CVE-2020-14303

HIGHEPSS 89th pctl

7.5

CVSS v3

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.

CWE-834

How to fix

Remediation Available

sambaDebian

Fixed in:2:4.12.5+dfsg-1CVE-2020-14303

sambaUbuntu

Fixed in:2:4.3.11+dfsg-0ubuntu0.14.04.20+esm8USN-4454-2

This Ubuntu release reached end-of-life on 2019-04-02.

Fixed in:2:4.3.11+dfsg-0ubuntu0.16.04.29USN-4454-1

This Ubuntu release reached end-of-life on 2021-04-02.

Fixed in:2:4.7.6+dfsg~ubuntu-0ubuntu2.18USN-4454-1

This Ubuntu release reached end-of-life on 2023-05-31. Extended security maintenance is available until 2028-04-01.

Fixed in:2:4.11.6+dfsg-0ubuntu1.4USN-4454-1

This Ubuntu release reached end-of-life on 2025-05-31. Extended security maintenance is available until 2030-04-02.

TridentStack Control can deploy fixes like this automatically across your Windows, macOS, and Linux fleet. See how it works

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredNone

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityNone

IntegrityNone

AvailabilityHigh

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

Exploit Intelligence

3.54%probability of exploitation in 30 days

89thpercentile

Elevated risk: more likely to be exploited than 89% of all known CVEs.

References

Vendor Advisory1

samba.org

Third-Party Advisory8

Other references2

Related Vulnerabilities

Other CWE-834 vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2021-35515	High	7.5	12%	-	Fix
CVE-2021-39924	High	7.5	5.1%	-	Fix
CVE-2023-1993	Medium	6.3	4.1%	-	Fix
CVE-2018-14342	High	7.5	3.7%	-	Fix
CVE-2018-11813	High	7.5	3.2%	-	Fix
CVE-2018-9133	Medium	6.5	3.2%	-	Fix

Common questions

How do I fix CVE-2020-14303?

Published advisories record a fix for 2 affected products. The "How to fix" section on this page lists the fixed version and source advisory for each one, so apply the entry matching what you actually run.

Is CVE-2020-14303 being actively exploited?

Not that we know of. CVE-2020-14303 is not in the CISA Known Exploited Vulnerabilities catalog. Its EPSS score of 3.5% is the estimated probability that it will be exploited in the next 30 days. That is higher than 89% of all scored CVEs.

How severe is CVE-2020-14303?

CVE-2020-14303 has a CVSS v3 base score of 7.5, rated high. CVSS rates the technical impact if the vulnerability is exploited, not how likely that is, so weigh it alongside the exploit-prediction score when you decide what to patch first.

What does CVE-2020-14303 affect?

Published advisories record a fix for samba (Debian), samba (Ubuntu). Only products with a sourced advisory are listed, so treat this as what we can cite rather than a complete inventory.

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-06-17.