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No exploitation reportedFix available

CVE-2021-29424

No exploitation reported by the sources we read.

  • Published2021-04-06
  • WeaknessCWE-704

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

Description

The Net::Netmask module before 2.0000 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.

Timeline

dates in UTC
  1. 2021-04-0616:15CVE publishedNVD

Versions per branch

NVD
Fedoraproject fedora
BranchAffectedFixed in
32.x= 32no fix published
33.x= 33no fix published
34.x= 34no fix published
Net\ \
BranchAffectedFixed in
—= netmask_projectno fix published

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Distribution builds and vendor advisories

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Packages

  • libnet-netmask-perlUbuntu:20.04:LTSall versions · no fixed version listedand 1 other package
  • libnet-netmask-perlUbuntu:18.04:LTSall versions · no fixed version listedand 1 other package
  • libnet-netmask-perlUbuntu:16.04:LTSall versions · no fixed version listedand 1 other package
  • libnet-netmask-perlDebian:14all versions · fixed in 1.9104-2
  • libnet-netmask-perlDebian:13all versions · fixed in 1.9104-2
  • libnet-netmask-perlDebian:12all versions · fixed in 1.9104-2
  • libnetwork-ipv4addr-perlUbuntu:26.10all versions · no fixed version listed
  • libnetwork-ipv4addr-perlUbuntu:26.04:LTSall versions · no fixed version listed

10 more package ranges on OSV.dev

Vendor advisories

  • CVE-2021-29424 Red Hat Product Security

    perl-Net-Netmask: incorrectly parses an IP address with leading zeros in IP octets

Full record on NVD

Fix

Advisories and patches

Detection

Nuclei template
none so far
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Proof of concept
Metasploit modules
none listed
Metasploit Framework

Sources

Identifiers

Technical details

CVSS v3 Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
Published
2021-04-06
Last Modified
2026-06-17
NVD status
Modified
GitHub Advisory
GHSA-p75p-x3j9-7vj3

Frequently asked questions

What is CVE-2021-29424?

The Net::Netmask module before 2.0000 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.

Is CVE-2021-29424 actively exploited?

Active exploitation of CVE-2021-29424 has not been confirmed. Its EPSS score was 1.8% on 2026-11-08, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2021-29424?

CVE-2021-29424 has a CVSS v3 base score of 7.5 (HIGH severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N.

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