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CVE-2021-4456

25
FAUCET Score

CVE-2021-4456 affects the Net::CIDR Perl module versions

Impacted Technologies

VendorProductVersion(s)CPE
< 0.24CPE matchmatch criteria
cpe:2.3:a:mrsam:net\:\:cidr:*:*:*:*:*:perl:*:*
>= 0, < 0.24CPE match
cpe:2.3:a:mrsam:net\:\:cidr:*:*:*:*:*:perl:*:*

CVSS Data

CVSS version used by this source: 3.1

6.5MEDIUM

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
LOW
Integrity Impact
LOW
Availability Impact
NONE
Exploitability Score
3.9
Impact Score
2.5
CvssVersion
3.1

Exploit Intelligence

EPSS Score
0.32%
Probability of exploitation in next 30 days
EPSS Percentile
24.6%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0032 is in the 14th percentile among its peer group of 23,705 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.0 Mastodon, and 0.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.0 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (2)

hashicorppatch availablevia llm_extracted
View patch
puppetpatch availablevia llm_extracted
View patch

Vendor Advisories (2)

puppetllm-puppet-24528a650597b362

USN-8110-1: Net-CIDR vulnerability

Mar 18, 2026
hashicorpllm-hashicorp-b7ded11bbc348309

USN-8110-1: Net-CIDR vulnerability

Mar 18, 2026

References

blog.urth.org / 2021/03/29/security-issues-in-perl-ip-address-distros
Third Party Advisory
github.com / svarshavchik/Net-CIDR/commit/e3648c6bc6bdd018f90cca4149c467017d42bd10
Patch
metacpan.org / dist/Net-CIDR/changes
Release Notes