CVE-2021-41247
3.5 · LOWOverview
CVE-2021-41247 is a low-severity vulnerability affecting jupyter jupyterhub. It was published on November 4, 2021 and has a CVSS 3.1 base score of 3.5 (LOW).
This vulnerability has a CVSS 3.1 base score of 3.5, rated LOW. It can be exploited remotely over the network. Some level of privileges is required for exploitation.
Technical Description
JupyterHub is an open source multi-user server for Jupyter notebooks. In affected versions users who have multiple JupyterLab tabs open in the same browser session, may see incomplete logout from the single-user server, as fresh credentials (for the single-user server only, not the Hub) reinstated after logout, if another active JupyterLab session is open while the logout takes place. Upgrade to JupyterHub 1.5. For distributed deployments, it is jupyterhub in the _user_ environment that needs patching. There are no patches necessary in the Hub environment. The only workaround is to make sure that only one JupyterLab tab is open when you log out.
Remediation
Check the references section for vendor advisories and patches from jupyter. Update jupyterhub to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.
Affected Products
| Vendor | Product | Versions | Status |
|---|---|---|---|
| jupyter | jupyterhub | >= 1.0.0, < 1.5.0 | Affected |
References
Frequently Asked Questions
What is CVE-2021-41247?
CVE-2021-41247 is a low-severity vulnerability affecting jupyter jupyterhub. It was published on November 4, 2021 and has a CVSS 3.1 base score of 3.5 (LOW).
How severe is CVE-2021-41247?
This vulnerability has a CVSS 3.1 base score of 3.5, rated LOW. It can be exploited remotely over the network. Some level of privileges is required for exploitation.
How do I fix or remediate CVE-2021-41247?
Check the references section for vendor advisories and patches from jupyter. Update jupyterhub to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.
How can CyberStrike help with CVE-2021-41247?
CyberStrike's AI-powered security agents can automatically detect CVE-2021-41247 across your infrastructure using autonomous pentesting, DAST scanning, and HackBrowser. The platform continuously monitors for known vulnerabilities and provides actionable remediation guidance prioritized by real-world exploitability.
How CyberStrike Helps
AI agents map your attack surface to find vulnerabilities like this one.
Automated penetration testing that runs continuously, not just quarterly.
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