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OpenSMTPD has been found vulnerable to yet another critical vulnerability that could allow remote attackers to take complete control over email servers running BSD or Linux operating systems.

OpenSMTPD, also known as OpenBSD SMTP Server, is an open-source implementation of the Simple Mail Transfer Protocol (SMTP) to deliver messages on a local machine or to relay them to other SMTP servers.

It was initially developed as part of the OpenBSD project but now comes pre-installed on many UNIX-based systems.

Discovered by experts at Qualys Research Labs, who also reported a similar RCE flaw in the email server application last month, the latest out-of-bounds read issue, tracked as CVE-2020-8794, resides in a component of the OpenSMTPD’s client-side code that was introduced nearly 5 years ago.

Just like the previous issue, which attackers started exploiting in the wild just a day after its public disclosure, the new OpenSMTPD flaw could also let remote hackers execute arbitrary commands on the vulnerable servers with privileges of either root or any non-root user.

images from Hacker News