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Vulnerability of Python ipaddress: data transit via IPv4 Leading Zeros

Synthesis of the vulnerability 

An attacker can bypass filtering rules via IPv4 Leading Zeros of Python ipaddress, in order to transmit malicious data.
Vulnerable software: Solaris, Python, Ubuntu.
Severity of this announce: 2/4.
Creation date: 01/06/2021.
Références of this computer vulnerability: 36384, CVE-2021-29921, sick-2021-014, USN-4973-1, VIGILANCE-VUL-35581.

Description of the vulnerability 

An attacker can bypass filtering rules via IPv4 Leading Zeros of Python ipaddres...
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This threat impacts software or systems such as Solaris, Python, Ubuntu.

Our Vigil@nce team determined that the severity of this computer threat is medium.

The trust level is of type confirmed by the editor, with an origin of internet client.

A proof of concept or an attack tool is available, so your teams have to process this alert. An attacker with a specialist ability can exploit this cybersecurity bulletin.

Solutions for this threat 

Workarounds for this vulnerability are not yet public.
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