critical
9.8
CWE
119 120
Advisory Published
Updated

CVE-2021-3177: Buffer Overflow

First published: Tue Jan 19 2021(Updated: )

A flaw was found in python. A stack-based buffer overflow was discovered in the ctypes module provided within Python. Applications that use ctypes without carefully validating the input passed to it may be vulnerable to this flaw, which would allow an attacker to overflow a buffer on the stack and crash the application. The highest threat from this vulnerability is to system availability.

Credit: cve@mitre.org cve@mitre.org

Affected SoftwareAffected VersionHow to fix
redhat/python<0:2.7.5-92.el7_9
0:2.7.5-92.el7_9
redhat/python3<0:3.6.8-37.el8
0:3.6.8-37.el8
redhat/python27-babel<0:0.9.6-10.el7
0:0.9.6-10.el7
redhat/python27-python<0:2.7.18-3.el7
0:2.7.18-3.el7
redhat/python27-python-jinja2<0:2.6-16.el7
0:2.6-16.el7
redhat/python27-python-pygments<0:1.5-5.el7
0:1.5-5.el7
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
Python Python>=3.6.0<=3.6.12
Python Python>=3.7.0<=3.7.9
Python Python>=3.8.0<=3.8.7
Python Python>=3.9.0<=3.9.1
Fedoraproject Fedora=32
Fedoraproject Fedora=33
Netapp Active Iq Unified Manager Vmware Vsphere
Netapp Active Iq Unified Manager Windows
NetApp ONTAP Select Deploy administration utility
Debian Debian Linux=9.0
Oracle Communications Cloud Native Core Network Function Cloud Native Environment=22.2.0
Oracle Communications Offline Mediation Controller=12.0.0.3.0
Oracle Communications Pricing Design Center=12.0.0.3.0
Oracle Enterprise Manager Ops Center=12.4.0.0
Oracle ZFS Storage Appliance Kit=8.8
debian/python2.7
2.7.18-8+deb11u1
debian/python3.9
3.9.2-1
3.9.2-1+deb11u2

Remedy

https://bugs.python.org/issue42938

Remedy

https://github.com/python/cpython/pull/24239

Remedy

https://python-security.readthedocs.io/vuln/ctypes-buffer-overflow-pycarg_repr.html

Remedy

https://www.oracle.com//security-alerts/cpujul2021.html

Remedy

https://www.oracle.com/security-alerts/cpujan2022.html

Remedy

https://www.oracle.com/security-alerts/cpujul2022.html

Remedy

https://www.oracle.com/security-alerts/cpuoct2021.html

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Reference Links

Parent vulnerabilities

(Appears in the following advisories)

Frequently Asked Questions

  • What is CVE-2021-3177?

    CVE-2021-3177 is a vulnerability in Python that allows an attacker to overflow a buffer on the stack and potentially execute arbitrary code.

  • What is the severity of CVE-2021-3177?

    The severity of CVE-2021-3177 is critical with a CVSS score of 9.8.

  • Which versions of Python are affected by CVE-2021-3177?

    Python versions 2.7.0 to 2.7.18, 3.6.0 to 3.6.12, 3.7.0 to 3.7.9, 3.8.0 to 3.8.7, and 3.9.0 to 3.9.1 are affected by CVE-2021-3177.

  • How can I fix CVE-2021-3177?

    To fix CVE-2021-3177, upgrade to Python versions 2.7.19, 3.6.13, 3.7.10, 3.8.8, or 3.9.2 or later.

  • Are there any references for CVE-2021-3177?

    Yes, you can find more information about CVE-2021-3177 at the following references: [Link 1](https://bugs.python.org/issue42938), [Link 2](https://github.com/python/cpython/pull/24239), [Link 3](https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=1918175).

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