# CVE-2021-47154: libnet-cidr-lite-perl: The Net::CIDR::Lite module before 0.22 for Perl does not properly consider extraneous zero characters at the beginnin...

CVE-2021-47154 is fixed in libnet-cidr-lite-perl on 1 platform, first by libnet-cidr-lite-perl 0.21-2ubuntu0.1, released March 17, 2024. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2021-47154
- Priority: Routine
- CVSS: 6.3 (medium)
- EPSS: 0.0049
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Mar 17, 2024

## Description

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.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | libnet-cidr-lite-perl Debian 12.15 (bookworm) | 0.22-1 | [DEBIAN-CVE-2021-47154](https://patchblox.com/security/data/fix/linux/debian-cve-2021-47154.md) | Mar 18, 2024 |
| Linux | libnet-cidr-lite-perl Debian 13.5 (trixie) | 0.22-1 | [DEBIAN-CVE-2021-47154](https://patchblox.com/security/data/fix/linux/debian-cve-2021-47154.md) | Mar 18, 2024 |
| Linux | libnet-cidr-lite-perl Debian 14 | 0.22-1 | [DEBIAN-CVE-2021-47154](https://patchblox.com/security/data/fix/linux/debian-cve-2021-47154.md) | Mar 18, 2024 |
| Linux | libnet-cidr-lite-perl Ubuntu 18.04.6 LTS (bionic) | 0.21-1ubuntu0.18.04.1~esm1 | [libnet-cidr-lite-perl 0.21-1ubuntu0.18.04.1~esm1](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-libnet-cidr-lite-perl-0.21-1ubuntu0.18.04.1-esm1.md) | Apr 10, 2026 |
| Linux | libnet-cidr-lite-perl Ubuntu 20.04 LTS (focal) | 0.21-2ubuntu0.1 | [libnet-cidr-lite-perl 0.21-2ubuntu0.1](https://patchblox.com/security/data/fix/linux/ubuntu-focal-libnet-cidr-lite-perl-0.21-2ubuntu0.1.md) | Mar 17, 2024 |

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