What’s Vulnerable › Vulnerabilities

CVE-2021-42257

• Severity: high (CVSS 7.1 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.4% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2021-10-11 · updated 2026-06-17
• Weakness: CWE-20

Description

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.

Affected products

• Check Smart Project Check Smart: before 6.9.1 — fixed in 6.9.1

How to fix

Upgrade to a fixed version: Check Smart Project Check Smart 6.9.1. Check the vendor advisory for mitigations.

References

• http://www.openwall.com/lists/oss-security/2021/10/14/2
• https://bugzilla.suse.com/show_bug.cgi?id=1183057
• 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-path
• https://www.claudiokuenzler.com/monitoring-plugins/check_smart.php
• http://www.openwall.com/lists/oss-security/2021/10/14/2
• https://bugzilla.suse.com/show_bug.cgi?id=1183057
• 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-path
• https://www.claudiokuenzler.com/monitoring-plugins/check_smart.php

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