Russian military hacking group responsible for interfering in the 2016 presidential election has been exploiting a critical vulnerability in Exim since last August or earlier.

For those unfamiliar with Exim, the software is a mail transfer agent (MTA) that runs in the background of email servers. The software is currently the most popular MTA and a big reason for this is due to the fact that it is bundled with many popular Linux distros including Debian and Red Hat.

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