CVE-2021-42950Network attack vector

Authenticated code execution via crafted notebooks

Published Mar 3, 2022 · Updated Jul 9, 2026

Remote code execution in Zepl Notebooks before 2021-10-25 allows remote authenticated users to execute code through a crafted notebook. The disclosure identifies notebook creation and execution as the locus but does not describe the missing validation or isolation control that makes crafted code unsafe. An account with permission to create an organization and notebook is required, and successful exploitation executes code in the hosted notebook context.

CVSS severity8.8
High
EPSS probability1.57%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Remote code execution in Zepl Notebooks before 2021-10-25 allows remote authenticated users to execute code through a crafted notebook. The disclosure identifies notebook creation and execution as the locus but does not describe the missing validation or isolation control that makes crafted code unsafe. An account with permission to create an organization and notebook is required, and successful exploitation executes code in the hosted notebook context.

The record

CVE
CVE-2021-42950
Published
Mar 3, 2022
Updated
Jul 9, 2026
Vendor
Unknown vendor
Product
Unknown product
Classifications
T1059
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Mar 3, 2022CVE publishedPublication date reported by the CVE source.
  2. Jul 9, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

6.5NVDAV:N/AC:L/Au:S/C:P/I:P/A:P
8.8NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1059Command and Scripting Interpreter

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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