CVE-2021-3426 : There's a flaw in Python 3's pydoc. A local or adjacent attacker who discovers or is able to convince another local or a

There's a flaw in Python 3's pydoc. A local or adjacent attacker who discovers or is able to convince another local or adjacent user to start a pydoc server could access the server and use it to disclose sensitive information belonging to the other user that they would not normally be able to access. The highest risk of this flaw is to data confidentiality. This flaw affects Python versions before 3.8.9, Python versions before 3.9.3 and Python versions before 3.10.0a7.

Published 2021-05-20 13:15:08

Updated 2023-06-30 23:15:10

Source Red Hat, Inc.

View at NVD, CVE.org

Vulnerability category: Directory traversalInformation leak

Threat overview for CVE-2021-3426

Top countries where our scanners detected CVE-2021-3426

Top open port discovered on systems with this issue 80

IPs affected by CVE-2021-3426 386,906

Threat actors abusing to this issue? Yes

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^*Directly or indirectly through your vendors, service providers and 3rd parties. Powered by attack surface intelligence from SecurityScorecard.

Exploit prediction scoring system (EPSS) score for CVE-2021-3426

EPSS FAQ

0.06%

Probability of exploitation activity in the next 30 days EPSS Score History

~ 24 %

Percentile, the proportion of vulnerabilities that are scored at or less

CVSS scores for CVE-2021-3426

Base Score	Base Severity	CVSS Vector	Exploitability Score	Impact Score	Score Source
2.7	LOW	AV:A/AC:L/Au:S/C:P/I:N/A:N	5.1	2.9	NIST
Access Vector: Adjacent Network Access Complexity: Low Authentication: Single Confidentiality Impact: Partial Integrity Impact: None Availability Impact: None
5.7	MEDIUM	CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N	2.1	3.6	NIST
Attack Vector: Adjacent Network Attack Complexity: Low Privileges Required: Low User Interaction: None Scope: Unchanged Confidentiality: High Integrity: None Availability: None

CWE ids for CVE-2021-3426

CWE-22 Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')

The product uses external input to construct a pathname that is intended to identify a file or directory that is located underneath a restricted parent directory, but the product does not properly neutralize special elements within the pathname that can cause the pathname to resolve to a location that is outside of the restricted directory.

Assigned by: nvd@nist.gov (Primary)

CWE-200 Exposure of Sensitive Information to an Unauthorized Actor

The product exposes sensitive information to an actor that is not explicitly authorized to have access to that information.

Assigned by: secalert@redhat.com (Secondary)

References for CVE-2021-3426

Products affected by CVE-2021-3426