Is CVE-2021-20077 in the CISA KEV catalog?

No. CVE-2021-20077 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2021-20077?

CVE-2021-20077 has a CVSS v3 base score of 6.7 (MEDIUM).

What is the EPSS score for CVE-2021-20077?

CVE-2021-20077 has an EPSS score of 0.35% (27th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2021-20077?

Upgrade Nessus Agent to 8.2.3 or later.

CVE & CISA-KEV Catalog

CVE-2021-20077

MEDIUM

6.7

CVSS v3

NVD

Description

Nessus Agent versions 7.2.0 through 8.2.2 were found to inadvertently capture the IAM role security token on the local host during initial linking of the Nessus Agent when installed on an Amazon EC2 instance. This could allow a privileged attacker to obtain the token.

How to fix

Remediation Available

Nessus AgentWindows application

Affected:7.2.0 8.2.3Fixed in:8.2.3Tenable, Inc.

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 VectorLocal

Attack ComplexityLow

Privileges RequiredHigh

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityHigh

IntegrityHigh

AvailabilityHigh

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

Exploit Intelligence

0.35%probability of exploitation in 30 days

27thpercentile

Low risk: more likely to be exploited than 27% of all known CVEs.

References

Patch1

tenable.com

Vendor Advisory1

tenable.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 2024-11-21.