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Fencer Vulns
high 7.5

CVE-2021-29662 json

The Data::Validate::IP module through 0.29 for Perl does not properly consider extraneous zero characters at the beginning of an IP address…

published 2021-03-31 5 y ago modified 2026-06-17 4 mo ago also EUVD-2021-16136

cvss
7.5
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
2.2%
EPSS 2.2% chance of exploitation in 30 days, percentile 82%
public exploits
0
none known

Summary

The Data::Validate::IP module through 0.29 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

  • libdata-validate-ip-perl Debian 14, Debian 13, Debian 12 0.30-1

debian advisories DEBIAN-CVE-2021-29662

Exploit prediction

2.22% chance of exploitation in the next 30 days, higher than 82% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • blog.urth.org https://blog.urth.org/2021/03/29/security-issues-in-perl-ip-address-distros/ referenced PoC, tagged "exploit" by a source, unverified
  • sick.codes https://sick.codes/sick-2021-018/ referenced PoC, tagged "exploit" by a source, unverified
  • github.com https://github.com/sickcodes/security/blob/master/advisories/SICK-2021-018.md referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
NVD 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
NVD 2.0 5.0 AV:N/AC:L/Au:N/C:N/I:P/A:N

Classification

Weakness
  • CWE-704 Incorrect Type Conversion or Cast

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.