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01 Record

CVE-2021-25737

Holes in EndpointSlice Validation Enable Host Network Hijack

LowPUBLISHEDCNA: kubernetes
CNA base score2.7 CVSS v3.xCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:L/I:N/A:N

02 Description

Holes in EndpointSlice Validation Enable Host Network Hijack

03 Exploitation and scoring

Exploitation
Not assessed. CISA has not published an exploitation assessment for this record, and it is not in the KEV catalog. That is an absence of assessment, not a finding of no risk.
SSVC decision
Not assessed by CISA
EPSS probability
1.32% probability of exploitation activity in the next 30 days.
EPSS percentile
Equal to or higher than the score of 70.7% of scored records. A rank, not a probability.
NVD base score
4.8 (CVSS v3.x), scored by the NVD independently of the CNA.
NVD CVSS vector
CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N
NVD analysis status
Modified. NVD last modified this record on 2026-06-17.
Red Hat severity
Low. Red Hat's rating for its own products, not a CVSS rating.

Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.

04 Metadata

Published
2021-09-06 11:32Z5 YR AGO
Last updated
2024-09-16 21:04Z2 YR AGO
Reserved
2021-01-21
Assigning CNA
kubernetes
Record state
PUBLISHED
Severity
Low (CVSS 2.7)
CNA CVSS vector
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:L/I:N/A:N
Weaknesses
  • CWE-184Incomplete List of Disallowed InputsBase
  • CWE-601URL Redirection to Untrusted Site ('Open Redirect')Base
  • CWE-20Improper Input ValidationClass
Data version
5.1
Document digest
200aa5aa374fb421dad47a58c260b2f398d8d0db8cf4542d1e7ee4c3cf5e4e50

05 Affected products

VendorProductVersionsPlatforms
KubernetesKubernetes<= 1.18.18, <= 1.19.10, <= 1.20.6, <= 1.21.0—

06 References

07 Fixed in

Arch Linux

  • kube-apiserver
    Fixed in 1.21.1-1

Source: Arch Linux Security Tracker, the Arch Linux security team. Reformatted by exploit.cc.

Debian 12

  • kubernetes
    Fixed in 1.20.5+really1.20.2-1

Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.

Debian 13

  • kubernetes
    Fixed in 1.20.5+really1.20.2-1

Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.

Debian 14

  • kubernetes
    Fixed in 1.20.5+really1.20.2-1

Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.

A release or ecosystem missing from this list has no record here. It may be unaffected or not covered by the source. Source notices and licences.