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Ubuntu 24.04 Net-CIDR Important Network Access Control Issue USN-8110-1

ubuntu
Calendar Grey March 23, 2026
Dist Ubuntu Esm H88
Net-CIDR vulnerability in Ubuntu could allow unauthorized network access. Update to protect your services.
Net-CIDR could allow unintended access to network services.

Summary

Net-CIDR could allow unintended access to network services.

Software Description:

- libnet-cidr-perl: module for merging IPv4 or IPv6 CIDR address ranges

Details:

Dave Rolsky discovered that Net-CIDR did not properly sanitize IP

addresses. An attacker could possibly use this to bypass IP-based

restrictions.

Topics%20covered

Topics Covered

security advisory access control Ubuntu important net-cidr ip sanitization

Update Instructions

The problem can be corrected by updating your system to the following
package versions:

Ubuntu 24.04 LTS
  libnet-cidr-perl                0.21-2ubuntu0.2

Ubuntu 22.04 LTS
  libnet-cidr-perl                0.21-1ubuntu0.2

Ubuntu 20.04 LTS
  libnet-cidr-perl                0.20-1ubuntu0.1~esm2
                                  Available with Ubuntu Pro

Ubuntu 18.04 LTS
  libnet-cidr-perl                0.18-1ubuntu0.1~esm2
                                  Available with Ubuntu Pro

Ubuntu 16.04 LTS
  libnet-cidr-perl                0.17-1ubuntu0.16.04.1~esm2
                                  Available with Ubuntu Pro

Ubuntu 14.04 LTS
  libnet-cidr-perl                0.17-1ubuntu0.14.04.1~esm2
                                  Available with Ubuntu Pro

In general, a standard system update will make all the necessary changes.

References

https://ubuntu.com/security/notices/USN-8110-1

CVE-2021-4456

Severity
important
Lowest
Low
Medium
High
Critical

Ubuntu Security Notice USN-8110-1

Topics%20covered

Topics Covered

security advisory access control Ubuntu important net-cidr ip sanitization

Package Information

https://launchpad.net/ubuntu/+source/libnet-cidr-perl/0.21-2ubuntu0.2
https://launchpad.net/ubuntu/+source/libnet-cidr-perl/0.21-1ubuntu0.2

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