Is CVE-2026-120189 exploited in the wild?

No. Junglewise Threat Intelligence has no report of CVE-2026-120189 being exploited in the wild.

How severe is CVE-2026-120189?

Critical severity, with a CVSS score of 10, published 1 November 2026.

Is there a fix for CVE-2026-120189?

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-2026-120189 attacked?

It is attacked over the network, in a network appliance.

Am I affected by CVE-2026-120189?

Check whether you run D-Link DIR-505 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.

CVE-2026-120189: D-Link DIR-505 stack-based buffer overflow in TFTP upload handler

CVE-2026-120189 · Severity: critical · CVSS 10 · Published 2026-11-01

The D-Link DIR-505 router's TFTP upload filename handler contains a stack-based buffer overflow vulnerability that allows remote attackers to crash the device or execute arbitrary code. An attacker can exploit this flaw by sending a specially crafted filename during a TFTP upload, potentially gaining complete control over the router without authentication. Exploit code is publicly available and the vulnerability has a critical severity rating.

Vendors: D-Link.

Quick answers

Is CVE-2026-120189 exploited in the wild?: No. Junglewise Threat Intelligence has no report of CVE-2026-120189 being exploited in the wild.
How severe is CVE-2026-120189?: Critical severity, with a CVSS score of 10, published 1 November 2026.
Which products and versions are affected?: D-Link DIR-505 1.10B02.
Is there a fix for CVE-2026-120189?: 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-2026-120189 attacked?: It is attacked over the network, in a network appliance.
Am I affected by CVE-2026-120189?: Check whether you run D-Link DIR-505 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

A stack-based buffer overflow exists in the save_upload_file/mp_upload_file function of /usr/bin/tftpd in the TFTP Upload Filename Handler component. The vulnerability is triggered by manipulation of the filename parameter during a TFTP file upload operation and is exploitable remotely without authentication. Attackers can leverage this to achieve remote code execution and potentially full system compromise.

Affected products

D-Link DIR-505 1.10B02

Timeline

2026-11-01: disclosed
other: Exploit code publicly available

References

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