CVE-2021-3733
First published: Tue Aug 10 2021(Updated: )
Last updated 24 July 2024
Credit: secalert@redhat.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| redhat/python3 | <0:3.6.8-39.el8_4 | 0:3.6.8-39.el8_4 |
| redhat/rh-python38-babel | <0:2.7.0-12.el7 | 0:2.7.0-12.el7 |
| redhat/rh-python38-python | <0:3.8.11-2.el7 | 0:3.8.11-2.el7 |
| redhat/rh-python38-python-cryptography | <0:2.8-5.el7 | 0:2.8-5.el7 |
| redhat/rh-python38-python-jinja2 | <0:2.10.3-6.el7 | 0:2.10.3-6.el7 |
| redhat/rh-python38-python-lxml | <0:4.4.1-7.el7 | 0:4.4.1-7.el7 |
| redhat/rh-python38-python-pip | <0:19.3.1-2.el7 | 0:19.3.1-2.el7 |
| redhat/rh-python38-python-urllib3 | <0:1.25.7-7.el7 | 0:1.25.7-7.el7 |
| 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 | <3.8.10 | 3.8.10 |
| redhat/python | <3.9.5 | 3.9.5 |
| IBM Cognos Analytics | <=IBM Cognos Analytics 11.2.x | |
| IBM Cognos Analytics | <=IBM Cognos Analytics 11.1.x | |
| Python 2.7 | <3.6.14 | |
| Python 2.7 | >=3.7.0<3.7.11 | |
| Python 2.7 | >=3.8.0<3.8.10 | |
| Python 2.7 | >=3.9.0<3.9.5 | |
| Python 2.7 | =3.10.0 | |
| Red Hat CodeReady Linux Builder | =8.0 | |
| Red Hat CodeReady Linux Builder for IBM z Systems | =8.0 | |
| Red Hat CodeReady Linux Builder for Power, little endian | =8.0 | |
| Red Hat Enterprise Linux | =8.0 | |
| Red Hat Enterprise Linux Server EUS | =8.4 | |
| Red Hat Enterprise Linux for IBM Z Systems | =8.0 | |
| Red Hat Enterprise Linux for IBM Z Systems (s390x) | =8.4 | |
| Red Hat Enterprise Linux for Power, little endian | =8.0 | |
| Red Hat Enterprise Linux for Power, little endian - Extended Update Support | =8.4 | |
| Red Hat Enterprise Linux Server | =8.4 | |
| Red Hat Enterprise Linux for SAP Applications for Power, little endian - Extended Update Support | =8.4 | |
| Red Hat Enterprise Linux Server | =8.4 | |
| Red Hat Enterprise Linux Server Update Services for SAP Solutions | =8.4 | |
| Fedora EPEL | =7.0 | |
| Red Hat Fedora | =33 | |
| Red Hat Fedora | =34 | |
| Red Hat Fedora | =35 | |
| Red Hat Fedora | =36 | |
| NetApp Management Services for NetApp HCI | ||
| NetApp ONTAP Select Deploy | ||
| NetApp SolidFire Enterprise SDS | ||
| NetApp HCI Compute Node Firmware | ||
| debian/pypy3 | 7.3.5+dfsg-2+deb11u2 7.3.5+dfsg-2+deb11u4 7.3.11+dfsg-2+deb12u3 7.3.19+dfsg-1 7.3.19+dfsg-2 | |
| debian/python2.7 | <=2.7.18-8+deb11u1 | |
| debian/python3.9 | <=3.9.2-1 | 3.9.2-1+deb11u3 |
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Reference Links
- https://www.cve.org/CVERecord?id=CVE-2021-3733 https://nvd.nist.gov/vuln/detail/CVE-2021-3733 https://docs.python.org/3.6/whatsnew/changelog.html#python-3-6-14-final https://docs.python.org/3.7/whatsnew/changelog.html#python-3-7-11-final https://docs.python.org/3.8/whatsnew/changelog.html#python-3-8-10-final https://docs.python.org/3.9/whatsnew/changelog.html#python-3-9-5-final
- https://bugzilla.redhat.com/show_bug.cgi?id=1995234
- https://access.redhat.com/errata/RHSA-2021:4057
- https://access.redhat.com/errata/RHSA-2021:4160
- https://access.redhat.com/errata/RHSA-2022:1764
- https://access.redhat.com/errata/RHSA-2022:1821
- https://access.redhat.com/errata/RHSA-2021:3254
- https://access.redhat.com/errata/RHSA-2022:1663
- https://access.redhat.com/security/cve/cve-2021-3733
- https://bugs.python.org/issue43075
- https://github.com/python/cpython/commit/7215d1ae25525c92b026166f9d5cac85fb
- https://github.com/python/cpython/pull/24391
- https://ubuntu.com/security/CVE-2021-3733
- https://security.netapp.com/advisory/ntap-20220407-0001/
- https://lists.debian.org/debian-lts-announce/2023/05/msg00024.html
- https://lists.debian.org/debian-lts-announce/2023/06/msg00039.html
- https://launchpad.net/bugs/cve/CVE-2021-3733
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=1809065
- https://datatracker.ietf.org/doc/html/rfc2617#section-2
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=2000683
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=2000681
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=2000685
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=2000686
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=2000687
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=2000684
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=2000688
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=2000682
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=1995234#c10
- https://exchange.xforce.ibmcloud.com/vulnerabilities/213034
- https://www.ibm.com/support/pages/node/6828527 (Advisory)
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-3733
- https://nvd.nist.gov/vuln/detail/CVE-2021-3733
- https://security-tracker.debian.org/tracker/CVE-2021-3733
- https://github.com/python/cpython/commit/7215d1ae25525c92b026166f9d5cac85fb1defe1
- https://github.com/python/cpython/commit/a21d4fbd549ec9685068a113660553d7f80d9b09
- https://github.com/python/cpython/commit/e7654b6046090914a8323931ed759a94a5f85d60
- https://github.com/python/cpython/commit/ada14995870abddc277addf57dd690a2af04c2da
- https://github.com/python/cpython/commit/3fbe96123aeb66664fa547a8f6022efa2dc8788f
- https://github.com/pypy/pypy/commit/d670377acb9e9217c4c21164428ba4b528e5b389
Parent vulnerabilities
(Appears in the following advisories)
Frequently Asked Questions
What is CVE-2021-3733?
CVE-2021-3733 is a vulnerability in urllib's AbstractBasicAuthHandler class that allows an attacker to trigger a Regular Expression Denial of Service (ReDOS) during an authentication request.
What can an attacker do with CVE-2021-3733?
An attacker who controls a malicious HTTP server can exploit CVE-2021-3733 to launch a ReDOS attack on an HTTP client (e.g., web browser).
How severe is CVE-2021-3733?
CVE-2021-3733 has a severity rating of 6.5, which is considered medium.
Which software versions are affected by CVE-2021-3733?
CVE-2021-3733 affects Python versions 3.6.14, 3.7.11, 3.8.10, and 3.9.5, as well as other related packages.
How can I mitigate CVE-2021-3733?
To mitigate CVE-2021-3733, it is recommended to update to the fixed versions of Python and related packages provided by Red Hat.
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