Is CVE-2020-28466 in the CISA KEV catalog?

No. CVE-2020-28466 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2020-28466?

CVE-2020-28466 has a CVSS v3 base score of 7.5 (HIGH).

What is the EPSS score for CVE-2020-28466?

CVE-2020-28466 has an EPSS score of 3.66% (88th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2020-28466?

Upgrade nats-server to 2.2.0 or later. Fixes are available for 2 affected products.

CVE & CISA-KEV Catalog

CVE-2020-28466

HIGHEPSS 88th pctl

7.5

CVSS v3

NVD

Description

This affects all versions of package github.com/nats-io/nats-server/server. Untrusted accounts are able to crash the server using configs that represent a service export/import cycles. Disclaimer from the maintainers: Running a NATS service which is exposed to untrusted users presents a heightened risk. Any remote execution flaw or equivalent seriousness, or denial-of-service by unauthenticated users, will lead to prompt releases by the NATS maintainers. Fixes for denial of service issues with no threat of remote execution, when limited to account holders, are likely to just be committed to the main development branch with no special attention. Those who are running such services are encouraged to build regularly from git.

How to fix

Remediation Available

nats-serverNVD

Affected:>= 2.0.0, < 2.2.0Fixed in:2.2.0CVE-2020-28466derived from NVD

nats serverNVD

Affected:>= 2.0.0, < 2.2.0Fixed in:2.2.0CVE-2020-28466derived from NVD

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

3.66%probability of exploitation in 30 days

88thpercentile

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

References

Patch1

github.com

Third-Party Advisory2

Mailing List1

openwall.com

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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 2026-03-30.