Skip to content
Fencer Vulns
medium 6.3

CVE-2021-47154 json

The Net::CIDR::Lite module before 0.22 for Perl does not properly consider extraneous zero characters at the beginning of an IP address str…

published 2024-03-18 2 y ago modified 2026-06-17 4 mo ago also EUVD-2021-33802

cvss
6.3
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.5%
EPSS 0.5% chance of exploitation in 30 days, percentile 42%
public exploits
0
none known

Summary

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.

Patch / fix

  • libnet-cidr-lite-perl Debian 14, Debian 13, Debian 12 0.22-1

debian advisories DEBIAN-CVE-2021-47154

  • libnet-cidr-lite-perl Ubuntu 20.04 LTS 0.21-2ubuntu0.1
  • libnet-cidr-lite-perl Ubuntu Pro 16.04 LTS 0.21-1ubuntu0.16.04.1~esm1
  • libnet-cidr-lite-perl Ubuntu Pro 18.04 LTS 0.21-1ubuntu0.18.04.1~esm1

ubuntu advisories UBUNTU-CVE-2021-47154

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • perl-Net-CIDR-Lite SLE Module for Development Tools 15 SP5, openSUSE Leap 15.5 0.21-150100.6.3.1

suse advisories SUSE-SU-2024:1256-1

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2021-47154 updated cvss 6.3

Perl-Net-CIDR-Lite: improper handling of extraneous zero characters in an IP address string

  • Red Hat Enterprise Linux 9 perl-Net-CIDR-Lite
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
partial
Assessed
2 y ago

Exploit prediction

0.49% chance of exploitation in the next 30 days, higher than 42% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CISA ADP 3.1 6.3 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:L
CNA 3.1 6.3 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:L

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.