The Net::CIDR::Lite module before 0.22 for Perl does not properly consider extraneous zero characters at the beginning of an IP address string, which (in some situations) allows attackers to bypass access control that is based on IP addresses.

The remote Ubuntu 16.04 LTS / 18.04 LTS / 20.04 LTS / 22.04 LTS / 24.04 LTS / 25.10 / 26.04 LTS host has a package installed that is affected by multiple vulnerabilities as referenced in the USN-8406-1 advisory.

    Dave Rolsky discovered that Net::CIDR::Lite did not properly handle extraneous zero characters at the     beginning of an IP address string. A remote attacker could possibly use this issue to bypass access     controls that are based on IP addresses. This issue only affected Ubuntu 16.04 LTS and Ubuntu 18.04 LTS.
    (CVE-2021-47154)

    It was discovered that Net::CIDR::Lite did not properly validate the IPv6 group count when handling     uncompressed IPv6 addresses. A remote attacker could possibly use this issue to bypass access controls.
    (CVE-2026-40198)

    It was discovered that Net::CIDR::Lite mishandled IPv4 mapped IPv6 addresses. A remote attacker could     possibly use this issue to bypass access controls that are based on IP addresses. (CVE-2026-40199)

Tenable has extracted the preceding description block directly from the Ubuntu security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The Unity Linux 20 host has a package installed that is affected by a vulnerability as referenced in the UTSA-2026-016598 advisory.

    The Net::CIDR::Lite module before 0.22 for Perl does not properly consider extraneous zero characters at     the beginning of an IP address string, which (in some situations) allows attackers to bypass access     control that is based on IP addresses.

Tenable has extracted the preceding description block directly from the Unity Linux security advisory.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

The remote SUSE Linux SLED15 / SLED_SAP15 / SLES15 / SLES_SAP15 / openSUSE 15 host has a package installed that is affected by a vulnerability as referenced in the SUSE-SU-2024:1256-1 advisory.

  - The Net::CIDR::Lite module before 0.22 for Perl does not properly consider extraneous zero characters at     the beginning of an IP address string, which (in some situations) allows attackers to bypass access     control that is based on IP addresses. (CVE-2021-47154)

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

The remote Debian 10 host has a package installed that is affected by a vulnerability as referenced in the dla-3770 advisory.

    - -------------------------------------------------------------------------     Debian LTS Advisory DLA-3770-1                debian-lts@lists.debian.org     https://www.debian.org/lts/security/                    Thorsten Alteholz     March 23, 2024                                https://wiki.debian.org/LTS
    - -------------------------------------------------------------------------

    Package        : libnet-cidr-lite-perl     Version        : 0.21-2+debu10u1     CVE ID         : CVE-2021-47154


    An issue has been found in libnet-cidr-lite-perl, a module for merging     IPv4 or IPv6 CIDR address ranges.


    Extraneous zero characters at the beginning of an IP address string     might allow attackers to bypass access control that is based on IP     addresses.


    Please check your application whether it accidentally allows such leading     zero characters (that are normally meant to indicate octal numbers).



    For Debian 10 buster, this problem has been fixed in version     0.21-2+debu10u1.

    We recommend that you upgrade your libnet-cidr-lite-perl packages.

    For the detailed security status of libnet-cidr-lite-perl please refer to     its security tracker page at:
    https://security-tracker.debian.org/tracker/libnet-cidr-lite-perl

    Further information about Debian LTS security advisories, how to apply     these updates to your system and frequently asked questions can be     found at: https://wiki.debian.org/LTS

Tenable has extracted the preceding description block directly from the Debian security advisory.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

The remote Ubuntu 20.04 LTS host has a package installed that is affected by a vulnerability as referenced in the USN-6712-1 advisory.

    It was discovered that Net::CIDR::Lite incorrectly handled extra zero characters at the beginning of IP     address strings. A remote attacker could possibly use this issue to bypass access controls.

Tenable has extracted the preceding description block directly from the Ubuntu security advisory.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

ID	Name	Product	Family	Severity
320398	Ubuntu 16.04 LTS / 18.04 LTS / 20.04 LTS / 22.04 LTS / 24.04 LTS / 25.10 / 26.04 LTS : Net::CIDR::Lite vulnerabilities (USN-8406-1)	Nessus	Ubuntu Local Security Checks	high
316171	Unity Linux 20.1050e / 20.1070e Security Update: perl-Net-CIDR-Lite (UTSA-2026-016598)	Nessus	Unity Linux Local Security Checks	medium
193300	SUSE SLED15 / SLES15 / openSUSE 15 Security Update : perl-Net-CIDR-Lite (SUSE-SU-2024:1256-1)	Nessus	SuSE Local Security Checks	medium
192977	Debian dla-3770 : libnet-cidr-lite-perl - security update	Nessus	Debian Local Security Checks	medium
192533	Ubuntu 20.04 LTS : Net::CIDR::Lite vulnerability (USN-6712-1)	Nessus	Ubuntu Local Security Checks	medium

Detections

Analytics

CVE-2021-47154

medium

Tenable Plugins

high

medium

medium

medium

medium