# CVE-2026-36356

> As of 2026-07-05, CVE-2026-36356 is a CRITICAL-severity vulnerability, CVSS v3.1 9.1, EPSS 3.5% (89.0th percentile). Threadlinqs Intelligence links 2 tracked threat campaigns to CVE-2026-36356, most recently “ClingSTUN Linux Backdoor Turns Unpatched IoT Devices Into Proxy Nodes via Public STUN Infrastructure”.

**Last updated:** 2026-07-05

## What is CVE-2026-36356?

The GoAhead web server on MeiG Smart FORGE_SLT711 devices (firmware MDM9607.LE.1.0-00110-STD.PROD-1) allows unauthenticated OS command injection via the /action/SetRemoteAccessCfg endpoint.

The record classifies CVE-2026-36356 under weakness classes [CWE-78](https://intel.threadlinqs.com/cwe/CWE-78), [CWE-306](https://intel.threadlinqs.com/cwe/CWE-306). 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. The identifier was first published 172 days ago.

## Severity and exploitation probability

- **CVSS v3.1 base score:** 9.1 — CRITICAL (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N`)
- **EPSS (FIRST):** 3.5% probability of exploitation in the next 30 days, higher than 89.0% of all scored CVEs
- **CISA KEV:** Not listed in the CISA Known Exploited Vulnerabilities catalog
- **Threadlinqs priority:** 10/10 — a Threadlinqs composite of the CVSS base score, the EPSS percentile and public exploit availability
- **Published:** 2026-05-05, last modified 2026-07-05

## Is CVE-2026-36356 being exploited?

Weaponised exploit code for CVE-2026-36356 is publicly available. 2 public proof-of-concept repositories are tracked for this identifier. It currently carries a trending score of 40 in the Threadlinqs vulnerability feed.

- [totekuh/CVE-2026-36356](https://github.com/totekuh/CVE-2026-36356) (github)
- [trickest/cve](https://github.com/trickest/cve/blob/main/2026/CVE-2026-36356.md) (trickest)

## Affected products and versions

No affected-product or package list has been recorded for CVE-2026-36356 in the tracked sources. The vendor advisory and the references below are the authoritative statement of what is affected.

## How to fix CVE-2026-36356

No vendor patch reference has been recorded for CVE-2026-36356 in the tracked sources. Follow the references below for a fix, and treat any affected deployment as exposed until the vendor states otherwise.

## Threat activity tracking CVE-2026-36356

2 tracked threats in the Threadlinqs corpus reference CVE-2026-36356, either in the campaign’s CVE list or as an indicator on the campaign record.

- [ClingSTUN Linux Backdoor Turns Unpatched IoT Devices Into Proxy Nodes via Public STUN Infrastructure](https://intel.threadlinqs.com/threat/TL-2026-2934) — HIGH · 2026-10-05
- [Cling IoT botnet masquerades as Google STUN traffic for C2, exploiting Realtek Jungle SDK CVE-2021-35394](https://intel.threadlinqs.com/threat/TL-2026-2857) — CRITICAL · 2026-10-03

## Sources

Enriched from CVE.org, FIRST EPSS, GitHub Security Advisories, public proof-of-concept repositories. Last verified by Threadlinqs on 2026-10-10.

**Other references**

- [github.com](https://github.com/totekuh/CVE-2026-36356)

Canonical: https://intel.threadlinqs.com/cve/CVE-2026-36356
Full detection coverage and IOCs for threats exploiting CVE-2026-36356 via the Threadlinqs MCP server (Purple tier): https://intel.threadlinqs.com/mcp