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Bash impacts As for how serious it is, that depends who you ask. According to a statement from Red Hat, “...some devices may be affected by this flaw, but it won’t be very common.” On the other hand, some security firms are saying that this will impact 30-50% of all servers supporting web pages.
A National Institute of Standards and Technology rated it as a security concern that is a 10 of 10, so they seem to take it seriously. US-CERT does as well, saying Bash is, “... a vulnerability affecting Unix-based operating systems such as Linux and Mac OS X. Exploitation of this vulnerability may allow a remote attacker to execute arbitrary code on an affected system.”
US-CERT also provides links for updates that patch the vulnerability. https://www.us-cert.gov/ncas/current-activity/2014/09/24/Bourne-Again-Shell-Bash-Remote-Code-Execution-Vulnerability