CVE-2026-77022 Comfast CF-N1-S SSID Configuration mbox-config sub_44B438 stack-based overflow

Critical 9.4 Published 20 Aug 2026 Updated 21 Aug 2026

Remote attackers can trigger a stack-based buffer overflow in the SSID configuration interface to execute arbitrary code on Comfast CF-N1-S routers.

Exploited in the wild: Not known
Login needed: Any signed-in user
Attackable: Over the internet
Victim action needed: Not needed
Fix: None listed

What is CVE-2026-77022?

CVE-2026-77022 is a critical memory corruption vulnerability in Comfast CF-N1-S, published on 20 Aug 2026. Any signed-in user can exploit it over the network, with no action from the victim.

Official description

A security flaw has been discovered in Comfast CF-N1-S 2.6.0.1. Affected by this issue is the function sub_44B438 of the file /cgi-bin/mbox-config?method=SET&section=ptest_ssid of the component SSID Configuration. The manipulation of the argument ssid results in stack-based buffer overflow. The attack can be executed remotely. The exploit has been released to the public and may be used for attacks.

Weakness: CWE-121, CWE-119

Which versions are affected by CVE-2026-77022?

How do I fix CVE-2026-77022?

No fix has been published for CVE-2026-77022 yet. Limit exposure of the affected software until one is available.

Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.

Is CVE-2026-77022 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-77022 exists.

Sources

Also known as GHSA-5pr4-rqrw-x9qc.