# CVE-2026-85223: D-Link DNS-340L OS command injection in dropbox.cgi

Source: https://junglewise.ai/threats/cve-2026-85223-d-link-dns-340l-os-command-injection-in-dropbox-cgi  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-09-03. Updated: 2026-09-25  
License: CC BY 4.0 with a link back

CVE-2026-85223 · Severity: critical · CVSS 9.9 · Published 2026-09-03

D-Link DNS-340L is a network-attached storage device. A remote attacker can inject arbitrary operating system commands through the dropbox.cgi web interface by manipulating the callback_url or sync_interval parameters, potentially gaining complete control of the device and accessing all stored data.

Technologies: [D-Link DNS-340L](https://junglewise.ai/threats/technologies/dns-340l). Vendors: [D-Link](https://junglewise.ai/threats/vendors/d-link).

## Quick answers

**Is CVE-2026-85223 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-85223 being exploited in the wild.

**How severe is CVE-2026-85223?** Critical severity, with a CVSS score of 9.9, published 3 September 2026.

**Which products and versions are affected?** D-Link DNS-340L 1.01B04.

**Is there a fix for CVE-2026-85223?** No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

**How is CVE-2026-85223 attacked?** It is attacked over the network, in a network appliance.

**Am I affected by CVE-2026-85223?** Check whether you run D-Link DNS-340L at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Technical details

This is an OS command injection vulnerability in the CGI Handler component of D-Link DNS-340L firmware version 1.01B04. The vulnerable endpoint /cgi-bin/dropbox.cgi fails to properly sanitize user-supplied input in the callback_url and sync_interval parameters before passing them to system commands. The attack is network-reachable and requires no authentication. An attacker can execute arbitrary shell commands with the privileges of the web server process, typically leading to full device compromise. A public exploit exists for this vulnerability.

## Affected products

- D-Link DNS-340L 1.01B04

## Timeline

- 2026-09-03: disclosed
- other: Exploit made public

## References

- [https://github.com/dxz0069/WAVLINK-WN530H4-Command-Injection-in-set_add_routing/blob/main/DLINK-CMD-008-vulndb.md](https://github.com/dxz0069/WAVLINK-WN530H4-Command-Injection-in-set_add_routing/blob/main/DLINK-CMD-008-vulndb.md)
- [https://vuldb.com/cve/CVE-2026-85223](https://vuldb.com/cve/CVE-2026-85223)

## Related threats

- [D-Link DNS-340L OS command injection in addon_center.cgi](https://junglewise.ai/threats/cve-2026-85222-d-link-dns-340l-os-command-injection-in-addon-center-cgi)
- [D-Link DNS-340L and DNS-345 OS command injection in iscsi_mgr.cgi](https://junglewise.ai/threats/cve-2026-82692-d-link-dns-340l-and-dns-345-os-command-injection-in-iscsi-mgr-cgi)
- [D-Link DNS-320L DNS-327L DNS-340L DNS-345 OS command injection in CGI handler](https://junglewise.ai/threats/cve-2026-82691-d-link-dns-320l-dns-327l-dns-340l-dns-345-os-command-injection-in)
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- [D-Link DNS ShareCenter OS command injection in isomount_mgr.cgi](https://junglewise.ai/threats/cve-2026-82689-d-link-dns-sharecenter-os-command-injection-in-isomount-mgr-cgi)