Cloud Controller is vulnerable to denial of service via YAML parsing
Priority LOW 35CWE-400Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Denial of service
- Confidentiality · integrity · availability
- None · None · High
- Fix status
- Fixed
Attack profile from CVSS 3.1 · NVD. Fix status from CNA. Impact type from CWE-400.
Summary
CAPI (Cloud Controller) versions prior to 1.101.0 are vulnerable to a denial-of-service attack in which an unauthenticated malicious attacker can send specially-crafted YAML files to certain endpoints, causing the YAML parser to consume excessive CPU and RAM.
Why it matters now
EPSS 0.01145 66th percentileScored 2026-11-07
Fix Fixed CAPI (Cloud Foundry): 1.101.0CF Deployment (Cloud Foundry): 15.0.0
SSVC decision points
Not available: CISA has not published SSVC decision points for this record.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| Cloud Foundry | CAPI | All to before 1.101.0 | 1.101.0 | Patch available | CNA |
| Cloud Foundry | CF Deployment | All to before 15.0.0 | 15.0.0 | Patch available | CNA |
- CAPI VendorCloud Foundry Affected All to before 1.101.0 Fixed in 1.101.0 Patch available CNA
- CF Deployment VendorCloud Foundry Affected All to before 15.0.0 Fixed in 15.0.0 Patch available CNA
CPE configurations NVD · 2
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:cloudfoundry:capi-release:*:*:*:*:*:*:*:* | before 1.101.0 | Vulnerable | CloudFoundry Foundation |
| cpe:2.3:a:cloudfoundry:cf-deployment:*:*:*:*:*:*:*:* | before 15.0.0 | Vulnerable | CloudFoundry Foundation |
- cpe:2.3:a:cloudfoundry:capi-release:*:*:*:*:*:*:*:* Versions before 1.101.0 Vulnerable ·CloudFoundry Foundation
- cpe:2.3:a:cloudfoundry:cf-deployment:*:*:*:*:*:*:*:* Versions before 15.0.0 Vulnerable ·CloudFoundry Foundation
Remediation
- Fix · CNA CAPI (Cloud Foundry) Fixed in 1.101.0
- Fix · CNA CF Deployment (Cloud Foundry) Fixed in 15.0.0
Timeline
- 2026-10-02 Threatist record created from CVE-2020-5423
- 2026-10-03 Alias added: GHSA-jj4c-53qh-fp5v
References
More Cloud Foundry vulnerabilities
- TI-2018-11240 UAA Privilege Escalation CVSS 3.0CRITICAL 9.9
- TI-2018-01169 Log Cache logs UAA client secret on startup CVSS 3.0CRITICAL 9.8
- TI-2018-07868 Cloud Foundry UAA MFA does not prevent brute force of MFA code CVSS 3.0CRITICAL 9.8
- TI-2026-18259 Cloud Foundry UAA SAML 2.0 Signature Bypass CVSS 3.1HIGH 8.6
- TI-2019-02813 Java Projects using HTTP to fetch dependencies CVSS 3.1CRITICAL 9.8
- TI-2024-24613 Authentication bypass by spoofing in Cloud Foundry haproxy-boshrelease CVSS 3.1CRITICAL 9.1
Sources
- CVE-2020-5423 · CVE Program
- CVE-2020-5423 · NVD
- FIRST EPSS
- GHSA-jj4c-53qh-fp5v · GitHub Advisory Database · CC BY 4.0
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