# CVE-2026-78050: Comfast CF-N1-S stack buffer overflow in NTP timezone configuration

Source: https://junglewise.ai/threats/cve-2026-78050-comfast-cf-n1-s-stack-buffer-overflow-in-ntp-timezone  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-08-23. Updated: 2026-09-25  
License: CC BY 4.0 with a link back

CVE-2026-78050 · Severity: critical · CVSS 9.9 · Published 2026-08-23

Comfast CF-N1-S is a WiFi router with a web-based management interface. A stack buffer overflow vulnerability in the NTP timezone settings allows a remote attacker with network access to send a malicious HTTP request and execute arbitrary code on the device, potentially compromising all traffic routed through it or enabling lateral movement into the network.

Technologies: [Comfast CF-N1-S](https://junglewise.ai/threats/technologies/cf-n1-s). Vendors: [Comfast](https://junglewise.ai/threats/vendors/comfast).

## Quick answers

**Is CVE-2026-78050 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-78050 being exploited in the wild.

**How severe is CVE-2026-78050?** Critical severity, with a CVSS score of 9.9, published 23 August 2026.

**Which products and versions are affected?** Comfast CF-N1-S 2.6.0.1.

**Is there a fix for CVE-2026-78050?** 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-2026-78050 attacked?** It is attacked over the network, in device firmware.

**Am I affected by CVE-2026-78050?** Check whether you run Comfast CF-N1-S 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 in the sub_41AD7C function of the web management endpoint /cgi-bin/mbox-config?method=SET&section=ntp_timezone. The function accepts a 'timestr' parameter via JSON POST body and passes it unsanitized to sprintf(), which concatenates it with the format string "date -s \"%s\" > /dev/null" before writing to a fixed-size stack buffer. No bounds checking occurs, allowing an attacker to overwrite the return address with a long timestr value. The attack requires network reachability to the router's web interface (typically requires a valid session or unauthenticated access depending on configuration). Proof-of-concept code has been publicly disclosed, and exploit code is available.

## Affected products

- Comfast CF-N1-S 2.6.0.1

## Timeline

- 2026-07-06: disclosed: Vulnerability report published on GitHub
- 2026-08-23: advisory: CVE-2026-78050 published

## References

- [https://github.com/AdminSafe/CVE/issues/9](https://github.com/AdminSafe/CVE/issues/9)
- [https://vuldb.com/cve/CVE-2026-78050](https://vuldb.com/cve/CVE-2026-78050)

## Related threats

- [Comfast CF-N1-S stack-based buffer overflow in web management](https://junglewise.ai/threats/cve-2026-94003-a-vulnerability-has-been-found-in-comfast-cf-n1-s-2-6-0-1)
- [Comfast CF-N1-S command injection in webmgnt](https://junglewise.ai/threats/cve-2026-75364-comfast-cf-n1-s-command-injection-in-webmgnt)
- [Comfast CF-N1-S command injection in NTP timezone](https://junglewise.ai/threats/cve-2026-77683-comfast-cf-n1-s-command-injection-in-ntp-timezone)
- [Comfast CF-N1-S stack-based buffer overflow in web management](https://junglewise.ai/threats/cve-2026-77148-comfast-cf-n1-s-stack-based-buffer-overflow-in-web-management)
- [Comfast CF-N1-S stack-based buffer overflow in SSID configuration](https://junglewise.ai/threats/cve-2026-77022-comfast-cf-n1-s-stack-based-buffer-overflow-in-ssid-configuration)