CVE-2020-8561

medium

Published 2021-09-21 · Modified 2026-06-01

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CVSS v3

4.1

CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:L/I:N/A:N

CVSS v4 NEW

—

not yet in upstream

VIR risk

4.1

Description

A security issue was discovered in Kubernetes where actors that control the responses of MutatingWebhookConfiguration or ValidatingWebhookConfiguration requests are able to redirect kube-apiserver requests to private networks of the apiserver. If that user can view kube-apiserver logs when the log level is set to 10, they can view the redirected responses and headers in the logs.

Predictions

Exploit likelihood

51%

Patch ETA

—

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 with source_tier=community-verified.

OS impact

Arch 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	`<=1.22.2`

Application impact

Vendor	Product	Versions
kubernetes	kubernetes	`1.20.11`
kubernetes	kubernetes	`1.21.5`
kubernetes	kubernetes	`1.22.2`

References

CWEs

CWE-441 CWE-610

Community-verified mitigations for this CVE will appear above when contributors publish them.

Verify integrity in audit chain (admin only). AS-IS.