Privilege escalation using hop-by-hop Connection header
Published Feb 22, 2022
8.8
HIGHCVSS 3.1
EPSS 1.40%
Description
capsule-proxy is a reverse proxy for Capsule Operator which provides multi-tenancy in Kubernetes. In versions prior to 0.2.1 an attacker with a proper authentication mechanism may use a malicious `Connection` header to start a privilege escalation attack towards the Kubernetes API Server. This vulnerability allows for an exploit of the `cluster-admin` Role bound to `capsule-proxy`. There are no known workarounds for this issue.
Affected products
-
- Version < 0.2.1StatusaffectedConstraints-
- Version
Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).
| Vendor | Product | Default status | Versions | ||||||
|---|---|---|---|---|---|---|---|---|---|
| Clastix | Capsule-Proxy | n/a |
|
- < 0.2.1
No data.
No Red Hat product state for this CVE.
github.com/clastix/capsule-proxy
Go
Introduced 0 Fixed 0.2.1
| Ecosystem | Package | Introduced | Fixed |
|---|---|---|---|
| Go | github.com/clastix/capsule-proxy | 0 | 0.2.1 |
Remediation
No remediation recorded yet.
Metrics
No CVSS v4.0 score for this CVE.
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
No CVSS v3.0 score for this CVE.
AV:N/AC:L/Au:S/C:P/I:P/A:P
This CVE is not in the KEV list.
CISA SSVC (Vulnrichment)
Stakeholder-Specific Vulnerability Categorization from CISA ADP.
Exploitation
PoCAutomatable
NoTechnical Impact
TotalDecision
n/aAssessed Apr 22, 2025 · SSVC 2.0.3
Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 3, 2026.
Score over time
2022–2026- EPSS v2
- EPSS v3
- EPSS v4
- EPSS v5
Percentile over time
- EPSS v2
- EPSS v3
- EPSS v4
- EPSS v5
Table of values (13 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 3, 2026 | 1.40% (0.01397) | 71.49th | v5 (v2026.06.15) |
| Jun 15, 2026 | 1.38% (0.01375) | 68.37th | v5 (v2026.06.15) |
| Mar 17, 2025 | 0.39% (0.00392) | 58.12th | v4 (v2025.03.14) |
| Dec 12, 2024 | 0.29% (0.00288) | 69.76th | v3 (v2023.03.01) |
| May 16, 2024 | 0.29% (0.00288) | 68.77th | v3 (v2023.03.01) |
| Oct 14, 2023 | 0.22% (0.00223) | 60.31th | v3 (v2023.03.01) |
| Sep 30, 2023 | 0.19% (0.00186) | 55.45th | v3 (v2023.03.01) |
| Sep 15, 2023 | 0.15% (0.00151) | 50.90th | v3 (v2023.03.01) |
| Mar 7, 2023 | 0.13% (0.00126) | 45.47th | v3 (v2023.03.01) |
| Mar 6, 2023 | 0.89% (0.00890) | 30.33th | v2 (v2022.01.01) |
| Sep 10, 2022 | 0.89% (0.00890) | 28.64th | v2 (v2022.01.01) |
| Apr 1, 2022 | 0.89% (0.00890) | 26.62th | v2 (v2022.01.01) |
| Feb 23, 2022 | 0.89% (0.00890) | 12.68th | v2 (v2022.01.01) |
References (5)
- https://github.com/advisories/GHSA-9cwv-cppx-mqjm Advisory
- https://github.com/clastix/capsule-proxy/commit/efe91f68ebf8a9e3d21491dc57da7b8a746415d8 x_refsource_MISCPatchThird Party Advisory
- https://github.com/clastix/capsule-proxy/issues/188 x_refsource_MISCExploitIssue TrackingThird Party Advisory
- https://github.com/clastix/capsule-proxy/security/advisories/GHSA-9cwv-cppx-mqjm x_refsource_CONFIRMThird Party Advisory
- https://nvd.nist.gov/vuln/detail/CVE-2022-23652
| Link | Providers | Tags |
|---|---|---|
| https://github.com/advisories/GHSA-9cwv-cppx-mqjm | Advisory | |
| https://github.com/clastix/capsule-proxy/commit/efe91f68ebf8a9e3d21491dc57da7b8a746415d8 | x_refsource_MISCPatchThird Party Advisory | |
| https://github.com/clastix/capsule-proxy/issues/188 | x_refsource_MISCExploitIssue TrackingThird Party Advisory | |
| https://github.com/clastix/capsule-proxy/security/advisories/GHSA-9cwv-cppx-mqjm | x_refsource_CONFIRMThird Party Advisory | |
| https://nvd.nist.gov/vuln/detail/CVE-2022-23652 |
Change history (0)
No recorded changes yet.