# CVE-2026-76860: Netcore NR255-V stack-based buffer overflow in wake_up_set.cgi

Source: https://junglewise.ai/threats/cve-2026-76860-netcore-nr255-v-stack-based-buffer-overflow-in-wake-up-set-cgi  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-09-15. Updated: 2026-09-26  
License: CC BY 4.0 with a link back

CVE-2026-76860 · Severity: high · CVSS 8.8 · Published 2026-09-15

Netcore NR255-V is a consumer router that provides Wake-on-LAN and other management features. The wake_up_set.cgi endpoint fails to properly validate user-supplied MAC and ID parameters, allowing attackers with login access to overflow the router's memory and potentially execute arbitrary code, compromising the device's security and availability.

Technologies: [Netcore NR255-V](https://junglewise.ai/threats/technologies/nr255-v). Vendors: [Netcore](https://junglewise.ai/threats/vendors/netcore).

## Quick answers

**Is CVE-2026-76860 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-76860 being exploited in the wild.

**How severe is CVE-2026-76860?** High severity, with a CVSS score of 8.8, published 15 September 2026.

**Which products and versions are affected?** Netcore NR255-V 1.5.130703.

**Is there a fix for CVE-2026-76860?** 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-2026-76860 attacked?** It is attacked over the network, in a network appliance.

**Am I affected by CVE-2026-76860?** Check whether you run Netcore NR255-V 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

The vulnerability is a stack-based buffer overflow (CWE-121) in the wake_up_set.cgi endpoint caused by unbounded tokenization of MAC address and ID parameters. An authenticated attacker can supply crafted MAC and ID values that overflow an internal buffer and corrupt program memory, potentially leading to code execution or denial of service. The attack requires network access to the router and valid credentials; no user interaction is needed once authenticated. A patch is not yet publicly documented at the advisory publication date.

## Affected products

- Netcore NR255-V 1.5.130703

## Timeline

- 2026-09-15: disclosed
- 2026-08-19: other: Public technical reference published

## References

- [https://github.com/draw-ctf/netcore-router-public-refs/blob/main/2026.08.19-netcore-nr255v-wake-up-set-overflow.md](https://github.com/draw-ctf/netcore-router-public-refs/blob/main/2026.08.19-netcore-nr255v-wake-up-set-overflow.md)
- [https://www.vulncheck.com/advisories/netcore-nr255-v-1.5.130703-stack-based-buffer-overflow-in-wake-up-set-cgi-via-mac-and-id-tokenization](https://www.vulncheck.com/advisories/netcore-nr255-v-1.5.130703-stack-based-buffer-overflow-in-wake-up-set-cgi-via-mac-and-id-tokenization)

## Related threats

- [Netcore NR255-V stored cross-site scripting in L7 content management](https://junglewise.ai/threats/cve-2026-92257-netcore-nr255-v-stored-cross-site-scripting-in-l7-content)
- [Netcore NR255-V sensitive information disclosure in VPN configuration handlers](https://junglewise.ai/threats/cve-2026-92256-netcore-nr255-v-sensitive-information-disclosure-in-vpn)
- [Netcore NR255-V out-of-bounds read in filter_arp_put_file.cgi](https://junglewise.ai/threats/cve-2026-92255-netcore-nr255-v-out-of-bounds-read-in-filter-arp-put-file-cgi)
- [Netcore NR255-V stored cross-site scripting in DHCP and ARP hostname fields](https://junglewise.ai/threats/cve-2026-76873-netcore-nr255-v-stored-cross-site-scripting-in-dhcp-and-arp)
- [Netcore NR255-V stored cross-site scripting in DHCP and ACL management](https://junglewise.ai/threats/cve-2026-76872-netcore-nr255-v-stored-cross-site-scripting-in-dhcp-and-acl)