Is CVE-2020-16899 in the CISA KEV catalog?

No. CVE-2020-16899 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2020-16899?

CVE-2020-16899 has a CVSS v3 base score of 7.5 (HIGH).

What is the EPSS score for CVE-2020-16899?

CVE-2020-16899 has an EPSS score of 13.35% (96th percentile), estimating the probability of exploitation in the next 30 days.

CVE & CISA-KEV Catalog

CVE-2020-16899

HIGHEPSS 96th pctl

7.5

CVSS v3

NVD

Description

A denial of service vulnerability exists when the Windows TCP/IP stack improperly handles ICMPv6 Router Advertisement packets. An attacker who successfully exploited this vulnerability could cause a target system to stop responding. To exploit this vulnerability, an attacker would have to send specially crafted ICMPv6 Router Advertisement packets to a remote Windows computer. The vulnerability would not allow an attacker to execute code or to elevate user rights directly. The update addresses the vulnerability by correcting how the Windows TCP/IP stack handles ICMPv6 Router Advertisement packets.

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

13.35%probability of exploitation in 30 days

96thpercentile

Very high risk: more likely to be exploited than 96% of all known CVEs.

References

https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2020-16899

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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 2026-02-23.