Node address isn't always verified when proxying
Users may have access to secure endpoints in the control plane network. Kubernetes clusters are only affected if an untrusted user can modify Node objects and send proxy requests to them. Kubernetes supports node proxying, which allows clients of kube-apiserver to access endpoints of a Kubelet to establish connections to Pods, retrieve container logs, and more. While Kubernetes already validates the proxying address for Nodes, a bug in kube-apiserver made it possible to bypass this validation. Bypassing this validation could allow authenticated requests destined for Nodes to to the API server's private network.
- Published
- Mar 1, 2023
- Updated
- Jun 17, 2026
- EPSS
- 1.6% · 75th percentile
- CWE
- CWE-20
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Report tools
Action score
35
Monitor
Low priority for now.
- CVSS
- 35 / 40 · 8.8 / 10
- CISA KEV
- 0 / 30 · Not listed
- EPSS
- 0 / 30 · 1.6%
CISA SSVC decision
- Exploitation
- none
- Automatable
- no
- Technical impact
- total
Vulnrichment: CISA's decision-tree inputs.
CNA vs NVD score
- NVD
- 8.8
- CNA · kubernetes
- 6.6
- 2.2 point gap
CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:H
The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.
Affected systems
| Vendor | Product | CPE |
|---|---|---|
| kubernetes | kubernetes | cpe:2.3:a:kubernetes:kubernetes |
Using kubernetes? Add it to your stack and be the first to know about CVEs like this one. (Kubernetes)
Affected versions
NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.
- kubernetes kubernetesbefore 1.22.16
- kubernetes kubernetes1.23.0 and later · before 1.23.14
- kubernetes kubernetes1.24.0 and later · before 1.24.8
- kubernetes kubernetes1.25.0 and later · before 1.25.4
Versions reported by the vendor
Affected version ranges reported by the assigning authority (kubernetes). Independent of NVD's CPE analysis and usually ahead of it.
Kubernetes Kubernetes
- unspecified and later · up to and including v1.25.3affected
- unspecified and later · up to and including v1.24.7affected
- unspecified and later · up to and including v1.23.13affected
- unspecified and later · up to and including v1.22.15affected
Package-level exposure
OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.
| Ecosystem | Package | Affected range | Fix |
|---|---|---|---|
| Debian:12 | kubernetes | before 1.20.5+really1.20.2-1 | 1.20.5+really1.20.2-1 |
| Go | github.com/kubernetes/kubernetes | from 1.22.0 · before 1.22.16 | 1.22.16 |
| Go | github.com/kubernetes/kubernetes | from 1.23.0 · before 1.23.14 | 1.23.14 |
| Go | github.com/kubernetes/kubernetes | from 1.24.0 · before 1.24.8 | 1.24.8 |
| Go | github.com/kubernetes/kubernetes | from 1.25.0 · before 1.25.4 | 1.25.4 |
| Go | k8s.io/kubernetes | from 1.22.0 · before 1.22.16 | 1.22.16 |
| Go | k8s.io/kubernetes | from 1.23.0 · before 1.23.14 | 1.23.14 |
| Go | k8s.io/kubernetes | from 1.24.0 · before 1.24.8 | 1.24.8 |
| Go | k8s.io/kubernetes | from 1.25.0 · before 1.25.4 | 1.25.4 |
| openSUSE:Tumbleweed | kubernetes1.25 | before 1.25.7-1.1 | 1.25.7-1.1 |
| Red Hat:openshift:4.12::el8 | microshift | before 0:4.12.1-202301261525.p0.g3db9e81.assembly.4.12.1.el8 | 0:4.12.1-202301261525.p0.g3db9e81.assembly.4.12.1.el8 |
| SUSE:Linux Enterprise Module for Containers 15 SP4 | kubernetes1.23 | before 1.23.17-150300.7.6.1 | 1.23.17-150300.7.6.1 |
Same product
kubernetes: all recordsOther highest-scoring records for the same primary product.
- CVE-2018-1002105In all Kubernetes versions prior to v1.10.11, v1.11.5, and v1.12.3, incorrect handling of error responses to proxied upgrade requests in the65This week
- CVE-2019-11248Kubernetes kubelet exposes /debug/pprof info on healthz port55Plan
- CVE-2017-1002101In Kubernetes versions 1.3.x, 1.4.x, 1.5.x, 1.6.x and prior to versions 1.7.14, 1.8.9 and 1.9.4 containers using subpath volume mounts with 42Plan
- CVE-2018-1002101In Kubernetes versions 1.9.0-1.9.9, 1.10.0-1.10.5, and 1.11.0-1.11.1, user input was handled insecurely while setting up volume mounts on Wi40Plan
- CVE-2017-1000056Kubernetes version 1.5.0-1.5.4 is vulnerable to a privilege escalation in the PodSecurityPolicy admission plugin resulting in the ability to40Plan
- CVE-2016-1906Openshift allows remote attackers to gain privileges by updating a build configuration that was created with an allowed type to a type that 40Plan
Remediation
Which version to upgrade to
Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.
