CVE-2021-25741: kubernetes Improper Input Validation
CVSS: 8.8v3.1HighModified
AliasesRHSA-2021:3631RHSA-2021:3635RHSA-2021:3642RHSA-2021:3646UBUNTU-CVE-2021-25741DEBIAN-CVE-2021-25741CGA-2ww2-w5vf-cqc6CGA-8x24-cpp8-jcgpGHSA-f5f7-6478-qm6pGO-2022-0910
Published 20-09-2021Last modified 16-09-2024
Vulnerability summary
CVE-2021-25741 is a high (CVSS 8.8) Improper Input Validation vulnerability in kubernetes. EPSS estimates a 7.96% chance of exploitation in the next 30 days, higher than 94.6% of scored vulnerabilities.
CVSS score
8.8/10
010
High · v3.1 (CVE.org)EPSS score
7.96%
0%100%
Low · 0.00 pp in 30 daysKEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded
Advisory lineage
Upstream 0 · Downstream 1 · Related 4Timeline
- 20-09-2021PublishedVulnerability first disclosed.
- 16-09-2024Last modifiedVulnerability information updated.
Description
A security issue was discovered in Kubernetes where a user may be able to create a container with subpath volume mounts to access files & directories outside of the volume, including on the host filesystem.
CVSS metrics
9 scores · 8 sources · 2 versionsHigh 8.8Preferred score · CVE.org (CNA)
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:HSources8 sources · 8.1–8.8
- OSV · Red hatEcosystem advisory · calculated8.8HighCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- OSV · UbuntuEcosystem advisory · calculated8.1HighCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:NDiffers
- OSV · DebianEcosystem advisory · calculated8.1HighCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:NDiffers
- OSV · WolfiEcosystem advisory · calculated8.1HighCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:NDiffers
- OSV · GoEcosystem advisory · calculated8.1HighCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:NDiffers
- OSV · ChainguardEcosystem advisory · calculated8.1HighCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:NDiffers
- NVDNIST8.1HighCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:NDiffers
Medium 5.5Preferred score · NVD (NIST)
AV:N/AC:L/Au:S/C:P/I:P/A:NSourcesSingle source
EPSS trend
Probability
7.96%
Chance of exploitation in the next 30 days
Percentile
95%
Versus all other CVEs
30-day change
0.00 pp
From 7.96% on 19-09-2026
19-09-202619-10-2026
EPSS score7.96%
Known exploited
Compare KEV catalogsNot in any of the 3 tracked catalogs.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root cause- CWE-20Improper Input ValidationThe product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly.
- CWE-552Files or Directories Accessible to External PartiesThe product makes files or directories accessible to unauthorized actors, even though they should not be.
Affected systems
Redhat15 products
- atomic-openshift< 0:3.11.524-1.git.0.2dffce7.el7
- atomic-openshift-clients< 0:3.11.524-1.git.0.2dffce7.el7
- atomic-openshift-clients-redistributable< 0:3.11.524-1.git.0.2dffce7.el7
- atomic-openshift-docker-excluder< 0:3.11.524-1.git.0.2dffce7.el7
- atomic-openshift-excluder< 0:3.11.524-1.git.0.2dffce7.el7
Chainguard1 product
- kubeflow-pipelinesAll versions (No fix recorded)
Debian1 product
- kubernetes< 1.20.5+really1.20.2-1
K8s.io1 product
- kubernetes< 1.19.15 | ≥ 1.20.0, < 1.20.11 | ≥ 1.21.0, < 1.21.5 | ≥ 1.22.0, < 1.22.2
Kubernetes1 product
- kubernetes≥ unspecified, ≤ 1.19.14 | ≥ unspecified, ≤ 1.20.10 | ≥ unspecified, ≤ 1.21.4 | ≥ unspecified, ≤ 1.22.1 | ≤ 1.19.14 | ≥ 1.20.0, ≤ 1.20.10 | ≥ 1.21.0, ≤ 1.21.4 | ≥ 1.22.0, ≤ 1.22.1
Ubuntu1 product
- kubernetesAll versions (No fix recorded)
Wolfi1 product
- kubeflow-pipelinesAll versions (No fix recorded)
7 vendors · 21 products
References
21 links- groups.google.com/g/kubernetes-security-announce/c/nyfdhK24H7sX Refsource MISCARTICLEWEBMailing ListMitigation
- github.com/kubernetes/kubernetes/issues/104980X Refsource MISCREPORTWEBMitigationThird Party Advisory
