Information disclosure in Containernetworking Plugins
CVE-2025-67499
The CNI portmap plugin allows containers to emulate opening a host port, forwarding that traffic to the container. Versions 1.6.0 through 1.8.0 inadvertently forward all traffic with the same destination port as the host port when the portmap plugin is configured with the nftables backend, thus ignoring the destination IP. This includes traffic not intended for the node itself, i.e. traffic to containers hosted on the node. Containers that request HostPort forwarding can intercept all traffic destined for that port. This requires that the portmap plugin be explicitly configured to use the nftables backend. This issue is fixed in version 1.9.0. To workaround, configure the portmap plugin to use the iptables backend. It does not have this vulnerability.
Vulnerability class: Information Disclosure
EPSS: 0.001 (2.5th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 6.6 (Medium). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:H.
Affected products
- Containernetworking Plugins — versions >= 1.6.0, < 1.9.0
- Linuxfoundation Cni_network_plugins
Weakness classification (CWE)
References
- security-advisories@github.com (x_refsource_CONFIRM, Vendor Advisory)
- security-advisories@github.com (Patch, x_refsource_MISC, Issue Tracking)
- security-advisories@github.com (Product, x_refsource_MISC, Release Notes)
Frequently asked questions
- What is CVE-2025-67499?
- CVE-2025-67499 is a medium-severity vulnerability in Containernetworking Plugins, classified under Information Disclosure. CVSS score: 6.6/10. Published 2025-12-10.
- How severe is CVE-2025-67499?
- Medium severity. CVSS v3 base score is 6.6 out of 10.