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CVE Record

CVE-2021-42952: Zepl Notebooks before 2021-10-25 are affected by a sandbox escape vulnerability.

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.

UnknownCVSS not scoredNot KEV-listedUpdated
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Glexia's TakeAutomated analysishigh

Security readout for executives and security teams

Plain-English summary

Zepl Notebooks before 2021-10-25 allowed notebook users who could run code to break out of the intended sandbox. The reported impact includes access to internal Zepl assets and cloud metadata services. This is serious for environments using affected Zepl notebooks, but public sources do not show CISA KEV listing or active exploitation.

Executive priority

Prioritize review if Zepl Notebooks were used before 2021-10-25. The business risk is unauthorized access from analytics notebooks into internal or cloud resources.

Technical view

CVE-2021-42952 is a sandbox escape in Zepl Notebooks before 2021-10-25. The CVE description says that after launching remote code execution from a notebook, a user could escape the running context sandbox and reach internal assets, including cloud metadata services. No CVSS score, CWE, or detailed vendor remediation is provided in the supplied sources.

Likely exposure

Exposure is likely limited to organizations using Zepl Notebooks versions before 2021-10-25, especially where users can execute notebook code in hosted or cloud-connected environments.

Exploitation context

The sources describe post-notebook-code-execution sandbox escape. They do not provide evidence of active exploitation, public exploit availability, or CISA KEV inclusion.

Researcher notes

Public data is sparse: no CVSS, CWE, CPE, or detailed patch note is included in the supplied CVE record. The main technical claim is sandbox escape after notebook code execution, with potential internal asset and cloud metadata exposure.

Mitigation direction

  • Identify any Zepl Notebook deployments and determine their version or deployment date.
  • Upgrade or migrate off Zepl Notebooks before 2021-10-25 per vendor guidance.
  • Restrict notebook code execution to trusted users until exposure is resolved.
  • Review cloud metadata service access controls for notebook runtime environments.
  • Check vendor or service-provider guidance for confirmed fixes and hardening steps.

Validation and detection

  • Confirm whether Zepl Notebooks are present in the environment.
  • Verify deployed versions are not earlier than 2021-10-25.
  • Review notebook runtime isolation and metadata access configuration.
  • Check logs for unusual access from notebook runtimes to internal assets.
  • Document compensating controls if immediate upgrade status is unclear.
Prepared
Confidence
medium
Sources
3

Public sources used

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

Conservative CVE-to-ATT&CK context

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ATT&CK lookup starting points

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description · low confidence lookup

Execution behavior lookup

The CVE wording references code or command execution, so execution technique review may help defensive triage. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.

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Privilege behavior lookup

The CVE wording references privilege impact, so privilege escalation and authorization behavior review may help. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.

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description · low confidence lookup

Cloud metadata behavior lookup

The CVE wording references SSRF or metadata access, so cloud discovery and credential material review may help. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.

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CVE-2021-42952 mapping review

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Vulnerability profileCVE Program record
Severity
Unknown
CVSS
Not scored
Known Exploited
No
Published
Official CVE source material

CNA and ADP enrichment extracted from CVE v5

These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.

0CVSS vectors
3Timeline events
1ADP providers
2Source links

Vulnerability timeline

Timeline events are normalized from CVE metadata, CNA source timelines, ADP timelines, and KEV metadata when present.

  1. CVE reservedCVE Program

    The CVE ID was reserved by the assigning CNA.

  2. CVE publishedCVE Program

    The CVE record was published.

  3. CVE updatedCVE Program

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ADP provider summaries

CVECVE Program Container

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
n/an/an/aListed
Weakness

CWE details

No CWE listed

CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.