CVE-2025-40911 Security feature bypass in Net::CIDR::Set
Attackers can bypass IP-based access controls by using leading zeros in CIDR strings, affecting Perl applications using Net::CIDR::Set.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2025-40911?
CVE-2025-40911 is a medium-severity vulnerability in RRWO Net::CIDR::Set, published on 27 May 2025. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
Net::CIDR::Set versions 0.10 through 0.13 for Perl does not properly handle leading zero characters in IP CIDR address strings, which could allow attackers to bypass access control that is based on IP addresses.
Leading zeros are used to indicate octal numbers, which can confuse users who are intentionally using octal notation, as well as users who believe they are using decimal notation.
Net::CIDR::Set used code from Net::CIDR::Lite, which had a similar vulnerability CVE-2021-47154.
Weakness: CWE-1287
Which versions are affected by CVE-2025-40911?
How do I fix CVE-2025-40911?
Apply the vendor's patch.
Is CVE-2025-40911 being exploited?
There is no known exploitation of CVE-2025-40911 in the wild and no public exploit code.
Sources
Also known as DEBIAN-CVE-2025-40911, GHSA-p745-hrr6-rg8c, UBUNTU-CVE-2025-40911.