Is CVE-2020-13817 in the CISA KEV catalog?

No. CVE-2020-13817 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2020-13817?

CVE-2020-13817 has a CVSS v3 base score of 7.4 (HIGH).

What is the EPSS score for CVE-2020-13817?

CVE-2020-13817 has an EPSS score of 4.07% (90th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2020-13817?

Upgrade ntp on debian 11 to 1:4.2.8p14+dfsg-1 or later.

CVE & CISA-KEV Catalog

CVE-2020-13817

HIGHEPSS 90th pctl

7.4

CVSS v3

NVD

Description

ntpd in ntp before 4.2.8p14 and 4.3.x before 4.3.100 allows remote attackers to cause a denial of service (daemon exit or system time change) by predicting transmit timestamps for use in spoofed packets. The victim must be relying on unauthenticated IPv4 time sources. There must be an off-path attacker who can query time from the victim's ntpd instance.

CWE-330

How to fix

Remediation Available

ntpDebian

Fixed in:1:4.2.8p14+dfsg-1CVE-2020-13817

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 ComplexityHigh

Privileges RequiredNone

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityNone

IntegrityHigh

AvailabilityHigh

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

Exploit Intelligence

4.07%probability of exploitation in 30 days

90thpercentile

Elevated risk: more likely to be exploited than 90% of all known CVEs.

References

Patch1

oracle.com

Vendor Advisory2

Third-Party Advisory4

Related Vulnerabilities

Other CWE-330 vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2019-5420	Critical	9.8	92%	-	Fix
CVE-2021-34646	Critical	9.8	51%	-	-
CVE-2008-0087	High	7.5	32%	-	-
CVE-2017-6026	Critical	9.1	32%	-	-
CVE-2018-17888	Critical	9.8	30%	-	-
CVE-2020-11901	Critical	9.0	21%	-	Fix

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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 2025-05-05.