---
id: "CVE-2026-120189"
kind: "vulnerability"
aliases: ["CVE-2026-120189"]
title: "D-Link DIR-505 router: remote stack overflow in TFTP upload handler"
severity: "critical"
cvss: 10.0
epss: null
exploited: false
status: "open"
category: "infrastructure"
products: [{"name": "DIR-505", "fixed": [], "affected": "1.10B02", "ecosystem": "vendor"}]
ecosystems: []
tags: ["d-link", "dir-505", "end-of-life", "firmware", "infrastructure", "router", "tftp"]
not_affected_if: ["other-firmware-versions", "tftp-unreachable"]
published_at: "2026-11-01T01:17:16+00:00"
first_seen_at: "2026-11-01T01:47:20+00:00"
updated_at: "2026-11-01T01:48:38+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-120189", "first_seen_at": "2026-11-01T01:47:20+00:00"}, {"source": "analyst", "url": null, "first_seen_at": "2026-11-01T01:48:38+00:00"}]
---

# D-Link DIR-505 router: remote stack overflow in TFTP upload handler

A stack-based buffer overflow in the TFTP upload filename handler of the D-Link DIR-505 router firmware (version 1.10B02) can be triggered remotely. The sources say a public exploit exists, so an attacker may be able to run code on the device.

_Summary, check and fix written by a model from the sources; labelled as such._

## Affected

- vendor:DIR-505 affected 1.10B02 fixed ?

## How to check

- Admin page > Status/Firmware: version 1.10B02 is the only version named as affected (other versions are untested, not cleared).
- Check whether the router's TFTP service (/usr/bin/tftpd, UDP 69) answers from the WAN or from untrusted LAN/Wi-Fi clients.
- Also check any DIR-505L or other units on the same firmware base; no source confirms them.

## Fix

No fix: D-Link ended support for the DIR-505 on 2018-01-31 and issues no firmware updates. Retire and replace the router; until then do not expose it to untrusted networks.

## Timeline

- 2026-11-01T01:47:20+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-120189
- 2026-11-01T01:48:38+00:00 analyst — No D-Link advisory for this CVE. Details from VulDB (CNA) and NVD: PoC said to be on GitHub (link not visible, not saved); not seen exploited. D-Link legacy page confirms DIR-505 EOL 2018-01-31, so fix=none (inferred from EOL, not a CVE-specific vendor statement). Nothing verified. Social search skipped.

## Documents

- [advisory] D-Link Legacy Products: DIR-505, last day of support 1/31/2018 https://legacy.us.dlink.com/pages/product.aspx?id=bfae1a942f86457cb0a75250b5364116
- [advisory] D-Link DIR-505 End of Support Notice http://legacyfiles.us.dlink.com/DIR-505/REVA/DIR-505_END_OF_SUPPORT_NOTICE.pdf
- [describes] VulDB VDB-429528: D-Link DIR-505 1.10B02 TFTP stack overflow https://vuldb.com/vuln/429528

## From the sources

A vulnerability was identified in D-Link DIR-505 1.10B02. Affected is the function save_upload_file/mp_upload_file of the file /usr/bin/tftpd of the component TFTP Upload Filename Handler. The manipulation leads to stack-based buffer overflow. The attack is possible to be carried out remotely. The exploit is publicly available and might be used.

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_Free to read at a human pace. An API with keys and an MCP server are in preparation; early access: hello@infrastack.ai_