CVE-2021-42257

check_smart before 6.9.1 allows unintended drive access by an unprivileged user because it only checks for a substring match of a device path (the /dev/bus substring and a number), aka an unanchored regular expression.

• CWE-20

• http://www.openwall.com/lists/oss-security/2021/10/14/2Exploit, Third Party Advisory
• https://bugzilla.suse.com/show_bug.cgi?id=1183057Exploit, Issue Tracking, Patch, Third Party Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2021-42257
• https://www.claudiokuenzler.com/blog/1068/check_smart-6.9.1-security-fix-release-pseudo-device-pathThird Party Advisory
• https://www.claudiokuenzler.com/monitoring-plugins/check_smart.phpThird Party Advisory
• http://www.openwall.com/lists/oss-security/2021/10/14/2Exploit, Third Party Advisory
• https://bugzilla.suse.com/show_bug.cgi?id=1183057Exploit, Issue Tracking, Patch, Third Party Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2021-42257
• https://www.claudiokuenzler.com/blog/1068/check_smart-6.9.1-security-fix-release-pseudo-device-pathThird Party Advisory
• https://www.claudiokuenzler.com/monitoring-plugins/check_smart.phpThird Party Advisory

Published

Oct 11, 2021

Last Modified

Jun 17, 2026

Status

Modified

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
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