Is CVE-2021-3426 being actively exploited?

It is not currently in CISA's KEV catalog. Its EPSS exploitation probability is 2%.

What products does CVE-2021-3426 affect?

Tracked products affected include Python. Check the version you run to see whether it is affected.

How do I fix CVE-2021-3426?

Apply the vendor fix in your normal patch cycle. An official patch or advisory is available. Upgrade affected products to a fixed version.

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CVE-2021-3426

Q: What is CVE-2021-3426?

CVE-2021-3426 is a medium-severity software vulnerability (Information disclosure) with a CVSS score of 5.7. 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 t

MEDIUM severity · CVSS 5.7 · Information disclosure

5.7CVSS MEDIUM

Summary

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.

Impact & exploitability

Attack vectorAdjacent

Attack complexityLow

Privileges requiredLow

User interactionNone

Confidentiality impactHigh

Integrity impactNone

Availability impactNone

Exploit probability (EPSS)2%

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

Affected products we track (1)

Python

Recommendation

Apply the vendor fix in your normal patch cycle. Open any affected product above for its exact safe version.

Official patch: https://bugzilla.redhat.com/show_bug.cgi?id=1935913 ↗

CVE-2021-3426

Summary

Impact & exploitability

Affected products we track (1)

Recommendation

Additional information