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Fencer Vulns
high 7.5

CVE-2019-9946 json

Cloud Native Computing Foundation (CNCF) CNI (Container Networking Interface) 0.7.4 has a network firewall misconfiguration which affects K…

published 2019-04-02 7 y ago modified 2026-06-17 4 mo ago also EUVD-2019-19300

cvss
7.5
version 3.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
3.2%
EPSS 3.2% chance of exploitation in 30 days, percentile 88%
public exploits
0
none known

Summary

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.

Patch / fix

  • cncf portmap 0.7.5
  • kubernetes kubernetes 1.11.9, 1.12.7, 1.13.5
  • kubernetes Debian 14, Debian 13, Debian 12 1.17.4-1

debian advisories DEBIAN-CVE-2019-9946

  • runc RHEL 8 1.0.0-60.rc8.module+el8.1.0+4081+b29780af
  • podman RHEL 8 1.4.2-5.module+el8.1.0+4240+893c1ab8
  • skopeo RHEL 8 1:0.1.37-5.module+el8.1.0+4240+893c1ab8
  • buildah RHEL 8 1.9.0-5.module+el8.1.0+4240+893c1ab8
  • toolbox RHEL 8 0.0.4-1.module+el8.1.0+4081+b29780af
  • oci-umount RHEL 8 2:2.3.4-2.git87f9237.module+el8.1.0+4081+b29780af
  • slirp4netns RHEL 8 0.3.0-4.module+el8.1.0+4306+1d917805
  • podman-tests RHEL 8 1.4.2-5.module+el8.1.0+4240+893c1ab8

red hat advisories RHSA-2019:3403RHBA-2019:0862

  • k3s openSUSE Tumbleweed 1.21.3+k3s1-1.2

opensuse advisories openSUSE-SU-2024:10884-1

  • oci-umount AlmaLinux 8 2:2.3.4-2.git87f9237.module_el8.5.0+119+9a9ec082
  • oci-umount AlmaLinux 8 2:2.3.4-2.git87f9237.module_el8.4.0+2496+12421f43
  • oci-umount AlmaLinux 8 2:2.3.4-2.git87f9237.module_el8.3.0+2044+12421f43
  • oci-systemd-hook AlmaLinux 8 1:0.1.15-2.git2d0b8a3.module_el8.5.0+119+9a9ec082
  • oci-systemd-hook AlmaLinux 8 1:0.1.15-2.git2d0b8a3.module_el8.4.0+2496+12421f43
  • oci-systemd-hook AlmaLinux 8 1:0.1.15-2.git2d0b8a3.module_el8.3.0+2044+12421f43

almalinux advisories ALSA-2019:3403

  • oci-umount Rocky Linux 8 2:2.3.4-2.git87f9237.module+el8.4.0+557+48ba8b2f
  • oci-systemd-hook Rocky Linux 8 1:0.1.15-2.git2d0b8a3.module+el8.4.0+557+48ba8b2f

rocky linux advisories RLSA-2019:3403

  • containerd Alpine 3.24, Alpine 3.23, Alpine 3.22 +12 more 1.2.6-r0
  • containerd Alpine 3.9 1.2.6

alpine advisories ALPINE-CVE-2019-9946

Alpine secdb © Alpine Linux, from https://secdb.alpinelinux.org via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2019-9946 updated cvss 6.5

kubernetes: Incorrect rule injection in CNI portmap plugin

  • Red Hat Enterprise Linux 8 containernetworking-plugins
    affected: no fix planned “Out of support scope”
  • Red Hat Enterprise Linux 7 Extras containernetworking-plugins 0.7.5-2.el7
    fixed: vendor fix RHBA-2019:0862
  • Red Hat Enterprise Linux AppStream (v. 8) podman 1.4.2-5.module+el8.1.0+4240+893c1ab8, buildah 1.9.0-5.module+el8.1.0+4240+893c1ab8, skopeo 0.1.37-5.module+el8.1.0+4240+893c1ab8, toolbox 0.0.4-1.module+el8.1.0+4081+b29780af, runc 1.0.0-60.rc8.module+el8.1.0+4081+b29780af, cockpit-podman 4-1.module+el8.1.0+4081+b29780af, +14 more
    fixed: vendor fix RHSA-2019:3403
  • Red Hat OpenShift Container Platform 3.4 atomic-openshift, atomic-openshift-pod, atomic-openshift-node, atomic-openshift-tests, atomic-openshift-master, atomic-openshift-clients, +6 more Red Hat OpenShift Container Platform 3.5 atomic-openshift, atomic-openshift-pod, atomic-openshift-node, atomic-openshift-tests, atomic-openshift-master, atomic-openshift-clients, +6 more Red Hat OpenShift Container Platform 3.6 atomic-openshift, atomic-openshift-pod, atomic-openshift-node, atomic-openshift-tests, atomic-openshift-master, atomic-openshift-clients, +9 more Red Hat OpenShift Container Platform 3.7 atomic-openshift, atomic-openshift-pod, atomic-openshift-node, atomic-openshift-tests, atomic-openshift-master, atomic-openshift-clients, +10 more Red Hat OpenShift Container Platform 3.9 atomic-openshift, atomic-openshift-pod, atomic-openshift-node, atomic-openshift-tests, atomic-openshift-master, atomic-openshift-clients, +8 more Red Hat OpenShift Container Platform 3.10 atomic-openshift, atomic-openshift-pod, atomic-openshift-node, atomic-openshift-tests, atomic-openshift-master, atomic-openshift-clients, +7 more
    +3 more products
    Red Hat OpenShift Container Platform 3.11 atomic-openshift, atomic-openshift-pod, atomic-openshift-node, atomic-openshift-tests, atomic-openshift-master, atomic-openshift-clients, +7 more Red Hat OpenShift Container Platform 4 openshift, openshift-clients, openshift-kubelet, openshift-hyperkube, openshift-kube-apiserver, openshift-kube-scheduler, +2 more Red Hat Storage 3 heketi, heketi-client, python-heketi
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

3.16% chance of exploitation in the next 30 days, higher than 88% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
NVD 3.0 7.5 CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
NVD 2.0 5.0 AV:N/AC:L/Au:N/C:N/I:P/A:N

Classification

Weakness
  • CWE-670 Always-Incorrect Control Flow Implementation
Technology feeds

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.