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CVE-2021-3426

MEDIUMCVSS 5.7/10EPSS 1.86%

Last modified

CVE-2021-3426 is a medium-severity vulnerability rated 5.7/10 on the CVSS scale. 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. EPSS estimates a 1.86% chance of exploitation in the next 30 days.

Description

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.

Metrics

CVSS 3.1
5.7/10

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

EPSS Probability
1.86%

76.6th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

VendorProductVersionsUpdate
PythonPython< 2.7.18—
PythonPython>= 3.6.0, < 3.6.13—
PythonPython>= 3.7.0, < 3.7.10—
PythonPython>= 3.8.0, < 3.8.8—
PythonPython>= 3.9.0, < 3.9.3—
PythonPython3.10.0Alpha1
FedoraprojectFedora32—
FedoraprojectFedora33—
FedoraprojectFedora34—
DebianDebian Linux9.0—
RedhatSoftware CollectionsAll versions—
RedhatEnterprise Linux8.0—
NetappCloud BackupAll versions—
NetappOntap Select Deploy Administration UtilityAll versions—
NetappSnapcenterAll versions—
OracleCommunications Cloud Native Core Binding Support Function1.10.0—
OracleZfs Storage Appliance Kit8.8—

References

Timeline

Published
Last Modified
Status
Modified

Frequently Asked Questions

What is 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 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.
How severe is CVE-2021-3426?
CVE-2021-3426 has a CVSS score of 5.7/10 (MEDIUM severity). The EPSS model estimates a 1.86% probability of exploitation in the next 30 days.
How do I fix CVE-2021-3426?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

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Source: NVD / NIST