# CVE-2026-7853: D-Link DI-8100 buffer overflow in /auto_reboot.asp

Source: https://junglewise.ai/threats/cve-2026-7853-d-link-di-8100-buffer-overflow-in-auto-reboot-asp  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-05-05. Updated: 2026-07-24  
License: CC BY 4.0 with a link back

CVE-2026-7853 · Severity: critical · CVSS 9.8 · Published 2026-05-05

A critical security vulnerability has been identified in the D-Link DI-8100 router, a device used for managing network connectivity. An attacker can remotely exploit this flaw to crash the router or potentially take full control of the device. This could lead to unauthorized access to sensitive data, redirection of internet traffic, or a complete loss of internet service for the affected network.

Technologies: [Dlink Di-8100](https://junglewise.ai/threats/technologies/di-8100), [Dlink Di-8100 Firmware](https://junglewise.ai/threats/technologies/di-8100-firmware). Vendors: [Dlink](https://junglewise.ai/threats/vendors/dlink).

## Quick answers

**Is CVE-2026-7853 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-7853 being exploited in the wild.

**How severe is CVE-2026-7853?** Critical severity, with a CVSS score of 9.8, published 5 May 2026.

**Which products and versions are affected?** D-Link DI-8100 16.07.26A1.

**Is there a fix for CVE-2026-7853?** 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-2026-7853 attacked?** It is attacked over the network, in a network appliance.

**Am I affected by CVE-2026-7853?** Check whether you run Dlink Di-8100 or Dlink Di-8100 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 stack-based buffer overflow (CWE-120) exists in the HTTP Handler component of the D-Link DI-8100 router, specifically within the auto_reboot_asp function (address 0x0042a180). The vulnerability is caused by the unsafe use of the sprintf() function when processing the 'enable' and 'time' parameters retrieved from NVRAM. Because these parameters are derived from user-controlled HTTP POST requests to /auto_reboot.asp without length validation, an attacker can provide overly long strings that overwrite the stack buffer (acStack_90). This can lead to the corruption of the function's return address, enabling remote code execution (RCE) or a crash of the jhttpd daemon. Public exploit code is available.

## Affected products

- D-Link DI-8100 16.07.26A1

## Timeline

- 2026-05-05: disclosed: Vulnerability disclosed and CVE assigned
- 2026-05-05: advisory: Initial advisory published by VulDB

## References

- [https://github.com/draw-ctf/report/blob/main/DI-8100/auto_reboot_asp_overflow.md](https://github.com/draw-ctf/report/blob/main/DI-8100/auto_reboot_asp_overflow.md)
- [https://vuldb.com/submit/807837](https://vuldb.com/submit/807837)
- [https://vuldb.com/vuln/361130](https://vuldb.com/vuln/361130)
- [https://vuldb.com/vuln/361130/cti](https://vuldb.com/vuln/361130/cti)
- [https://www.dlink.com/](https://www.dlink.com/)

## Related threats

- [D-Link DI-8100 buffer overflow in user_group.asp CGI handler](https://junglewise.ai/threats/cve-2026-7857-d-link-di-8100-buffer-overflow-in-user-group-asp-cgi-handler)
- [D-Link DI-8100 stack buffer overflow in url_member.asp](https://junglewise.ai/threats/cve-2026-7856-d-link-di-8100-stack-buffer-overflow-in-url-member-asp)
- [D-Link DI-8100 buffer overflow in tggl_asp function](https://junglewise.ai/threats/cve-2026-7855-d-link-di-8100-buffer-overflow-in-tggl-asp-function)
- [D-Link DI-8100 buffer overflow in url_rule.asp](https://junglewise.ai/threats/cve-2026-7854-d-link-di-8100-buffer-overflow-in-url-rule-asp)
- [D-Link DI-8100 stack-based buffer overflow in yyxz.asp](https://junglewise.ai/threats/cve-2026-7851-d-link-di-8100-stack-based-buffer-overflow-in-yyxz-asp)