PT-2019-6075 · Python+8 · Python+8
Published
2019-03-20
·
Updated
2026-05-18
·
CVE-2021-29921
CVSS v3.1
9.1
Critical
| Vector | AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N |
Name of the Vulnerable Software and Affected Versions
Python versions prior to 3.9.5
Python versions 3.8.0 through 3.10
Description
The issue is related to the ipaddress library in Python, which mishandles leading zero characters in the octets of an IP address string. This can allow attackers to bypass access control based on IP addresses, potentially leading to unauthorized access to confidential data, disruption of data integrity, and denial of service. The vulnerability can be exploited by remote attackers and may result in indeterminate SSRF and RFI vulnerabilities.
Recommendations
For Python versions prior to 3.9.5, update to version 3.9.5 or later to resolve the issue.
For Python versions 3.8.0 through 3.10, update to a version outside of this range to mitigate the risk.
As a temporary workaround, consider restricting the use of the ipaddress library until a patch is available.
Avoid using the ipaddress library for access control decisions based on IP addresses until the issue is resolved.
At the moment, there is no information about additional mitigation measures.
Exploit
Fix
RCE
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Weakness Enumeration
Related Identifiers
Affected Products
Alt Linux
Almalinux
Centos
Linuxmint
Python
Red Hat
Rocky Linux
Suse
Ubuntu