Description
A vulnerability was found in all versions of containernetworking/plugins before version 0.8.6, that allows malicious containers in Kubernetes clusters to perform man-in-the-middle (MitM) attacks. A malicious container can exploit this flaw by sending rogue IPv6 router advertisements to the host or other containers, to redirect traffic to the malicious container.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| Red Hat | containernetworking/plugins | all containernetworking/plugins versions before version 0.8.6 | — |
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | golang-github-containernetworking-plugins | 0.8.6-1 | — |
| Debian 13 | golang-github-containernetworking-plugins | 0.8.6-1 | — |
| Debian 12 | golang-github-containernetworking-plugins | 0.8.6-1 | — |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 20.04 LTS | golang-github-containernetworking-plugins | No fix yet | — |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 8 | buildah +1 | 1.15.1-2.module+el8.3.0+8221+97165c3f | RHSA-2020:4694 |
| RHEL 8 | cockpit-podman | 18.1-2.module+el8.3.0+8221+97165c3f | RHSA-2020:4694 |
| RHEL 8 | conmon | 2:2.0.20-2.module+el8.3.0+8221+97165c3f | RHSA-2020:4694 |
| RHEL 8 | container-selinux | 2:2.144.0-1.module+el8.3.0+8221+97165c3f | RHSA-2020:4694 |
| RHEL 8 | containernetworking-plugins | 0.8.6-2.module+el8.3.0+8221+97165c3f | RHSA-2020:4694 |
| RHEL 8 | crit +2 | 3.14-2.module+el8.3.0+8221+97165c3f | RHSA-2020:4694 |
| RHEL 8 | crun | 0.14.1-2.module+el8.3.0+8221+97165c3f | RHSA-2020:4694 |
| RHEL 8 | fuse-overlayfs +1 | 1.1.2-3.module+el8.3.0+8221+97165c3f | RHSA-2020:4694 |
| RHEL 8 | libslirp +1 | 4.3.1-1.module+el8.3.0+8221+97165c3f | RHSA-2020:4694 |
| RHEL 8 | podman +4 | 2.0.5-5.module+el8.3.0+8221+97165c3f | RHSA-2020:4694 |
| RHEL 8 | python-podman-api | 1.2.0-0.2.gitd0a45fe.module+el8.3.0+8221+97165c3f | RHSA-2020:4694 |
| RHEL 8 | runc | 1.0.0-68.rc92.module+el8.3.0+8221+97165c3f | RHSA-2020:4694 |
| RHEL 8 | skopeo +2 | 1:1.1.1-3.module+el8.3.0+8221+97165c3f | RHSA-2020:4694 |
| RHEL 8 | slirp4netns | 1.1.4-2.module+el8.3.0+8221+97165c3f | RHSA-2020:4694 |
| RHEL 8 | toolbox | 0.0.8-1.module+el8.3.0+8221+97165c3f | RHSA-2020:4694 |
| RHEL 8 | udica | 0.2.2-1.module+el8.3.0+8221+97165c3f | RHSA-2020:4694 |
Show 2 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Red Hat Rhel Extras Other 7 | containernetworking-plugins | 0.8.3-3.el7_8 | RHSA-2020:2684 |
| Red Hat OpenShift 4 | containernetworking-plugins | 0.8.6-1.rhaos4.2.el7 | RHSA-2020:2592, RHSA-2020:2443, RHSA-2020:2403 |
AlmaLinux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| AlmaLinux 8 | libslirp +1 | 4.3.1-1.module_el8.6.0+2876+9ed4eae2 | ALSA-2020:4694 |
| AlmaLinux 8 | python-podman-api | 1.2.0-0.2.gitd0a45fe.module_el8.5.0+108+00865455 | ALSA-2020:4694 |
Rocky Linux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Rocky Linux 8 | libslirp | 4.3.1-1.module+el8.4.0+556+40122d08 | RLSA-2020:4694 |
| Rocky Linux 8 | python-podman-api | 1.2.0-0.2.gitd0a45fe.module+el8.4.0+559+c02fa3b2 | RLSA-2020:4694 |
| Rocky Linux 8 | toolbox | 0.0.8-1.module+el8.4.0+556+40122d08 | RLSA-2020:4694 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 15 SP2 | cni-plugins | 0.8.6-3.6.1 | SUSE-SU-2020:1957-1 |
