CVE-2021-25736
unknown
CVSS v3
—
CVSS v2
—
VIR risk
—
Description
Kube-proxy on Windows can unintentionally forward traffic to local processes listening on the same port (“spec.ports[*].port”) as a LoadBalancer Service when the LoadBalancer controller does not set the “status.loadBalancer.ingress[].ip” field. Clusters where the LoadBalancer controller sets the “status.loadBalancer.ingress[].ip” field are unaffected.
Predictions
Exploit likelihood
30%
Patch ETA
—
Heuristic predictions, AS-IS, for prioritization only.
Mitigations
Vendor advisory: debian — https://security-tracker.debian.org/tracker/CVE-2021-25736
OS impact
| OS | Version | Status | Fixed in |
|---|---|---|---|
| debian | bookworm | fixed | 0 |
| debian | bullseye | fixed | 0 |
| debian | forky | fixed | 0 |
| debian | sid | fixed | 0 |
| debian | trixie | fixed | 0 |
Package impact
| Ecosystem | Package | Vulnerable | Fixed |
|---|---|---|---|
| Go | k8s.io/kubernetes | <1.21 | 1.21 |
| Go | k8s.io/kubernetes | <1.21.0 | 1.21.0 |
References
- https://nvd.nist.gov/vuln/detail/CVE-2021-25736
- https://github.com/kubernetes/kubernetes/pull/99958
- https://github.com/kubernetes/kubernetes/commit/b014610de3e5cf1bb0f7844b5758d29fc18b75e6
- https://github.com/kubernetes/kubernetes
- https://groups.google.com/g/kubernetes-security-announce/c/lIoOPObO51Q/m/O15LOazPAgAJ
- https://security.netapp.com/advisory/ntap-20231221-0003
- https://github.com/advisories/GHSA-35c7-w35f-xwgh
- https://security-tracker.debian.org/tracker/CVE-2021-25736
Verify integrity in audit chain (admin only). AS-IS.