CVE-2021-29424

unknown

Published — · Modified —

CVSS v3

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CVSS v2

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VIR risk

—

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.

Predictions

Exploit likelihood

20%

Patch ETA

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Heuristic predictions, AS-IS, for prioritization only.

Mitigations

vendor Authored 2026-05-27

Vendor advisory: debian — https://security-tracker.debian.org/tracker/CVE-2021-29424

vendor Authored 2026-05-27

Vendor advisory: suse — https://www.suse.com/security/cve/CVE-2021-29424.html

OS impact

OS	Version	Status	Fixed in
sles		affected
debian	bookworm	fixed	`1.9104-2`
debian	bullseye	fixed	`1.9104-2`
debian	forky	fixed	`1.9104-2`
debian	sid	fixed	`1.9104-2`
debian	trixie	fixed	`1.9104-2`

References

https://www.suse.com/security/cve/CVE-2021-29424.html
https://security-tracker.debian.org/tracker/CVE-2021-29424

Verify integrity in audit chain (admin only). AS-IS.