Is CVE-2026-77004 exploited in the wild?

No. Junglewise Threat Intelligence has no report of CVE-2026-77004 being exploited in the wild.

How severe is CVE-2026-77004?

High severity, with a CVSS score of 7.4, published 20 August 2026.

Is there a fix for CVE-2026-77004?

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-2026-77004 attacked?

It is attacked over the network, in a network appliance.

Am I affected by CVE-2026-77004?

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-2026-77004: Comfast CF-N1-S command injection in mbox-config

CVE-2026-77004 · Severity: high · CVSS 7.4 · Published 2026-08-20

The Comfast CF-N1-S is a networking device used in small business and residential deployments. A vulnerability in its web configuration interface allows remote attackers to inject arbitrary commands by manipulating request parameters, potentially leading to complete device compromise and network infiltration.

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

Quick answers

Is CVE-2026-77004 exploited in the wild?: No. Junglewise Threat Intelligence has no report of CVE-2026-77004 being exploited in the wild.
How severe is CVE-2026-77004?: High severity, with a CVSS score of 7.4, published 20 August 2026.
Which products and versions are affected?: Comfast CF-N1-S 2.6.0.1.
Is there a fix for CVE-2026-77004?: 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-2026-77004 attacked?: It is attacked over the network, in a network appliance.
Am I affected by CVE-2026-77004?: 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=ptest_sn) due to unsafe use of the sprintf function when processing the sn argument. The vulnerability is reached over the network without requiring authentication. An attacker can manipulate the sn parameter to inject shell commands that execute with device privileges. The exploit code has been publicly released.

Affected products

Comfast CF-N1-S 2.6.0.1

Timeline

2026-08-20: disclosed: Advisory published on NVD

References

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