| SLES 15 SP1 | cni-plugins | 0.8.6-3.6.1 | SUSE-SU-2020:1957-1 |
| SLES 15 | cni-plugins | 0.8.6-150000.1.7.1 | SUSE-SU-2022:4151-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | cni-plugins | 0.9.1-1.3 | openSUSE-SU-2024:10689-1 |
| openSUSE Leap 15.2 | cni-plugins | 0.8.6-lp152.2.4.1 | openSUSE-SU-2020:1050-1 |
| openSUSE Leap 15.1 | cni-plugins | 0.8.6-lp151.2.6.1 | openSUSE-SU-2020:1049-1 |
Alpine
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.24 | k3s | 1.18.3.1-r0 | — |
| Alpine v3.23 | k3s | 1.18.3.1-r0 | — |
| Alpine v3.22 | k3s | 1.18.3.1-r0 | — |
| Alpine v3.21 | k3s | 1.18.3.1-r0 | — |
| Alpine v3.20 | k3s | 1.18.3.1-r0 | — |
Show 7 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.19 | k3s | 1.18.3.1-r0 | — |
| Alpine v3.18 | k3s | 1.18.3.1-r0 | — |
| Alpine v3.17 | k3s | 1.18.3.1-r0 | — |
| Alpine v3.16 | k3s | 1.18.3.1-r0 | — |
| Alpine v3.15 | k3s | 1.18.3.1-r0 | — |
| Alpine v3.14 | k3s | 1.18.3.1-r0 | — |
| Alpine v3.13 | k3s | 1.18.3.1-r0 | — |
Oracle Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Oracle Linux 8 | buildah +1 | 1.15.1-2.0.1.module+el8.3.0+7866+f387f528 | ELSA-2020-4694 |
| Oracle Linux 8 | cockpit-podman | 18.1-2.module+el8.3.0+7866+f387f528 | ELSA-2020-4694 |
| Oracle Linux 8 | conmon | 2:2.0.20-2.module+el8.3.0+7866+f387f528 | ELSA-2020-4694 |
| Oracle Linux 8 | container-selinux | 2:2.144.0-1.module+el8.3.0+7866+f387f528 | ELSA-2020-4694 |
| Oracle Linux 8 | containernetworking-plugins | 0.8.6-2.module+el8.3.0+7866+f387f528 | ELSA-2020-4694 |
| Oracle Linux 8 | crit +2 | 3.14-2.module+el8.3.0+7866+f387f528 | ELSA-2020-4694 |
| Oracle Linux 8 | crun | 0.14.1-2.module+el8.3.0+7866+f387f528 | ELSA-2020-4694 |
| Oracle Linux 8 | fuse-overlayfs +1 | 1.1.2-3.module+el8.3.0+7866+f387f528 | ELSA-2020-4694 |
| Oracle Linux 8 | libslirp +1 | 4.3.1-1.module+el8.3.0+7866+f387f528 | ELSA-2020-4694 |
| Oracle Linux 8 | podman +4 | 2.0.5-5.0.1.module+el8.3.0+7866+f387f528 | ELSA-2020-4694 |
| Oracle Linux 8 | python-podman-api | 1.2.0-0.2.gitd0a45fe.module+el8.3.0+7866+f387f528 | ELSA-2020-4694 |
| Oracle Linux 8 | runc | 1.0.0-68.rc92.module+el8.3.0+7866+f387f528 | ELSA-2020-4694 |
| Oracle Linux 8 | skopeo +2 | 1:1.1.1-3.0.1.module+el8.3.0+7866+f387f528 | ELSA-2020-4694 |
| Oracle Linux 8 | slirp4netns | 1.1.4-2.module+el8.3.0+7866+f387f528 | ELSA-2020-4694 |
| Oracle Linux 8 | udica | 0.2.2-1.module+el8.3.0+7866+f387f528 | ELSA-2020-4694 |
| Oracle Linux 7 | grafana | 6.7.4-1.0.1.el7 | ELSA-2020-5726 |
| Oracle Linux 7 | kubeadm +2 | 1.12.10-1.0.12.el7 | ELSA-2020-5727, ELSA-2020-5726, ELSA-2020-5725 |
| Oracle Linux 7 | kubeadm-ha-setup | 0.0.2-1.0.70.el7 | ELSA-2020-5725 |
| Oracle Linux 7 | kubernetes-cni | 0.7.1-1.0.1.el7 | ELSA-2020-5727, ELSA-2020-5726, ELSA-2020-5725 |
| Oracle Linux 7 | kubernetes-cni-plugins | 0.8.6-1.0.2.el7 | ELSA-2020-5727, ELSA-2020-5726, ELSA-2020-5725 |
| Oracle Linux 7 | olcne-istio-chart +1 | 1.1.1-3.el7 | ELSA-2020-5726 |
| Oracle Linux 7 | olcnectl +4 | 1.0.4-2.el7 | ELSA-2020-5727, ELSA-2020-5726 |
Public exploits
Exploit or proof-of-concept code for this vulnerability is publicly available, which lowers the bar for attackers. Treat it as a reason to patch sooner.
