# CVE-2026-79911 — TOTOLINK N600R

> As of 2026-08-25, CVE-2026-79911 is a CRITICAL-severity vulnerability in TOTOLINK N600R, CVSS v3.1 10, EPSS 0.6% (48.2th percentile). No Threadlinqs-tracked threat campaign has been attributed to CVE-2026-79911 as of 2026-08-25; the identifier is re-checked against the Threadlinqs threat corpus on every daily ingest.

**Last updated:** 2026-08-25

## What is CVE-2026-79911?

A security vulnerability has been detected in TOTOLINK N600R 4.3.0cu.7647_B20210106. The affected element is the function setSystemConfig of the file /cgi-bin/cstecgi.cgi of the component CGI Handler. Such manipulation of the argument Hostname leads to stack-based buffer overflow. It is possible to launch the attack remotely. The exploit has been disclosed publicly and may be used.

The record classifies CVE-2026-79911 under weakness classes [CWE-121](https://intel.threadlinqs.com/cwe/CWE-121), [CWE-119](https://intel.threadlinqs.com/cwe/CWE-119). Its CVSS v3 base vector states that the flaw is reachable remotely over the network, needs no prior authentication, needs no user interaction, and has high impact on confidentiality, integrity, availability. 1 affected-product entry is recorded, across 1 vendor, listed below. The identifier was first published 41 days ago.

## Severity and exploitation probability

- **CVSS v3.1 base score:** 10 — CRITICAL (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H/E:P/RL:X/RC:R`)
- **CVSS v4.0 base score:** 10 (`CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H/E:P`)
- **EPSS (FIRST):** 0.6% probability of exploitation in the next 30 days, higher than 48.2% of all scored CVEs
- **CISA KEV:** Not listed in the CISA Known Exploited Vulnerabilities catalog
- **Threadlinqs priority:** 6.9/10 — a Threadlinqs composite of the CVSS base score, the EPSS percentile and public exploit availability
- **Published:** 2026-08-25

## Is CVE-2026-79911 being exploited?

It currently carries a trending score of 42 in the Threadlinqs vulnerability feed.

## Affected products and versions

- **TOTOLINK**: N600R

## How to fix CVE-2026-79911

No vendor patch reference has been recorded for CVE-2026-79911 in the tracked sources. Follow the references below for a fix, and treat the products listed above as exposed until the vendor states otherwise.

## Threat activity tracking CVE-2026-79911

No threat campaign in the Threadlinqs corpus currently references CVE-2026-79911, in its CVE list or as an indicator. The linkage is recomputed from the live corpus on every daily ingest, so this section fills in as soon as a tracked campaign cites the identifier.

## Sources

Enriched from CVE.org, GitHub Security Advisories, FIRST EPSS. Last verified by Threadlinqs on 2026-08-26.

**Exploit and proof of concept**

- [github.com — exploit](https://github.com/dxz0069/WAVLINK-WN530H4-Command-Injection-in-set_add_routing/blob/main/TOTOLINK_N600R_cstecgi_strcpy_sprintf_Multi_Function_Stack_Overflow.md)

**Technical analysis**

- [vuldb.com — vdb entry](https://vuldb.com/vuln/395061)

**Third-party advisory**

- [vuldb.com — signature](https://vuldb.com/vuln/395061/cti)
- [vuldb.com — third party advisory](https://vuldb.com/cve/CVE-2026-79911)
- [vuldb.com — third party advisory (881258)](https://vuldb.com/submit/881258)

**Issue tracking and product pages**

- [totolink.net — product](https://www.totolink.net/)

Canonical: https://intel.threadlinqs.com/cve/CVE-2026-79911
Full detection coverage and IOCs for threats exploiting CVE-2026-79911 via the Threadlinqs MCP server (Purple tier): https://intel.threadlinqs.com/mcp