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Mend.io Vulnerability Database

CVE-2021-29921

Date: May 5, 2021

In Python before 3,9,5, the ipaddress library mishandles leading zero characters in the octets of an IP address string. This (in some situations) allows attackers to bypass access control that is based on IP addresses.

Language: PHP

Severity Score

9.8

Related Resources (22)

Url: https://docs.python.org/3/library/ipaddress.html

Url: https://github.com/python/cpython/blob/63298930fb531ba2bb4f23bc3b915dbf1e17e9e1/Misc/NEWS.d/3.8.0a4.rst

Url: https://security.netapp.com/advisory/ntap-20210622-0003/

Url: https://sick.codes/sick-2021-014

Url: https://security-tracker.debian.org/tracker/CVE-2021-29921

Url: https://python-security.readthedocs.io/vuln/ipaddress-ipv4-leading-zeros.html

Url: https://bugs.python.org/issue36384

Url: https://people.canonical.com/~ubuntu-security/cve/CVE-2021-29921

Url: https://access.redhat.com/security/cve/CVE-2021-29921

Url: https://github.com/python/cpython/pull/12577

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

Url: https://nvd.nist.gov/vuln/detail/CVE-2021-29921

Url: https://github.com/sickcodes/security/blob/master/advisories/SICK-2021-014.md

Url: https://security.alpinelinux.org/vuln/CVE-2021-29921

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

Url: https://www.oracle.com/security-alerts/cpuapr2022.html

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

Url: https://security.gentoo.org/glsa/202305-02

Url: https://github.com/python/cpython/pull/25099

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

Url: https://github.com/sickcodes

Url: https://www.mend.io/vulnerability-database/CVE-2021-29921

Severity Score

9.8

Weakness Type (CWE)

Improper Input Validation

CWE-20

CVSS v3.1

Base Score:	9.8
Attack Vector (AV):	NETWORK
Attack Complexity (AC):	LOW
Privileges Required (PR):	NONE
User Interaction (UI):	NONE
Scope (S):	UNCHANGED
Confidentiality (C):	HIGH
Integrity (I):	HIGH
Availability (A):	HIGH

CVSS v2

Base Score:	7.5
Access Vector (AV):	NETWORK
Access Complexity (AC):	LOW
Authentication (AU):	NONE
Confidentiality (C):	PARTIAL
Integrity (I):	PARTIAL
Availability (A):	PARTIAL
Additional information:

Mend.io Vulnerability Database

We found results for “”

CVE-2021-29921

Date: May 5, 2021

Language: PHP

Severity Score

Related Resources (22)

Severity Score

Weakness Type (CWE)

CVSS v3.1

CVSS v2

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