Open Redirect in Kubernetes
CVE-2021-25737
A security issue was discovered in Kubernetes where a user may be able to redirect pod traffic to private networks on a Node. Kubernetes already prevents creation of Endpoint IPs in the localhost or link-local range, but the same validation was not performed on EndpointSlice IPs.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 2.7 (Low). Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:L/I:N/A:N.
EPSS exploit prediction
EPSS: 0.013 (69.8th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 70th percentile — 69.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.013 · newest: 0.013 · change: -0.000
Affected products
- Kubernetes — versions unspecified, 1.21.0
Weakness classification (CWE)
Public proof-of-concept exploits
- 43622283/awesome-cloud-native-security
- ARPSyndicate/cvemon
- Metarget/awesome-cloud-native-security
- adavarski/HomeLab-Proxmox-k8s-DevSecOps-playground
- adavarski/HomeLab-k8s-DevSecOps-playground
- atesemre/awesome-cloud-native-security
- atwilsecurity/k8s-Security
- dli408097/k8s-security
- kajogo777/kubernetes-misconfigured
- magnologan/awesome-k8s-security
References
- groups.google.com/g/kubernetes-security-announce/c/xAiN3924thY (Mailing List, Third Party Advisory)
- github.com/kubernetes/kubernetes/issues/102106 (Patch, Third Party Advisory)
- security.netapp.com/advisory/ntap-20211004-0004/ (Third Party Advisory)
Frequently asked questions
- What is CVE-2021-25737?
- CVE-2021-25737 is a low-severity vulnerability in Kubernetes, classified under Incomplete List of Disallowed Inputs. CVSS score: 2.7/10. Published 2021-09-06.
- How severe is CVE-2021-25737?
- Low severity. CVSS v3 base score is 2.7 out of 10.
- Is CVE-2021-25737 known to be exploited?
- 13 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.