What’s Vulnerable › Vulnerabilities

CVE-2021-20316

• Severity: medium (CVSS 6.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.0% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2022-08-23 · updated 2026-06-17
• Weakness: CWE-362

Description

A flaw was found in the way Samba handled file/directory metadata. This flaw allows an authenticated attacker with permissions to read or modify share metadata, to perform this operation outside of the share.

Affected products

• Debian Linux: 10.0, 11.0
• Red Hat Enterprise Linux: 8.0
• RedHat Enterprise Linux Aus: 8.6
• RedHat Enterprise Linux Eus: 8.6
• RedHat Enterprise Linux Tus: 8.6
• RedHat Virtualization Host: 4.0
• Samba: before 4.15.0 — fixed in 4.15.0

How to fix

Upgrade to a fixed version: Samba 4.15.0. Check the vendor advisory for mitigations.

References

• https://access.redhat.com/security/cve/CVE-2021-20316
• https://bugzilla.redhat.com/show_bug.cgi?id=2009673
• https://bugzilla.samba.org/show_bug.cgi?id=14842
• https://security-tracker.debian.org/tracker/CVE-2021-20316
• https://security.gentoo.org/glsa/202309-06
• https://www.samba.org/samba/security/CVE-2021-20316.html
• https://access.redhat.com/security/cve/CVE-2021-20316
• https://bugzilla.redhat.com/show_bug.cgi?id=2009673
• https://bugzilla.samba.org/show_bug.cgi?id=14842
• https://security-tracker.debian.org/tracker/CVE-2021-20316
• https://security.gentoo.org/glsa/202309-06
• https://www.samba.org/samba/security/CVE-2021-20316.html

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