What’s Vulnerable › Vulnerabilities

CVE-2023-20882

• Severity: medium (CVSS 5.9 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.6% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2023-05-26 · updated 2026-06-17
• Weakness: CWE-400

Description

In Cloud foundry routing release versions from 0.262.0 and prior to 0.266.0,a bug in the gorouter process can lead to a denial of service of applications hosted on Cloud Foundry. Under the right circumstances, when client connections are closed prematurely, gorouter marks the currently selected backend as failed and removes it from the routing pool.

Affected products

• Cloud Foundry cf-deployment: from 27.4.0 before 29.0.0 — fixed in 29.0.0
• Cloud Foundry Routing: from 0.262.0 before 0.266.0 — fixed in 0.266.0

How to fix

Upgrade to a fixed version: Cloud Foundry cf-deployment 29.0.0; Cloud Foundry Routing 0.266.0. Check the vendor advisory for mitigations.

References

• https://www.cloudfoundry.org/blog/cve-2023-20882-gorouter-pruning-via-client-disconnect-resulting-in-dos/
• https://www.cloudfoundry.org/blog/cve-2023-20882-gorouter-pruning-via-client-disconnect-resulting-in-dos/

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