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% (89th 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 89th 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

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

89thpercentile

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

References

Patch1

oracle.com

Vendor Advisory2

Third-Party Advisory4

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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.