HOMEVULNERABILITIESCVE-2019-9946
HIGH

CVE-2019-9946

CWE-670Published: April 2, 2019· Updated: Jun 17, 2026

7.5
CVSS v3.1

Official 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.

NVD Source

Technical Analysis

CVE-2019-9946 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in full integrity compromise (data manipulation), with a CVSS base score of 7.5.

CVSS v3.1 Vector Breakdown

Exploitability
Attack VectorNetwork
Attack ComplexityLow
Privileges Req.None
User InteractionNone
ScopeUnchanged
Impact
ConfidentialityNone
IntegrityHigh
AvailabilityNone
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

Affected Vendors & Products

cncf1 product(s)
portmap
Kubernetes1 product(s)
kubernetes
netapp1 product(s)
cloud insights
Source: NVD CPE · 5 total CPE entries

Exploit & PoC Resources

NO KNOWN EXPLOITNo public exploit confirmed at this time
Exploit-DB
Offensive Security exploit database
GitHub PoC Search
Community PoC repositories
Rapid7 / Metasploit
Metasploit module search
PacketStorm
Security advisories & exploits
NVD Detail
Official NIST entry
MITRE CVE
CVE Program entry
External links open in a new tab. Always verify in a controlled environment before use.

Official Patches & Advisories

PATCHhttps://github.com/containernetworking/plugins/pull/269#issuecomment-477683272
PATCHhttps://security.netapp.com/advisory/ntap-20190416-0002/
PATCHhttps://github.com/containernetworking/plugins/pull/269#issuecomment-477683272
PATCHhttps://security.netapp.com/advisory/ntap-20190416-0002/

All References (10)

→
https://access.redhat.com/errata/RHBA-2019:0862
→
https://github.com/containernetworking/plugins/pull/269#issuecomment-477683272Patch · Third Party Advisory
→
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/
→
https://security.netapp.com/advisory/ntap-20190416-0002/Patch · Third Party Advisory
→
https://access.redhat.com/errata/RHBA-2019:0862
→
https://github.com/containernetworking/plugins/pull/269#issuecomment-477683272Patch · Third Party Advisory
→
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/
→
https://security.netapp.com/advisory/ntap-20190416-0002/Patch · Third Party Advisory

Quick Facts

CVE IDCVE-2019-9946
CVSS Score7.5 / 10
SeverityHIGH
WeaknessCWE-670
CISA KEVNo
Affected3 vendor(s)
PublishedApr 2, 2019

Related CVEs (CWE-670)

CVE-2020-1914
9.8
CVE-2021-41153
9.8
CVE-2019-17192
9.8
CVE-2023-23623
9.8
CVE-2022-25745
9.8
CVE-2022-21679
9.8

Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2019-9946 in threat intel feeds
  • →Review IDS/IPS signatures for exploitation attempts
Data sourced from NVD (NIST), CISA KEV, and EPSS (FIRST). Analysis generated by CTIWatch. CVE data is provided under the NVD usage policy.
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