Is CVE-2026-77683 exploited in the wild?

No. Junglewise Threat Intelligence has no report of CVE-2026-77683 being exploited in the wild.

How severe is CVE-2026-77683?

Critical severity, with a CVSS score of 9.9, published 21 August 2026.

Is there a fix for CVE-2026-77683?

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-2026-77683 attacked?

It is attacked over the network, in device firmware.

Am I affected by CVE-2026-77683?

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.

CVE-2026-77683: Comfast CF-N1-S command injection in NTP timezone

CVE-2026-77683 · Severity: critical · CVSS 9.9 · Published 2026-08-21

The Comfast CF-N1-S router's web management interface contains a command injection vulnerability in the NTP timezone configuration endpoint. An authenticated attacker can send a specially crafted request to execute arbitrary commands on the router with full system privileges, potentially allowing complete device compromise, data theft, or use as a pivot point for network attacks.

Technologies: Comfast CF-N1-S. Vendors: Comfast.

Quick answers

Is CVE-2026-77683 exploited in the wild?: No. Junglewise Threat Intelligence has no report of CVE-2026-77683 being exploited in the wild.
How severe is CVE-2026-77683?: Critical severity, with a CVSS score of 9.9, published 21 August 2026.
Which products and versions are affected?: Comfast CF-N1-S 2.6.0.1.
Is there a fix for CVE-2026-77683?: 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-2026-77683 attacked?: It is attacked over the network, in device firmware.
Am I affected by CVE-2026-77683?: 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

A command injection vulnerability exists in the /cgi-bin/mbox-config endpoint (method=SET&section=ntp_timezone) of the webmgnt component, specifically in function sub_41AD7C. The user-supplied timestr parameter is passed unsanitized through sprintf() into a system() call, allowing OS command injection. The vulnerability requires two conditions: the timestr field must be non-empty and ntp_client_enabled must equal "0". While the vulnerability requires an authenticated session, exploitation is straightforward via HTTP POST and results in unauthenticated remote code execution from the attacker's perspective once a session is established. Public exploit code is available.

Affected products

Comfast CF-N1-S 2.6.0.1

Timeline

2026-07-06: disclosed: Vulnerability reported on GitHub
2026-08-21: advisory: CVE-2026-77683 published on NVD

References

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