What is CVE-2019-9946?

CVE-2019-9946 is a high-severity vulnerability in Cncf Portmap, classified under Always-Incorrect Control Flow Implementation. CVSS score: 7.5/10. Published 2019-04-02.

How severe is CVE-2019-9946?

High severity. CVSS v3 base score is 7.5 out of 10.

Is CVE-2019-9946 known to be exploited?

9 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

Vulnerability in Cncf Portmap

CVE-2019-9946

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.

Published 2019-04-02 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N.

EPSS exploit prediction

EPSS: 0.032 (87.9th percentile), scored 2026-10-28.

Low probability of exploitation in the next 30 days, but still tracked. 88th percentile — 87.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.032 · newest: 0.032 · change: 0.000

Affected products

Cncf Portmap
Kubernetes — versions 1.13.6, 1.14.0
NetApp Cloud Insights

Weakness classification (CWE)

CWE-670 — Always-Incorrect Control Flow Implementation

Public proof-of-concept exploits

References

github.com/containernetworking/plugins/pull/269 (Patch, Third Party Advisory)
security.netapp.com/advisory/ntap-20190416-0002/ (Patch, Third Party Advisory)
access.redhat.com/errata/RHBA-2019:0862 (vendor-advisory)
lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/… (vendor-advisory)
lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/… (vendor-advisory)

Frequently asked questions

What is CVE-2019-9946?: CVE-2019-9946 is a high-severity vulnerability in Cncf Portmap, classified under Always-Incorrect Control Flow Implementation. CVSS score: 7.5/10. Published 2019-04-02.
How severe is CVE-2019-9946?: High severity. CVSS v3 base score is 7.5 out of 10.
Is CVE-2019-9946 known to be exploited?: 9 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.