Quick answers
- Is CVE-2026-76869 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-76869 being exploited in the wild.
- How severe is CVE-2026-76869?
- High severity, with a CVSS score of 7.2, published 15 September 2026.
- Which products and versions are affected?
- Netcore NR255-V 1.5.130703.
- Is there a fix for CVE-2026-76869?
- 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-2026-76869 attacked?
- It is attacked over the network.
- Am I affected by CVE-2026-76869?
- 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
A stack-based buffer overflow (CWE-121) exists in the reboot_timer_set.cgi endpoint, caused by improper sscanf token parsing that fails to validate input length before writing to a fixed-size stack buffer. The vulnerability is network-accessible but requires authentication (administrator privileges) to trigger. An attacker with valid credentials can send crafted POST/GET requests to the vulnerable endpoint to overwrite the stack, potentially achieving arbitrary code execution on the router. A patch or firmware update from Netcore has not been announced as of the advisory publication date.
Affected products
- Netcore NR255-V 1.5.130703
Timeline
- 2026-09-15: disclosed: CVE-2026-76869 published
- 2026-08-19: other: Public research disclosure on GitHub