---
title: "CVE-2026-120189: D-Link DIR-505 - Buffer Overflow"
description: "D-Link DIR-505 1.10B02 contains a stack-based buffer overflow caused by manipulation of the TFTP Upload Filename Handler in /usr/bin/tftpd, letting remote attackers execute arbitrary code, exploit requires remote access."
url: https://panop.io/threat-heartbeat/CVE-2026-120189/
---

# CVE-2026-120189 D-Link DIR-505 - Buffer Overflow

D-Link DIR-505 1.10B02 contains a stack-based buffer overflow caused by manipulation of the TFTP Upload Filename Handler in /usr/bin/tftpd, letting remote attackers execute arbitrary code, exploit requires remote access.

CVSS base score 10.0 /10

Critical

CISA KEV

Not listed

Public exploit

None known

Authentication

Not required

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-120189)

## Details

Type

Buffer Overflow

Impact

Remote Code Execution

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H

Published

1 November 2026

Updated

1 November 2026

Weakness

[CWE-119](https://cwe.mitre.org/data/definitions/119.html)

## Vendor fix

Update to the latest available version.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

## References

- [https://nvd.nist.gov/vuln/detail/CVE-2026-120189](https://nvd.nist.gov/vuln/detail/CVE-2026-120189)
- [https://vuldb.com/vuln/429528/cti](https://vuldb.com/vuln/429528/cti)
- [https://www.dlink.com/](https://www.dlink.com/)
- [https://github.com/Walnut1337/DIR-505\_filename\_rce/tree/main/poc](https://github.com/Walnut1337/DIR-505_filename_rce/tree/main/poc)
- [https://vuldb.com/cve/CVE-2026-120189](https://vuldb.com/cve/CVE-2026-120189)
- [https://vuldb.com/submit/1027185](https://vuldb.com/submit/1027185)
- [https://vuldb.com/vuln/429528](https://vuldb.com/vuln/429528)

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## What this record can't tell you

- Whether you run the affected software, and where
- Whether an attacker can actually reach and exploit it
- The misconfigurations that never get a CVE number
- What it would cost the business, ranked into what to fix first

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