CVE-2020-8562
Description
As mitigations to a report from 2019 and CVE-2020-8555, Kubernetes attempts to prevent proxied connections from accessing link-local or localhost networks when making user-driven connections to Services, Pods, Nodes, or StorageClass service providers. As part of this mitigation Kubernetes does a DNS name resolution check and validates that response IPs are not in the link-local (169.254.0.0/16) or localhost (127.0.0.0/8) range. Kubernetes then performs a second DNS resolution without validation for the actual connection. If a non-standard DNS server returns different non-cached responses, a user may be able to bypass the proxy IP restriction and access private networks on the control plane.
Predictions
Heuristic predictions, AS-IS, for prioritization only.
Mitigations
No mitigations published for this CVE yet.
The vendor-content worker queues fetches as references arrive (check back in a few minutes). Or — if you've already worked around this in production — publish your fix to the community-verified tier.
✚ Propose a mitigation on Community → Mitigations published via the community go through AI scoring + 2 human reviewers + 7-day silent objection window before landing here withsource_tier=community-verified.
OS impact
Arch Affected 1 release
| Version | Status | Fixed in |
|---|---|---|
| — | Affected | — |
SUSE Affected 1 release
| Version | Status | Fixed in |
|---|---|---|
| — | Affected | — |
Debian Fixed 5 releases
| Version | Status | Fixed in |
|---|---|---|
| trixie | Fixed | 1.20.5+really1.20.2-1 |
| sid | Fixed | 1.20.5+really1.20.2-1 |
| forky | Fixed | 1.20.5+really1.20.2-1 |
| bullseye | Fixed | 1.20.5+really1.20.2-1 |
| bookworm | Fixed | 1.20.5+really1.20.2-1 |
Package impact
| Ecosystem | Package | Vulnerable | Fixed |
|---|---|---|---|
| Go | k8s.io/kubernetes | >=1.21.0,<=1.21.1 | |
| Go | k8s.io/kubernetes | >=1.20.0,<=1.20.7 | |
| Go | k8s.io/kubernetes | >=1.19.0,<=1.19.11 | |
| Go | k8s.io/kubernetes | <=1.18.19 | |
| Go | k8s.io/kubernetes | | |
Application impact
| Vendor | Product | Versions | Fixed |
|---|---|---|---|
| kubernetes | kubernetes | {"endIncluding":"1.18.18"} | |
| kubernetes | kubernetes | {"startIncluding":"1.19.0","endIncluding":"1.19.10"} | |
| kubernetes | kubernetes | {"startIncluding":"1.20.0","endIncluding":"1.20.6"} | |
| kubernetes | kubernetes | 1.21.0 | |
References
- https://www.suse.com/security/cve/CVE-2020-8562.html
- https://nvd.nist.gov/vuln/detail/CVE-2020-8562
- https://github.com/kubernetes/kubernetes/issues/101493
- https://github.com/kubernetes/kubernetes/issues/101493#issuecomment-2272095629
- https://github.com/kubernetes/kubernetes
- https://groups.google.com/g/kubernetes-security-announce/c/-MFX60_wdOY
- https://security.netapp.com/advisory/ntap-20220225-0002
- https://github.com/advisories/GHSA-qh36-44jv-c8xj
- https://security-tracker.debian.org/tracker/CVE-2020-8562
- https://kubernetes.io/blog/2026/05/26/reconciling-unfixed-kubernetes-cves/
- https://security.netapp.com/advisory/ntap-20220225-0002/
CWEs
CWE-367
Community-verified mitigations for this CVE will appear above when contributors publish them.
Verify integrity in audit chain (admin only). AS-IS.