synced 4 MIN AGO
01 Record

CVE-2020-8492

Python 2.7 through 2.7.17, 3.5 through 3.5.9, 3.6 through 3.6.10, 3.7 through 3.7.6, and 3.8 through 3.8.1 allows an HTTP server to conduct Regular Expression Denial of Service (ReDoS) attacks against

MediumPUBLISHEDCNA: mitre
CNA base score6.5 CVSS v3.xCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
View raw JSON

02 Description

Python 2.7 through 2.7.17, 3.5 through 3.5.9, 3.6 through 3.6.10, 3.7 through 3.7.6, and 3.8 through 3.8.1 allows an HTTP server to conduct Regular Expression Denial of Service (ReDoS) attacks against

03 Exploitation and scoring

Exploitation
Assessed, none found. CISA's assessment recorded neither public exploit code nor evidence of exploitation when it was made.
SSVC decision
  • ExploitationnoneCISA recorded no public exploit code and no evidence of exploitation.
  • AutomatablenoAt least one step from reconnaissance to exploitation cannot be reliably automated.
  • Technical ImpactpartialSuccessful exploitation gives limited control of the vulnerable component.
CISA publishes the decision points, not a final SSVC decision. The decision also depends on mission and well-being impact, which is a property of your deployment rather than of the vulnerability.
EPSS probability
6.61% probability of exploitation activity in the next 30 days.
EPSS percentile
Equal to or higher than the score of 93.7% of scored records. A rank, not a probability.
NVD base score
6.5 (CVSS v3.x), scored by the NVD independently of the CNA.
NVD CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
NVD analysis status
Modified. NVD last modified this record on 2026-10-14.
Red Hat severity
Moderate. Red Hat's rating for its own products, not a CVSS rating.

Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.

04 Metadata

Published
2020-01-30 00:00Z6 YR AGO
Last updated
2026-10-14 08:40Z15 DAYS AGO
Reserved
2020-01-30
Assigning CNA
mitre
Record state
PUBLISHED
Severity
Medium (CVSS 6.5)
CNA CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
Weaknesses
  • CWE-400Uncontrolled Resource ConsumptionClass
Data version
5.2
Document digest
91d045355e3d74b394c9d93c74c12b560e2df69e3e075d42036f94264441769f

05 Affected products

VendorProductVersionsPlatforms
canonicalubuntu_linuxNot specified—
debiandebian_linuxNot specified—
fedoraprojectfedoraNot specified—
opensuseleapNot specified—
pythonpythonNot specified—
redhatenterprise_linuxNot specified—
redhatrhel_software_collectionsNot specified—

06 References

07 Fixed in

AlmaLinux 8

  • python38-Cython
    Fixed in 0.29.14-4.module_el8.6.0+2778+cd494b30
  • python38-asn1crypto
    Fixed in 1.2.0-3.module_el8.6.0+2778+cd494b30
  • python38-cffi
    Fixed in 1.13.2-3.module_el8.6.0+2778+cd494b30
  • python38-chardet
    Fixed in 3.0.4-19.module_el8.6.0+2778+cd494b30
  • python38-cryptography
    Fixed in 2.8-3.module_el8.6.0+2778+cd494b30
  • python38-idna
    Fixed in 2.8-6.module_el8.6.0+2778+cd494b30
  • python38-markupsafe
    Fixed in 1.1.1-6.module_el8.6.0+2778+cd494b30
  • python38-mod_wsgi
    Fixed in 4.6.8-3.module_el8.6.0+2778+cd494b30
  • python38-psycopg2
    Fixed in 2.8.4-4.module_el8.6.0+2778+cd494b30
  • python38-psycopg2-doc
    Fixed in 2.8.4-4.module_el8.6.0+2778+cd494b30
  • python38-psycopg2-tests
    Fixed in 2.8.4-4.module_el8.6.0+2778+cd494b30
  • python38-pycparser
    Fixed in 2.19-3.module_el8.6.0+2778+cd494b30
  • python38-pysocks
    Fixed in 1.7.1-4.module_el8.6.0+2778+cd494b30
  • python38-pytz
    Fixed in 2019.3-3.module_el8.6.0+2778+cd494b30
  • python38-requests
    Fixed in 2.22.0-9.module_el8.6.0+2778+cd494b30
  • python38-scipy
    Fixed in 1.3.1-4.module_el8.6.0+2778+cd494b30

Source: AlmaLinux, AlmaLinux OS. Copyright (c) 2023 AlmaLinux OS. Licensed under MIT License. Received through OSV.dev. Reformatted by exploit.cc.

