🛡️ CVE-2021-25740 — kubernetes

🟢 CVSS 2.0 — Low ✅ No Known Exploit CWE-441 OSV
2.0
CVSS Score
0 Low4 Medium7 High9 Critical10

Description

Confused Deputy in Kubernetes

A security issue was discovered with Kubernetes that could enable users to send network traffic to locations they would otherwise not have access to via a confused deputy attack.

How this vulnerability can be exploited

This issue can be reached over the network, attack complexity is high, an attacker needs low-level privileges on the target. No user interaction is required. The scope is unchanged, so the impact stays within the vulnerable component. Rated impact: confidentiality low, integrity none, availability none.

Affected software

CVE-2021-25740 is recorded against 1 package.

  • k8s.io/kubernetes

Timeline and source

Published on 21 September 2021 and last revised on 9 June 2026. No public exploit is currently recorded for this entry. Record sourced from OSV.

References

nvd.nist.gov (Advisory)
github.com (Web)
github.com (Package)
groups.google.com (Web)
kubernetes.io (Web)
security.netapp.com (Web)

CVE-2021-25740 on other distributions

Each distribution ships its own build and its own fixed version. Pick the one you run:

Details

Severity LOW
CVSS Score 2.0
CVSS Vector CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:N/A:N
CWE CWE-441
Public Exploit ✅ No
Source OSV
Published 2021-09-21
Updated 2026-08-12
Modified 2026-06-09
Fix URL N/A

Affected Packages

Software From version Fixed in
k8s.io/kubernetes — —

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