7.5
CWE
835 400
Advisory Published
CVE Published
Updated

CVE-2021-3737

First published: Mon Aug 09 2021(Updated: )

A flaw was found in python. An improperly handled HTTP response in the HTTP client code of python may allow a remote attacker, who controls the HTTP server, to make the client script enter an infinite loop, consuming CPU time. The highest threat from this vulnerability is to system availability.

Credit: secalert@redhat.com secalert@redhat.com

Affected SoftwareAffected VersionHow to fix
redhat/python3<0:3.6.8-45.el8
0:3.6.8-45.el8
redhat/python27-python<0:2.7.18-4.el7
0:2.7.18-4.el7
redhat/python<3.6.14
3.6.14
redhat/python<3.7.11
3.7.11
redhat/python<3.8.11
3.8.11
redhat/python<3.9.6
3.9.6
Python Python>=3.6.0<3.6.14
Python Python>=3.7.0<3.7.11
Python Python>=3.8.0<3.8.11
Python Python>=3.9.0<3.9.6
Redhat Codeready Linux Builder=8.0
Redhat Codeready Linux Builder For Ibm Z Systems=8.0
Redhat Codeready Linux Builder For Power Little Endian=8.0
Redhat Enterprise Linux=6.0
Redhat Enterprise Linux=7.0
Redhat Enterprise Linux=8.0
Redhat Enterprise Linux For Ibm Z Systems=8.0
Redhat Enterprise Linux For Power Little Endian=8.0
Fedoraproject Fedora=33
Fedoraproject Fedora=34
Canonical Ubuntu Linux=14.04
Canonical Ubuntu Linux=16.04
Canonical Ubuntu Linux=18.04
Canonical Ubuntu Linux=20.04
Canonical Ubuntu Linux=21.04
Netapp Hci
Netapp Management Services For Element Software
Netapp Netapp Xcp Smb
NetApp ONTAP Select Deploy administration utility
Netapp Xcp Nfs
Oracle Communications Cloud Native Core Binding Support Function=22.1.3
Oracle Communications Cloud Native Core Network Exposure Function=22.1.1
Oracle Communications Cloud Native Core Policy=22.2.0
IBM Cognos Analytics 11.2.x<=IBM Cognos Analytics 11.2.x
IBM Cognos Analytics 11.1.x<=IBM Cognos Analytics 11.1.x
debian/pypy3<=7.3.5+dfsg-2+deb11u2
7.3.11+dfsg-2+deb12u2
7.3.17+dfsg-2
debian/python2.7<=2.7.18-8+deb11u1
debian/python3.9<=3.9.2-1

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Reference Links

Parent vulnerabilities

(Appears in the following advisories)

Frequently Asked Questions

  • What is CVE-2021-3737?

    CVE-2021-3737 is a vulnerability in Python that allows a remote attacker to cause a denial of service by making the client script enter an infinite loop.

  • What is the severity of CVE-2021-3737?

    The severity of CVE-2021-3737 is high with a CVSS score of 7.5.

  • How does CVE-2021-3737 affect Python?

    CVE-2021-3737 affects Python versions 3.6.0 to 3.6.14, 3.7.0 to 3.7.11, 3.8.0 to 3.8.11, and 3.9.0 to 3.9.6.

  • How can I fix CVE-2021-3737?

    To fix CVE-2021-3737, update Python to version 3.6.15, 3.7.12, 3.8.12, or 3.9.7, depending on your installed version.

  • Where can I find more information about CVE-2021-3737?

    You can find more information about CVE-2021-3737 on the official Python bug tracker and GitHub repository.

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