CloudLinux 8

  • python38-Cython
    Fixed in 0.29.14-4.module_el8.6.0+2778+cd494b30
  • python38-asn1crypto
    Fixed in 1.2.0-3.module_el8.6.0+2778+cd494b30
  • python38-cffi
    Fixed in 1.13.2-3.module_el8.6.0+2778+cd494b30
  • python38-chardet
    Fixed in 3.0.4-19.module_el8.6.0+2778+cd494b30
  • python38-cryptography
    Fixed in 2.8-3.module_el8.6.0+2778+cd494b30
  • python38-idna
    Fixed in 2.8-6.module_el8.6.0+2778+cd494b30
  • python38-markupsafe
    Fixed in 1.1.1-6.module_el8.6.0+2778+cd494b30
  • python38-mod_wsgi
    Fixed in 4.6.8-3.module_el8.6.0+2778+cd494b30
  • python38-psycopg2
    Fixed in 2.8.4-4.module_el8.6.0+2778+cd494b30
  • python38-psycopg2-doc
    Fixed in 2.8.4-4.module_el8.6.0+2778+cd494b30
  • python38-psycopg2-tests
    Fixed in 2.8.4-4.module_el8.6.0+2778+cd494b30
  • python38-pycparser
    Fixed in 2.19-3.module_el8.6.0+2778+cd494b30
  • python38-pysocks
    Fixed in 1.7.1-4.module_el8.6.0+2778+cd494b30
  • python38-pytz
    Fixed in 2019.3-3.module_el8.6.0+2778+cd494b30
  • python38-requests
    Fixed in 2.22.0-9.module_el8.6.0+2778+cd494b30
  • python38-scipy
    Fixed in 1.3.1-4.module_el8.6.0+2778+cd494b30

Derived from AlmaLinux 8. Partial coverage: only packages taken from AlmaLinux 8 are listed.

Source: CloudLinux errata, CloudLinux Inc. Derived from: AlmaLinux, AlmaLinux OS. Copyright (c) 2023 AlmaLinux OS. Licensed under MIT License. Received through OSV.dev. Reformatted by exploit.cc.

Debian 11

  • python2.7
    Fixed in 2.7.18-2

Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.

Ubuntu 16.04 LTS

  • python2.7
    Fixed in 2.7.12-1ubuntu0~16.04.11
  • python3.5
    Fixed in 3.5.2-2ubuntu0~16.04.10

Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.

Ubuntu 18.04 LTS

  • python2.7
    Fixed in 2.7.17-1~18.04ubuntu1
  • python3.6
    Fixed in 3.6.9-1~18.04ubuntu1
  • python3.7
    Fixed in 3.7.5-2ubuntu1~18.04.2
  • python3.8
    Fixed in 3.8.0-3ubuntu1~18.04.2

Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.

Ubuntu 20.04 LTS

  • python2.7
    Fixed in 2.7.18-1~20.04.1
  • python3.8
    Fixed in 3.8.2-1ubuntu1.1

Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.

Ubuntu Pro 14.04 LTS

  • python2.7
    Fixed in 2.7.6-8ubuntu0.6+esm5
    Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro
  • python3.4
    Fixed in 3.4.3-1ubuntu1~14.04.7+esm6
    Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro
  • python3.5
    Fixed in 3.5.2-2ubuntu0~16.04.4~14.04.1+esm1
    Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro

Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.

A release or ecosystem missing from this list has no record here. It may be unaffected or not covered by the source. Source notices and licences.