| Product / package | Fixed version | Source |
|---|---|---|
| debian:kubernetes | 1.20.5+really1.20.2-1 · Debian:12 | Package registry (OSV) |
| Go:github.com/kubernetes/kubernetes | 1.22.16 | Package registry (OSV) |
| Go:github.com/kubernetes/kubernetes | 1.23.14 | Package registry (OSV) |
| Go:github.com/kubernetes/kubernetes | 1.24.8 | Package registry (OSV) |
| Go:github.com/kubernetes/kubernetes | 1.25.4 | Package registry (OSV) |
| Go:k8s.io/kubernetes | 1.22.16 | Package registry (OSV) |
| Go:k8s.io/kubernetes | 1.23.14 | Package registry (OSV) |
| Go:k8s.io/kubernetes | 1.24.8 | Package registry (OSV) |
| Go:k8s.io/kubernetes | 1.25.4 | Package registry (OSV) |
| opensuse:kubernetes1.25 | 1.25.7-1.1 · openSUSE:Tumbleweed | Package registry (OSV) |
| red hat:microshift | 0:4.12.1-202301261525.p0.g3db9e81.assembly.4.12.1.el8 · Red Hat:openshift:4.12::el8 | Package registry (OSV) |
| suse:kubernetes1.23 | 1.23.17-150300.7.6.1 · SUSE:Linux Enterprise Module for Containers 15 SP4 | Package registry (OSV) |
Exploit status
Proof of concept available
A public proof of concept or detection signature exists. Exploit knowledge is out there; don't delay patching.
Evidence
- Proof-of-concept repository on GitHub ×1
Noroxi does not host or link to exploit code. Metasploit module names and Nuclei template ids are shown (names, not code); Exploit-DB entries and PoC repositories are given as counts only.
| Source | Kind | Date |
|---|---|---|
| Proof-of-concept repository on GitHub | stars:0 | 2026-01-14 |
Research context
For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.
Timeline
From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.
- Published
- First PoC+1049 d
- TodaySep 30, 2026+1309 d
FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).
Patch and commit links
Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.
No commit or PR link among the references.
Credits
All researchersFinders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.
- Yuval AvrahamiPalo Alto Networks
Variant candidates
Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.
No nightly-computed relations.
Chain candidates
An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.
—
Bug bounty scope
The product’s vendor appears in a public program. Matched by name; verify the scope text in the program.
Technical details
Attack conditions
- Anyone who can reach it over the internet can trigger it.
- A low-privileged account is enough.
- No user action is required.
- No special conditions are required; it is repeatable.
If successful
- Confidentiality
- high · data can be read
- Integrity
- high · data or configuration can be modified
- Availability
- high · the service can be disrupted
- Attack vector
- Network
- Attack complexity
- Low
- Privileges required
- Low
- User interaction
- None
- Scope
- Unchanged
- Confidentiality impact
- High
- Integrity impact
- High
- Availability impact
- High
Weakness class (CWE)
CWE-20 · Improper Input ValidationCVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
nvd-primary
Attack context
MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.
Attack patterns (CAPEC)
- Buffer Overflow via Environment VariablesCAPEC-10likelihood: High · High
- Server Side Include (SSI) InjectionCAPEC-101likelihood: High · High
- Cross Zone ScriptingCAPEC-104likelihood: Medium · High
- Command Line Execution through SQL InjectionCAPEC-108likelihood: Low · Very High
- Object Relational Mapping InjectionCAPEC-109likelihood: Low · High
- SQL Injection through SOAP Parameter TamperingCAPEC-110likelihood: High · Very High
- Double EncodingCAPEC-120likelihood: Low · Medium
- Subverting Environment Variable ValuesCAPEC-13likelihood: High · Very High
ATT&CK techniques
- Obfuscated Files or InformationT1027
- Masquerading: Invalid Code SignatureT1036.001
- Steal Web Session CookieT1539
- Subvert Trust Controls: Code SigningT1553.002
- Impair Defenses:Impair Command History LoggingT1562.003
- Hijack Execution Flow:Dynamic Linker HijackingT1574.006
- Hijack Execution Flow:Path Interception by PATH Environment VariableT1574.007
Noroxi analysis
No Noroxi analysis for this record yet
We don't hand-write analysis for all 385,000+ vulnerabilities; that wouldn't be honest. For notable, high-impact vulnerabilities our team writes the mechanism, detection and remediation steps.
We use this product, ask for helpChange log
- Fix✗ → ✓
For records you follow, these changes also arrive as notifications. →
References
- github.com/kubernetes/kubernetes/issues/113757
- groups.google.com/g/kubernetes-security-announce/c/VyPOxF7CIbA
- security.netapp.com/advisory/ntap-20230505-0007/
Vendor advisories and official records. Exploit/PoC links are deliberately left out.