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CVE Record

CVE-2021-42950: Remote Code Execution (RCE) vulnerability exists in Zepl Notebooks all previous versions before October 25...

Remote Code Execution (RCE) vulnerability exists in Zepl Notebooks all previous versions before October 25 2021. Users can register for an account and are allocated a set number of credits to try the product. Once users authenticate, they can proceed to create a new organization by which additional users can be added for various collaboration abilities, which allows malicious user to create new Zepl Notebooks with various languages, contexts, and deployment scenarios. Upon creating a new notebook with specially crafted malicious code, a user can then launch remote code execution.

UnknownCVSS not scoredNot KEV-listedUpdated
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Glexia's TakeAutomated analysishigh

Security readout for executives and security teams

Plain-English summary

CVE-2021-42950 is a remote code execution issue in Zepl Notebooks versions before October 25, 2021. An authenticated user could create notebooks containing specially crafted malicious code and execute code remotely. This is serious where untrusted users can sign up, authenticate, or collaborate.

Executive priority

Prioritize if Zepl Notebooks is deployed and accepts untrusted users. Remote code execution can affect confidentiality, integrity, and availability, but the public record lacks severity scoring and exploitation evidence.

Technical view

The public description states authenticated users can register, create an organization, add users, and create Zepl Notebooks with various languages, contexts, and deployment scenarios. A specially crafted notebook can trigger remote code execution. No CVSS score, CWE, affected CPEs, or detailed fixed version are provided in the source bundle.

Likely exposure

Organizations using Zepl Notebooks versions before October 25, 2021 are potentially exposed. Risk is higher if user registration, trial access, or notebook creation is available to untrusted or lightly vetted users.

Exploitation context

Public sources describe the vulnerability mechanism but do not cite active exploitation. It is not listed as CISA KEV in the provided bundle. Exploitation appears to require authentication and the ability to create a notebook.

Researcher notes

Evidence is sparse. The CVE description and Full Disclosure reference identify authenticated notebook-based RCE before October 25, 2021, but do not provide CVSS, CWE, CPEs, or explicit patch details. Avoid assuming exploit maturity or affected deployment models beyond the cited text.

Mitigation direction

  • Identify whether Zepl Notebooks is in use.
  • Confirm the deployed version or service date is October 25, 2021 or later.
  • Review Zepl vendor guidance for the corrected release and any configuration mitigations.
  • Restrict notebook creation to trusted users until remediation is confirmed.
  • Review accounts, organizations, and notebooks created by untrusted users.

Validation and detection

  • Inventory Zepl Notebooks deployments and ownership.
  • Check whether public registration or trial access is enabled.
  • Verify users require authentication before notebook creation.
  • Review audit logs for suspicious notebook creation or execution activity.
  • Confirm remediation status against vendor guidance or release information.
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

These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.

ATT&CK lookup starting points

Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.

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.

Open ATT&CK lookup
cve · low confidence lookup

CVE-2021-42950 mapping review

Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.

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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

    The CVE record metadata indicates this as the latest update time.

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.