What’s Vulnerable › Vulnerabilities

CVE-2020-14383

• Severity: medium (CVSS 6.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 2.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2020-12-02 · updated 2026-06-17
• Weakness: CWE-391

Description

A flaw was found in samba's DNS server. An authenticated user could use this flaw to the RPC server to crash. This RPC server, which also serves protocols other than dnsserver, will be restarted after a short delay, but it is easy for an authenticated non administrative attacker to crash it again as soon as it returns. The Samba DNS server itself will continue to operate, but many RPC services will not.

Affected products

• Red Hat Enterprise Linux: 8.0
• Samba: from 4.0.0 before 4.11.15; from 4.12.0 before 4.12.9; from 4.13.0 before 4.13.1 — fixed in 4.11.15, 4.12.9, 4.13.1

How to fix

Upgrade to a fixed version: Samba 4.11.15, 4.12.9, 4.13.1. Check the vendor advisory for mitigations.

References

• https://bugzilla.redhat.com/show_bug.cgi?id=1892636
• https://lists.debian.org/debian-lts-announce/2024/04/msg00015.html
• https://security.gentoo.org/glsa/202012-24
• https://www.samba.org/samba/security/CVE-2020-14383.html
• https://bugzilla.redhat.com/show_bug.cgi?id=1892636
• https://lists.debian.org/debian-lts-announce/2024/04/msg00015.html
• https://security.gentoo.org/glsa/202012-24
• https://www.samba.org/samba/security/CVE-2020-14383.html

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