Is CVE-2021-42952 in the CISA KEV catalog?

No. CVE-2021-42952 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2021-42952?

CVE-2021-42952 has a CVSS v3 base score of 9.9 (CRITICAL).

What is the EPSS score for CVE-2021-42952?

CVE-2021-42952 has an EPSS score of 1.65% (74th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2021-42952?

Upgrade zepl to 2021-10-25 or later.

CVE & CISA-KEV Catalog

CVE-2021-42952

CRITICALEPSS 74th pctl

9.9

CVSS v3

NVD

Description

Zepl Notebooks before 2021-10-25 are affected by a sandbox escape vulnerability. Upon launching Remote Code Execution from the Notebook, users can then use that to subsequently escape the running context sandbox and proceed to access internal Zepl assets including cloud metadata services.

How to fix

Remediation Available

zeplNVD

Affected:< 2021-10-25Fixed in:2021-10-25CVE-2021-42952derived 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 RequiredLow

User InteractionNone

ScopeChanged

Impact

ConfidentialityHigh

IntegrityHigh

AvailabilityHigh

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

Exploit Intelligence

1.65%probability of exploitation in 30 days

74thpercentile

Elevated risk: more likely to be exploited than 74% of all known CVEs.

References

Vendor Advisory1

zepl.com

Third-Party Advisory1

seclists.org

Embed a live status badge for CVE-2021-42952

Markdown

[![CVE-2021-42952](https://tridentstack.com/cve/badge/CVE-2021-42952.svg)](https://tridentstack.com/cve/CVE-2021-42952)

HTML

<a href="https://tridentstack.com/cve/CVE-2021-42952"><img src="https://tridentstack.com/cve/badge/CVE-2021-42952.svg" alt="CVE-2021-42952"></a>

Find and fix vulnerabilities across your fleet

TridentStack Control continuously scans your Windows, macOS, and Linux fleet for known vulnerabilities, prioritizes them by severity and active exploitation, and patches them automatically.

Start free

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 2026-07-05.