Is CVE-2021-33907 in the CISA KEV catalog?

No. CVE-2021-33907 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2021-33907?

CVE-2021-33907 has a CVSS v3 base score of 9.8 (CRITICAL).

What is the EPSS score for CVE-2021-33907?

CVE-2021-33907 has an EPSS score of 3.02% (86th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2021-33907?

Upgrade Zoom Workplace to 5.3.0 or later.

CVE & CISA-KEV Catalog

CVE-2021-33907

CRITICALEPSS 86th pctl

9.8

CVSS v3

NVD

Description

The Zoom Client for Meetings for Windows in all versions before 5.3.0 fails to properly validate the certificate information used to sign .msi files when performing an update of the client. This could lead to remote code execution in an elevated privileged context.

CWE-295Improper Certificate Validation

How to fix

Remediation Available

Zoom WorkplaceWindows application

Affected:5.3.0Fixed in:5.3.0Zoom

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

ConfidentialityHigh

IntegrityHigh

AvailabilityHigh

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

Exploit Intelligence

3.02%probability of exploitation in 30 days

86thpercentile

Elevated risk: more likely to be exploited than 86% of all known CVEs.

References

Vendor Advisory1

explore.zoom.us

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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.