# CVE-2025-52222: D-Link DI-series routers buffer overflow in radius_asp

Source: https://junglewise.ai/threats/cve-2025-52222-d-link-di-series-routers-buffer-overflow-in-radius-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-2025-52222 · Severity: high · CVSS 7.5 · Published 2026-04-08

Multiple D-Link DI-series enterprise routers are affected by a security flaw that can be triggered remotely. By sending a specially crafted request to the device, an attacker can cause the router to crash or become unresponsive. This results in a total loss of network connectivity for all users and systems relying on the affected hardware.

## Quick answers

**Is CVE-2025-52222 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2025-52222 being exploited in the wild.

**How severe is CVE-2025-52222?** High severity, with a CVSS score of 7.5, published 8 April 2026.

**Which products and versions are affected?** D-Link DI-8003 v16.07.26A1; D-Link DI-8500 v16.07.26A1; D-Link DI-8003G v17.12.21A1; D-Link DI-8200G v17.12.20A1; and 5 more.

**Is there a fix for CVE-2025-52222?** 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-2025-52222 attacked?** It is attacked over the network, in a network appliance.

**Am I affected by CVE-2025-52222?** Check whether anything you run is named in the advisory. 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 radius_asp function of several D-Link DI-series router models. The vulnerability is triggered by failing to properly validate the length of input provided to several parameters, including rd_en, rd_auth, rd_acct, http_hadmin, http_hadminpwd, rd_key, and rd_ip. An unauthenticated remote attacker can exploit this by sending a crafted network request to the device's management interface. Successful exploitation results in a Denial of Service (DoS) condition, crashing the device and requiring a manual reboot to restore service. Affected firmware versions include v16.07.26A1, v17.12.21A1, and v17.12.20A1 depending on the specific hardware model.

## Affected products

- D-Link DI-8003 v16.07.26A1
- D-Link DI-8500 v16.07.26A1
- D-Link DI-8003G v17.12.21A1
- D-Link DI-8200G v17.12.20A1
- D-Link DI-8200 v16.07.26A1
- D-Link DI-8400 v16.07.26A1
- D-Link DI-8004w v16.07.26A1
- D-Link DI-8100 v16.07.26A1
- D-Link DI-8100G v17.12.20A1

## Timeline

- 2026-04-08: disclosed: Initial disclosure date
- 2026-04-08: advisory: NVD publication date

## References

- [https://github.com/xiaotea/iot-vulnerability-collection/blob/main/README.md](https://github.com/xiaotea/iot-vulnerability-collection/blob/main/README.md)
- [https://www.dlink.com/en/security-bulletin/](https://www.dlink.com/en/security-bulletin/)