# CVE-2025-50666: D-Link DI-8003 buffer overflow in /web_post.asp

Source: https://junglewise.ai/threats/cve-2025-50666-d-link-di-8003-buffer-overflow-in-web-post-asp  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-04-08. Updated: 2026-07-25  
License: CC BY 4.0 with a link back

CVE-2025-50666 · Severity: high · CVSS 7.5 · Published 2026-04-08

A security vulnerability has been identified in the D-Link DI-8003 router that could allow an attacker to crash the device. By sending a specially crafted web request, an attacker can cause the system to become unresponsive, leading to a total loss of internet connectivity and network services. Because this product has reached its end-of-life status, the manufacturer will not be releasing a fix, and it is recommended that the hardware be replaced.

Technologies: [Dlink Di-8003](https://junglewise.ai/threats/technologies/di-8003), [Dlink Di-8003 Firmware](https://junglewise.ai/threats/technologies/di-8003-firmware). Vendors: [Dlink](https://junglewise.ai/threats/vendors/dlink).

## Quick answers

**Is CVE-2025-50666 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2025-50666 being exploited in the wild.

**How severe is CVE-2025-50666?** High severity, with a CVSS score of 7.5, published 8 April 2026.

**Which products and versions are affected?** D-Link DI-8003 16.07.26A1.

**Is there a fix for CVE-2025-50666?** 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-2025-50666 attacked?** It is attacked over the network, in a network appliance.

**Am I affected by CVE-2025-50666?** Check whether you run Dlink Di-8003 or Dlink Di-8003 Firmware. 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 classic buffer overflow (CWE-120) exists in the D-Link DI-8003 router, specifically within the firmware version 16.07.26A1. The vulnerability is located in the '/web_post.asp' endpoint due to improper length validation of multiple parameters, including 'name', 'en', 'user_id', 'log', and 'time'. An unauthenticated attacker can trigger this overflow by sending a crafted HTTP GET request containing excessively long strings in these parameters. Successful exploitation leads to a denial-of-service (DoS) condition. As the DI-8003 is an End-of-Life (EoL) product, D-Link has stated that no firmware updates will be provided to address this issue.

## Affected products

- D-Link DI-8003 16.07.26A1

## Timeline

- 2026-04-08: disclosed: Initial disclosure of the vulnerability.
- 2026-04-15: advisory: D-Link published a security announcement confirming the EoL status and lack of patches.

## References

- [https://github.com/xiaotea/iot-vulnerability-collection/blob/main/README.md](https://github.com/xiaotea/iot-vulnerability-collection/blob/main/README.md)
- [https://supportannouncement.us.dlink.com/security/publication.aspx?name=SAP10505](https://supportannouncement.us.dlink.com/security/publication.aspx?name=SAP10505)
- [https://www.dlink.com/en/security-bulletin/](https://www.dlink.com/en/security-bulletin/)

## Related threats

- [D-Link DI-8003 buffer overflow in /webgl.asp](https://junglewise.ai/threats/cve-2025-50673-d-link-di-8003-buffer-overflow-in-webgl-asp)
- [D-Link DI-8003 buffer overflow in /yyxz_dlink.asp](https://junglewise.ai/threats/cve-2025-50672-d-link-di-8003-buffer-overflow-in-yyxz-dlink-asp)
- [D-Link DI-8003 buffer overflow in /xwgl_ref.asp](https://junglewise.ai/threats/cve-2025-50671-d-link-di-8003-buffer-overflow-in-xwgl-ref-asp)
- [D-Link DI-8003 buffer overflow in /xwgl_bwr.asp](https://junglewise.ai/threats/cve-2025-50670-d-link-di-8003-buffer-overflow-in-xwgl-bwr-asp)
- [D-Link DI-8003 buffer overflow in wan_ping.asp](https://junglewise.ai/threats/cve-2025-50669-d-link-di-8003-buffer-overflow-in-wan-ping-asp)