Is CVE-2021-41247 in the CISA KEV catalog?

No. CVE-2021-41247 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2021-41247?

CVE-2021-41247 has a CVSS v3 base score of 3.5 (LOW).

What is the EPSS score for CVE-2021-41247?

CVE-2021-41247 has an EPSS score of 0.78% (51th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2021-41247?

Upgrade jupyterhub on debian 12 to 2.0.0+ds1-1 or later.

CVE & CISA-KEV Catalog

CVE-2021-41247

LOW

3.5

CVSS v3

NVD

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.

CWE-613

How to fix

Remediation Available

jupyterhubDebian

Fixed in:2.0.0+ds1-1CVE-2021-41247

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredLow

User InteractionRequired

ScopeUnchanged

Impact

ConfidentialityLow

IntegrityNone

AvailabilityNone

CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:N/A:N

Exploit Intelligence

0.78%probability of exploitation in 30 days

51stpercentile

Moderate risk: more likely to be exploited than 51% of all known CVEs.

References

Patch1

github.com

Third-Party Advisory1

github.com

Related Vulnerabilities

Other CWE-613 vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2014-2595	Critical	9.8	17%	-	-
CVE-2023-30403	High	7.5	15%	-	-
CVE-2020-27422	Critical	9.8	7.8%	-	-
CVE-2014-3616	Medium	4.3	5.7%	-	Fix
CVE-2021-3144	Critical	9.1	5.2%	-	Fix
CVE-2021-24019	High	8.1	3.8%	-	Fix

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2024-11-21.