CVE-2020-15025

MEDIUMEPSS 88th pctl

4.4

CVSS v3

Description

ntpd in ntp 4.2.8 before 4.2.8p15 and 4.3.x before 4.3.101 allows remote attackers to cause a denial of service (memory consumption) by sending packets, because memory is not freed in situations where a CMAC key is used and associated with a CMAC algorithm in the ntp.keys file.

CWE-401Missing Release of Memory (Memory Leak)

How to fix

Remediation Available

ntpUbuntu

Fixed in:1:4.2.8p12+dfsg-3ubuntu4.20.04.1+esm1USN-5175-1

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

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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 ComplexityHigh

Privileges RequiredHigh

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityNone

IntegrityNone

AvailabilityHigh

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

Exploit Intelligence

3.36%probability of exploitation in 30 days

88thpercentile

Elevated risk: more likely to be exploited than 88% of all known CVEs.

References

Patch1

oracle.com

Vendor Advisory2

Third-Party Advisory5

Related Vulnerabilities

Other CWE-401 (Missing Release of Memory (Memory Leak)) vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2020-13934	High	7.5	64%	-	Fix
CVE-2016-6304	High	7.5	63%	-	Fix
CVE-2019-12265	Medium	5.3	60%	-	Fix
CVE-2001-0136	Medium	5.0	45%	-	-
CVE-2016-4232	High	7.5	36%	-	-
CVE-2001-0543	Medium	5.0	19%	-	-

Common questions

How do I fix CVE-2020-15025?

Upgrade ntp on ubuntu 20.04 to 1:4.2.8p12+dfsg-3ubuntu4.20.04.1+esm1 or later.

Is CVE-2020-15025 being actively exploited?

Not that we know of. CVE-2020-15025 is not in the CISA Known Exploited Vulnerabilities catalog. Its EPSS score of 3.4% is the estimated probability that it will be exploited in the next 30 days. That is higher than 88% of all scored CVEs.

How severe is CVE-2020-15025?

CVE-2020-15025 has a CVSS v3 base score of 4.4, rated medium. 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-2020-15025 affect?

Published advisories record a fix for ntp (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.