Vulnerability · Published Mar 18, 2024 · Assigned by mitre
CVE-2021-47155
Critical 9.1
In plain English
A critical-severity improper access control in the libnetwork-ipv4addr-perl package (Debian). Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.5% (higher than 43% of all known vulnerabilities).
Severity (CVSS 3.1)9.1Critical
Exploit odds (30 days)0.5%top 56.6% of all CVEs
Exploited in the wildNo reportsCISA SSVC: poc
Attack toolingNoneno public tooling known
Official description
The Net::IPV4Addr module 0.10 for Perl does not properly consider extraneous zero characters in an IP address string, which (in some situations) allows attackers to bypass access control that is based on IP addresses.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:12 | libnetwork-ipv4addr-perl | no fix listed | DEBIAN-CVE-2021-47155 |
| Debian:13 | libnetwork-ipv4addr-perl | no fix listed | DEBIAN-CVE-2021-47155 |
| Debian:14 | libnetwork-ipv4addr-perl | no fix listed | DEBIAN-CVE-2021-47155 |
| Ubuntu:22.04:LTS | libnetwork-ipv4addr-perl | no fix listed | UBUNTU-CVE-2021-47155 |
| Ubuntu:24.04:LTS | libnetwork-ipv4addr-perl | no fix listed | UBUNTU-CVE-2021-47155 |
| Ubuntu:25.10 | libnetwork-ipv4addr-perl | no fix listed | UBUNTU-CVE-2021-47155 |
| Ubuntu:26.04:LTS | libnetwork-ipv4addr-perl | no fix listed | UBUNTU-CVE-2021-47155 |
| Ubuntu:26.10 | libnetwork-ipv4addr-perl | no fix listed | UBUNTU-CVE-2021-47155 |
Affected products (as reported)
Weakness: CWE-284 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N