---
id: "CVE-2026-123961"
page: "https://infrastack.ai/live/CVE-2026-123961"
kind: "vulnerability"
aliases: ["CVE-2026-123961"]
title: "TOTOLINK CA300-PoE: Wi-Fi setup flaw lets remote attackers overflow memory"
severity: "critical"
cvss: 9.9
epss: null
exploited: false
status: "open"
category: "infrastructure"
products: [{"name": "CA300-PoE", "fixed": [], "affected": "6.2c.884", "ecosystem": "totolink"}]
ecosystems: []
tags: ["ca300-poe", "firmware", "infrastructure", "totolink", "wifi-access-point"]
not_affected_if: []
published_at: "2026-11-07T11:17:01+00:00"
first_seen_at: "2026-11-07T11:46:53+00:00"
updated_at: "2026-11-07T11:49:34+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-123961", "first_seen_at": "2026-11-07T11:46:53+00:00"}, {"source": "analyst", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-123961", "first_seen_at": "2026-11-07T11:49:34+00:00", "cites": ["https://nvd.nist.gov/vuln/detail/CVE-2026-123961", "https://www.rapid7.com/db/vulnerabilities/cve-2026-123961/"]}]
exploit_sources: []
---

# TOTOLINK CA300-PoE: Wi-Fi setup flaw lets remote attackers overflow memory

Link for people: https://infrastack.ai/live/CVE-2026-123961 (this .md is for agents)

The TOTOLINK CA300-PoE firmware version 6.2c.884 has a buffer overflow in the setWiFiBasicConfig function of /cgi-bin/cstecgi.cgi, triggered by the KeyStr argument. The sources say an attacker may trigger it remotely, and a public exploit has been disclosed.

_Summary, check and fix written by a model from the sources; labelled as such._

## Affected

- totolink:CA300-PoE affected 6.2c.884 fixed no fixed version listed

## How to check

- Check the firmware version in the device's web admin page; 6.2c.884 is the only version named as affected. Other versions are not tested or ruled out in the sources.
- Check whether the web management interface (/cgi-bin/cstecgi.cgi) is reachable from the internet or from untrusted networks, and restrict it to a management network.
- No fixed firmware is listed in the sources. Check the CA300-PoE download page at totolink.net for newer firmware.

## Timeline

- 2026-11-07T11:46:53+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-123961
- 2026-11-07T11:49:34+00:00 analyst https://nvd.nist.gov/vuln/detail/CVE-2026-123961 — Only NVD/CVE record text found (via VulDB CNA); no TOTOLINK advisory, no fixed firmware, no PoC link located. Auth requirement unclear (CVSS PR:L). Fix status left unknown, nothing verified. X not checked.

## Documents

- [advisory] NVD CVE-2026-123961 https://nvd.nist.gov/vuln/detail/CVE-2026-123961
- [mentions] Rapid7 CVE-2026-123961 https://www.rapid7.com/db/vulnerabilities/cve-2026-123961/

## From the sources

A security vulnerability has been detected in TOTOLINK CA300-PoE 6.2c.884. This impacts the function setWiFiBasicConfig of the file /cgi-bin/cstecgi.cgi. The manipulation of the argument KeyStr leads to buffer overflow. The attack may be initiated remotely. The exploit has been disclosed publicly and may be used.

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_Free to read, with fair use of about 60 pages a minute. For higher limits or API access: sales@infrastack.ai_