Is CVE-2021-21999 in the CISA KEV catalog?

No. CVE-2021-21999 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2021-21999?

CVE-2021-21999 has a CVSS v3 base score of 7.8 (HIGH).

What is the EPSS score for CVE-2021-21999?

CVE-2021-21999 has an EPSS score of 1.46% (71th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2021-21999?

Upgrade app volumes to 2103 or later. Fixes are available for 3 affected products.

CVE & CISA-KEV Catalog

CVE-2021-21999

HIGHEPSS 71th pctl

7.8

CVSS v3

NVD

Description

VMware Tools for Windows (11.x.y prior to 11.2.6), VMware Remote Console for Windows (12.x prior to 12.0.1) , VMware App Volumes (2.x prior to 2.18.10 and 4 prior to 2103) contain a local privilege escalation vulnerability. An attacker with normal access to a virtual machine may exploit this issue by placing a malicious file renamed as `openssl.cnf' in an unrestricted directory which would allow code to be executed with elevated privileges.

CWE-427

How to fix

Remediation Available

app volumesNVD

Affected:>= 4, < 2103Fixed in:2103CVE-2021-21999derived from NVD

remote consoleNVD

Affected:>= 12.0.0, < 12.0.1Fixed in:12.0.1CVE-2021-21999derived from NVD

toolsNVD

Affected:>= 11.0.0, < 11.2.6Fixed in:11.2.6CVE-2021-21999derived from NVD

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 VectorLocal

Attack ComplexityLow

Privileges RequiredLow

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityHigh

IntegrityHigh

AvailabilityHigh

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

Exploit Intelligence

1.46%probability of exploitation in 30 days

71stpercentile

Elevated risk: more likely to be exploited than 71% of all known CVEs.

References

Patch1

vmware.com

Third-Party Advisory1

zerodayinitiative.com

Related Vulnerabilities

Other CWE-427 vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2020-27955	Critical	9.8	83%	-	-
CVE-2017-6517	Critical	9.8	46%	-	-
CVE-2020-3153	Medium	6.5	28%	KEV + Ransom	Fix
CVE-2024-48990	High	7.8	20%	-	Fix
CVE-2019-9491	High	7.8	13%	-	-
CVE-2020-3433	High	7.8	10%	KEV + Ransom	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 2024-11-21.