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CVE-2021-3426

MEDIUM
5.7
CVSS Score
Published: May 20, 2021 at 12:00 AM UTC
Updated: October 14, 2026 at 10:17 AM UTC
10 products affected across 6 vendorsDebian LinuxFedoraEnterprise Linux

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Severity
MEDIUM5.7
Exploit prediction
EPSS 2%
SSVC
No known exploit

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Debian Linux· Debiandrupal
95%
9.0
Fedora· Fedora Projectrpm
95%
323334
Cloud Backup· NetAppdrupal
95%
All versions
ONTAP Select Deploy administration utility· NetApp
95%
All versions
SnapCenter· NetAppdrupal
95%
All versions
Communications Cloud Native Core Binding Support Function· Oracle
95%
1.10.0
Zfs Storage Appliance Kit· Oracle
95%
8.8
Python· Python
95%
v < 2.7.183.6.0 ≤ v < 3.6.133.7.0 ≤ v < 3.7.103.8.0 ≤ v < 3.8.83.9.0 ≤ v < 3.9.33.10.03.10.0 alpha13.10.0 alpha23.10.0 alpha33.10.0 alpha43.10.0 alpha53.10.0 alpha63.10.0a73.8.93.9.3
Affected range stops below 2.7.18, so it looks safe — our inference, not a vendor statement
Affected range stops below 3.6.13, so it looks safe — our inference, not a vendor statement
Affected range stops below 3.7.10, so it looks safe — our inference, not a vendor statement
Affected range stops below 3.8.8, so it looks safe — our inference, not a vendor statement
Affected range stops below 3.9.3, so it looks safe — our inference, not a vendor statement
Enterprise Linux· Red Hatrpm
95%
8.0
Software Collections· Red Hatrpm
95%
All versions

References (16)

Issue TrackingPatchThird Party Advisory
Source: [email protected]
https://bugzilla.redhat.com/show_bug.cgi?id=1935913
Mailing ListThird Party Advisory
Source: [email protected]
https://lists.debian.org/debian-lts-announce/2021/04/msg00005.html
Mailing List
Source: [email protected]
https://lists.debian.org/debian-lts-announce/2023/06/msg00039.html
Vendor Advisory
Source: [email protected]
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/25HVHLBGO2KNPXJ3G426QEYSSCECJDU5/
Vendor Advisory
Source: [email protected]
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/BF2K7HEWADHN6P52R3QLIOX27U3DJ4HI/
Vendor Advisory
Source: [email protected]
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/DQYPUKLLBOZMKFPO7RD7CENTXHUUEUV7/
Vendor Advisory
Source: [email protected]
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/LM5V4VPLBHBEASSAROYPSHXGXGGPHNOE/
Vendor Advisory
Source: [email protected]
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/N6VXJZSZ6N64AILJX4CTMACYGQGHHD5C/

SSVC — Action Prioritization

SSVCNo known exploitNot automatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

5.7MEDIUMCISA-ADP
Attack Vector
ADJACENT_NETWORK
Complexity
LOW
Privileges
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
HIGH
Integrity
NONE
Availability
NONE
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-200CWE-22

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