CVE-2021-25740
Holes in EndpointSlice Validation Enable Host Network Hijack
LOW
3.1
CVSS Score
Published: September 20, 2021 at 05:05 PM UTC
Updated: June 17, 2026 at 03:42 AM UTC
1 product affected across 1 vendorKubernetes
Using Kubernetes by Kubernetes?
Get instant alerts when new vulnerabilities affect Kubernetes - before attackers find them.
Real-time alertsTrack your software stackFree plan available
Severity
LOW3.1
Exploit prediction
EPSS 2%
Description
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.
Affected
Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.
All versions
Remediation
No guide yetNo remediation guidance has been written for this CVE yet. What the record does show:
References (4)
x_refsource_MISCMitigationThird Party Advisory
Source: [email protected]
https://github.com/kubernetes/kubernetes/issues/103675x_refsource_MISCMailing ListMitigationThird Party Advisory
Source: [email protected]
https://groups.google.com/g/kubernetes-security-announce/c/WYE9ptrhSLEx_refsource_CONFIRMThird Party Advisory
Source: [email protected]
https://security.netapp.com/advisory/ntap-20211014-0001/x_refsource_MISC
Source: cverecord
https://kubernetes.io/blog/2026/05/26/reconciling-unfixed-kubernetes-cves/CVSS
3.1LOWkubernetes
- Attack Vector
- NETWORK
- Complexity
- HIGH
- Privileges
- LOW
- User Interaction
- NONE
- Scope
- UNCHANGED
- Confidentiality
- LOW
- Integrity
- NONE
- Availability
- NONE
Vector?
Quick Info
StatusMODIFIED
CWE
CWE-441CWE-610
Get alerted
Stop reading CVE feeds looking for your own stack
Track the products you run and VulnTracker tells you when a new CVE affects them — with what is known about fixing it, and nothing about the rest.
Free plan, no card