Third-party code, not reviewed by us. Public PoCs are sometimes fake or contain malware. Read the code first and run it only in an isolated lab, against systems you are authorised to test.
GitHub 1 repository
-
knqyf263/CVE-2020-10749 ★ 25 · Jun 11, 2020
CVE-2020-10749 PoC (Kubernetes MitM attacks via IPv6 rogue router advertisements)
Sources: PoC-in-GitHub, Metasploit Framework, Exploit-DB — updated daily. Only links are listed; no exploit code is hosted here.
Affected packages
| Ecosystem | Package | Affected | Fixed | Record |
|---|---|---|---|---|
| Go | github.com/containernetworking/plugins | < 0.8.6 | 0.8.6 | GHSA-fx6x-h9g4-56f8 |
Advisories 16
- ALSA-2020:4694 Moderate: container-tools:rhel8 security, bug fix, and enhancement update AlmaLinux Security Advisories · Oct 29, 2026
- RHSA-2020:4694 Red Hat Security Advisory: container-tools:rhel8 security, bug fix, and enhancement update Red Hat Security Advisories (RHSA) · Oct 14, 2026
- RHSA-2020:2684 Red Hat Security Advisory: containernetworking-plugins security update Red Hat Security Advisories (RHSA) · Aug 5, 2026
- RHSA-2020:2592 Red Hat Security Advisory: OpenShift Container Platform 4.2.36 containernetworking-plugins security update Red Hat Security Advisories (RHSA) · Aug 5, 2026
- RHSA-2020:2443 Red Hat Security Advisory: OpenShift Container Platform 4.3.25 containernetworking-plugins security update Red Hat Security Advisories (RHSA) · Aug 5, 2026
- RHSA-2020:2403 Red Hat Security Advisory: OpenShift Container Platform 4.4.8 containernetworking-plugins security update Red Hat Security Advisories (RHSA) · Aug 5, 2026
- RLSA-2020:4694 Moderate: container-tools:rhel8 security, bug fix, and enhancement update Rocky Linux Security Advisories · Feb 4, 2026
- SUSE-SU-2020:1957-1 Security update for cni-plugins SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2022:4151-1 Security update for cni-plugins SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2020:1050-1 Security update for cni-plugins SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2020:1049-1 Security update for cni-plugins SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2024:10689-1 cni-plugins-0.9.1-1.3 on GA media SUSE / openSUSE Security Updates · Feb 4, 2026
- ELSA-2020-4694 Moderate: container-tools:ol8 security, bug fix, and enhancement update (Oracle Linux 8) Oracle Linux Security Advisories (ELSA) · Nov 10, 2020
- ELSA-2020-5727 Important: kubernetes-cni-plugins kubernetes-cni kubernetes olcne security update (Oracle Linux 7) Oracle Linux Security Advisories (ELSA) · Jun 12, 2020
- ELSA-2020-5726 Important: grafana kubernetes-cni kubernetes-cni-plugins kubernetes kubernetes olcne security update (Oracle Linux 7) Oracle Linux Security Advisories (ELSA) · Jun 12, 2020
- ELSA-2020-5725 Important: kubernetes kubeadm-ha-setup kubernetes-cni kubernetes-cni-plugins security update (Oracle Linux 7) Oracle Linux Security Advisories (ELSA) · Jun 12, 2020
References
- https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2020-10749
- https://groups.google.com/forum/#%21topic/kubernetes-security-announce/BMb_6ICCfp8
- openSUSE-SU-2020:1049 vendor-advisory
- openSUSE-SU-2020:1050 vendor-advisory
- FEDORA-2021-ccb8a9c403 vendor-advisory