CVE-2020-14303

Name: CVE-2020-14303
Creator: NVD / NIST
Published: 2020-07-06T18:15:20.323+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.5/10EPSS 3.54%

Last modified Jun 17, 2026

CVE-2020-14303 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. A flaw was found in the AD DC NBT server in all Samba versions before 4.10.17, before 4.11.11 and before 4.12.4. A samba user could send an empty UDP packet to cause the samba server to crash.. EPSS estimates a 3.54% chance of exploitation in the next 30 days.

Description

A flaw was found in the AD DC NBT server in all Samba versions before 4.10.17, before 4.11.11 and before 4.12.4. A samba user could send an empty UDP packet to cause the samba server to crash.

Metrics

CVSS 3.1

7.5/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

EPSS Probability

3.54%

87.8th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-834

Affected Software

Vendor	Product	Versions
Samba	Samba	>= 4.10.0, < 4.10.17
Samba	Samba	>= 4.11.0, < 4.11.11
Samba	Samba	>= 4.12.0, < 4.12.4
Fedoraproject	Fedora	31
Opensuse	Leap	15.1
Opensuse	Leap	15.2
Debian	Debian Linux	9.0
Canonical	Ubuntu Linux	12.04
Canonical	Ubuntu Linux	14.04
Canonical	Ubuntu Linux	16.04
Canonical	Ubuntu Linux	18.04
Canonical	Ubuntu Linux	20.04

References

http://lists.opensuse.org/opensuse-security-announce/2020-07/msg00030.htmlMailing List, Third Party Advisory
http://lists.opensuse.org/opensuse-security-announce/2020-07/msg00054.htmlMailing List, Third Party Advisory
http://lists.opensuse.org/opensuse-security-announce/2020-09/msg00002.htmlMailing List, Third Party Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=1851298%3B
https://lists.debian.org/debian-lts-announce/2020/11/msg00041.htmlMailing List, Third Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/6YLNQ5GRXUKYRUAOFZ4DUBVN4SMTL6Q2/
https://security.gentoo.org/glsa/202007-15Third Party Advisory
https://security.netapp.com/advisory/ntap-20200709-0003/Third Party Advisory
https://usn.ubuntu.com/4454-1/Third Party Advisory
https://usn.ubuntu.com/4454-2/Third Party Advisory
https://www.samba.org/samba/security/CVE-2020-14303.htmlVendor Advisory
http://lists.opensuse.org/opensuse-security-announce/2020-07/msg00030.htmlMailing List, Third Party Advisory
http://lists.opensuse.org/opensuse-security-announce/2020-07/msg00054.htmlMailing List, Third Party Advisory
http://lists.opensuse.org/opensuse-security-announce/2020-09/msg00002.htmlMailing List, Third Party Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=1851298%3B
https://lists.debian.org/debian-lts-announce/2020/11/msg00041.htmlMailing List, Third Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/6YLNQ5GRXUKYRUAOFZ4DUBVN4SMTL6Q2/
https://security.gentoo.org/glsa/202007-15Third Party Advisory
https://security.netapp.com/advisory/ntap-20200709-0003/Third Party Advisory
https://usn.ubuntu.com/4454-1/Third Party Advisory
https://usn.ubuntu.com/4454-2/Third Party Advisory
https://www.samba.org/samba/security/CVE-2020-14303.htmlVendor Advisory

Timeline

Published: Jul 6, 2020
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2020-14303?

A flaw was found in the AD DC NBT server in all Samba versions before 4.10.17, before 4.11.11 and before 4.12.4. A samba user could send an empty UDP packet to cause the samba server to crash.

How severe is CVE-2020-14303?

CVE-2020-14303 has a CVSS score of 7.5/10 (HIGH severity). The EPSS model estimates a 3.54% probability of exploitation in the next 30 days.

How do I fix CVE-2020-14303?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2020-14303?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST