How severe is CVE-2021-42952?

CVE-2021-42952 has a CVSS 3.x base score of 9.9, rated critical severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2021-42952 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (74th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-42952?

CVE-2021-42952 affects Zepl. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-42952?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.

When was CVE-2021-42952 published?

CVE-2021-42952 was published on 2022-02-25 and last updated on 2026-07-05.

CVE-2021-42952

CVE-2021-42952 is a critical-severity vulnerability in Zepl with a CVSS 3.x base score of 9.9. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low.

Key facts

Severity: Critical (CVSS 3.x base score 9.9)
CVSS v2: 6.5
EPSS exploit prediction: 2% (74th percentile)
Actively exploited: Not listed in CISA KEV
Affected product: Zepl
Published: 2022-02-25
Last modified: 2026-07-05

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.

Frequently asked questions

What is CVE-2021-42952?: 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 severe is CVE-2021-42952?: CVE-2021-42952 has a CVSS 3.x base score of 9.9, rated critical severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2021-42952 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (74th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-42952?: CVE-2021-42952 affects Zepl. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-42952?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
When was CVE-2021-42952 published?: CVE-2021-42952 was published on 2022-02-25 and last updated on 2026-07-05.

References

Affected products (1)

cpe:2.3:a:zepl:zepl:*:*:*:*:*:*:*:*

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CVE-2021-42950 — High (CVSS 8.8): Remote Code Execution (RCE) vulnerability exists in Zepl Notebooks all previous versions before October 25 2021. Users…

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