# CVE-2025-40911: libnet-cidr-set-perl: Net::CIDR::Set versions 0.10 through 0.13 for Perl does not properly handle leading zero characters in IP CIDR addres...

CVE-2025-40911 is fixed in libnet-cidr-set-perl on 1 platform, first by DEBIAN-CVE-2025-40911, released May 27, 2025. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2025-40911
- Priority: Routine
- CVSS: 6.5 (medium)
- EPSS: 0.0038
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: May 27, 2025

## Description

Net::CIDR::Set versions 0.10 through 0.13 for Perl does not properly handle leading zero characters in IP CIDR address strings, which could allow attackers to bypass access control that is based on IP addresses.  Leading zeros are used to indicate octal numbers, which can confuse users who are intentionally using octal notation, as well as users who believe they are using decimal notation.  Net::CIDR::Set used code from Net::CIDR::Lite, which had a similar vulnerability CVE-2021-47154.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | libnet-cidr-set-perl Debian 13.5 (trixie) | 0.15-1 | [DEBIAN-CVE-2025-40911](https://patchblox.com/security/data/fix/linux/debian-cve-2025-40911.md) | May 27, 2025 |
| Linux | libnet-cidr-set-perl Debian 14 | 0.15-1 | [DEBIAN-CVE-2025-40911](https://patchblox.com/security/data/fix/linux/debian-cve-2025-40911.md) | May 27, 2025 |

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