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 update: 2024-11-21 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2019-9946 is rated Moderate Risk (50.2/100): CVSS High severity, with medium exploitation likelihood (EPSS 0.36%). Review affected assets and schedule remediation.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2019-9946

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-05-29 0.55% 0.36% -0.19%
2 2026-03-17 0.19% 0.55% +0.36%
3 2026-03-04 — 0.19% —

Full EPSS history (46 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2019-9946

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
7.5 3.0 HIGH
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:N)
Doesn’t really leak secrets in a meaningful way.
Integrity (I:H)
They could widely tamper with or forge data—trust in the data is badly hurt.
Availability (A:N)
Service keeps running; no real outage angle.
 3.9 3.6 [email protected]
5.0 2.0 MEDIUM
AV:N/AC:L/Au:N/C:N/I:P/A:N Click to expand
Access vector (AV:N)
Can be exploited remotely over network reachability.
Access complexity (AC:L)
Exploitation conditions are straightforward and predictable.
Authentication (AU:N)
No authentication is required.
Confidentiality impact (C:N)
No confidentiality impact.
Integrity impact (I:P)
Partial integrity impact.
Availability impact (A:N)
No availability impact.
 10.0 2.9 [email protected]

Weakness enumeration for CVE-2019-9946

OS Trackers for CVE-2019-9946

vendor priority summary link
alpine high CVE-2019-9946: 1 source package rows (containerd); 7 state rows across 7 repos (3.17-community, 3.18-community, 3.19-community, 3.20-community, 3.21-community, 3.22-community, edge-community); fixed 7, open 0. https://security.alpinelinux.org/vuln/CVE-2019-9946
debian unimportant CVE-2019-9946 unimportant priority: Debian including 2 source packages (golang-github-containernetworking-plugins, kubernetes), 10 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 10. https://security-tracker.debian.org/tracker/CVE-2019-9946
redhat medium — https://access.redhat.com/security/cve/CVE-2019-9946
suse medium CVE-2019-9946 severity moderate: SUSE including 26 source package names (buildah-1.9.0-5.module+el8.1.0+4240+893c1ab8, buildah-tests-1.9.0-5.module+el8.1.0+4240+893c1ab8, …), 34 product×package rows across 8 product lines (Magnum Orchestration 7, SUSE CaaS Platform 4.0, … (8 product lines)): Fixed 21, Known Not Affected 13. https://www.suse.com/security/cve/CVE-2019-9946/
ubuntu medium CVE-2019-9946 medium priority: Ubuntu including 1 source packages (kubernetes), 18 status rows across 18 suites (bionic, cosmic, disco, eoan, focal, groovy, hirsute, impish, jammy, kinetic, lunar, mantic, noble, oracular, plucky, trusty, upstream, xenial): ignored 10, DNE 4, not-affected 3, needs-triage 1. https://ubuntu.com/security/CVE-2019-9946

Affected software / configurations for CVE-2019-9946

Vendor Product Version Raw CPE
cncf portmap < 0.7.5 cpe:2.3:a:cncf:portmap:*:*:*:*:*:container_networking_interface:*:*
kubernetes kubernetes < 1.11.9 cpe:2.3:a:kubernetes:kubernetes:*:*:*:*:*:*:*:*
kubernetes kubernetes >= 1.12.0, < 1.12.7 cpe:2.3:a:kubernetes:kubernetes:*:*:*:*:*:*:*:*
kubernetes kubernetes >= 1.13.0, < 1.13.5 cpe:2.3:a:kubernetes:kubernetes:*:*:*:*:*:*:*:*
kubernetes kubernetes 1.13.6 cpe:2.3:a:kubernetes:kubernetes:1.13.6:beta0:*:*:*:*:*:*
kubernetes kubernetes 1.14.0 cpe:2.3:a:kubernetes:kubernetes:1.14.0:alpha0:*:*:*:*:*:*
kubernetes kubernetes 1.14.0 cpe:2.3:a:kubernetes:kubernetes:1.14.0:alpha1:*:*:*:*:*:*
kubernetes kubernetes 1.14.0 cpe:2.3:a:kubernetes:kubernetes:1.14.0:alpha2:*:*:*:*:*:*
kubernetes kubernetes 1.14.0 cpe:2.3:a:kubernetes:kubernetes:1.14.0:alpha3:*:*:*:*:*:*
kubernetes kubernetes 1.14.0 cpe:2.3:a:kubernetes:kubernetes:1.14.0:beta0:*:*:*:*:*:*
kubernetes kubernetes 1.14.0 cpe:2.3:a:kubernetes:kubernetes:1.14.0:beta1:*:*:*:*:*:*
kubernetes kubernetes 1.14.0 cpe:2.3:a:kubernetes:kubernetes:1.14.0:beta2:*:*:*:*:*:*
kubernetes kubernetes 1.14.0 cpe:2.3:a:kubernetes:kubernetes:1.14.0:rc1:*:*:*:*:*:*
netapp cloud_insights — cpe:2.3:a:netapp:cloud_insights:-:*:*:*:*:*:*:*

References for CVE-2019-9946

cvelogic Threat Intelligence