What’s Vulnerable › Vulnerabilities
CVE-2020-8554: Kubernetes man in the middle using LoadBalancer or ExternalIPs
- Severity: medium (CVSS 5.0 v3.1)
- Exploited in the wild: not listed in CISA KEV
- EPSS: 8.7% probability of exploitation in the next 30 days
- Public exploit or detection template: yes
- Published: 2021-01-21 · updated 2026-06-17
- Weakness: CWE-283
Description
Kubernetes API server in all versions allow an attacker who is able to create a ClusterIP service and set the spec.externalIPs field, to intercept traffic to that IP address. Additionally, an attacker who is able to patch the status (which is considered a privileged operation and should not typically be granted to users) of a LoadBalancer service can set the status.loadBalancer.ingress.ip to similar effect.
Affected products
- Kubernetes: all versions
- Oracle Communications Cloud Native Core Network Slice Selection Function: 1.2.1
- Oracle Communications Cloud Native Core Policy: 1.15.0
- Oracle Communications Cloud Native Core Service Communication Proxy: 1.14.0
References
- https://github.com/kubernetes/kubernetes/issues/97076
- https://groups.google.com/g/kubernetes-security-announce/c/iZWsF9nbKE8
- https://kubernetes.io/blog/2026/05/26/reconciling-unfixed-kubernetes-cves/
- https://lists.apache.org/thread.html/r0c76b3d0be348f788cd947054141de0229af00c540564711e828fd40%40%3Ccommits.druid.apache.org%3E
- https://lists.apache.org/thread.html/r1975078e44d96f2a199aa90aa874b57a202eaf7f25f2fde6d1c44942%40%3Ccommits.druid.apache.org%3E
- https://lists.apache.org/thread.html/rcafa485d63550657f068775801aeb706b7a07140a8ebbdef822b3bb3%40%3Ccommits.druid.apache.org%3E
- https://lists.apache.org/thread.html/rdb223e1b82e3d7d8e4eaddce8dd1ab87252e3935cc41c859f49767b6%40%3Ccommits.druid.apache.org%3E
- https://www.oracle.com//security-alerts/cpujul2021.html
- https://www.oracle.com/security-alerts/cpuapr2022.html
- https://www.oracle.com/security-alerts/cpujan2022.html
- https://github.com/kubernetes/kubernetes/issues/97076
- https://groups.google.com/g/kubernetes-security-announce/c/iZWsF9nbKE8
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