# CVE-2025-34035 — EnGenius EnShare IoT Gigabit Cloud Service

> As of 2026-04-07, CVE-2025-34035 is a CRITICAL-severity vulnerability in EnGenius EnShare IoT Gigabit Cloud Service, CVSS v3.1 9.8, EPSS 22.8% (97.6th percentile). Threadlinqs Intelligence links 2 tracked threat campaigns to CVE-2025-34035, most recently “ClingSTUN Linux Backdoor Turns Unpatched IoT Devices Into Proxy Nodes via Public STUN Infrastructure”.

**Last updated:** 2026-04-07

## What is CVE-2025-34035?

An OS command injection vulnerability exists in EnGenius EnShare Cloud Service version 1.4.11 and earlier. The usbinteract.cgi script fails to properly sanitize user input passed to the path parameter, allowing unauthenticated remote attackers to inject arbitrary shell commands. The injected commands are executed with root privileges, leading to full system compromise. Exploitation evidence was observed by the Shadowserver Foundation on 2024-12-05 UTC.

The record classifies CVE-2025-34035 under weakness class [CWE-78](https://intel.threadlinqs.com/cwe/CWE-78). 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 487 days ago.

## Severity and exploitation probability

- **CVSS v3.1 base score:** 9.8 — CRITICAL (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H`)
- **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`)
- **EPSS (FIRST):** 22.8% probability of exploitation in the next 30 days, higher than 97.6% 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:** 2025-06-24, last modified 2026-04-07

## Is CVE-2025-34035 being exploited?

Weaponised exploit code for CVE-2025-34035 is publicly available. 1 public proof-of-concept repository is tracked for this identifier. A ProjectDiscovery Nuclei detection template exists (`http/cves/2025/CVE-2025-34035.yaml`). It currently carries a trending score of 44 in the Threadlinqs vulnerability feed.

- [trickest/cve](https://github.com/trickest/cve/blob/main/2025/CVE-2025-34035.md) (trickest)

## Affected products and versions

- **EnGenius**: EnShare IoT Gigabit Cloud Service

## How to fix CVE-2025-34035

No vendor patch reference has been recorded for CVE-2025-34035 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-2025-34035

2 tracked threats in the Threadlinqs corpus reference CVE-2025-34035, 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, NVD, FIRST EPSS, GitHub Security Advisories, public proof-of-concept repositories, ProjectDiscovery Nuclei. Last verified by Threadlinqs on 2026-10-10. This product uses the NVD API but is not endorsed or certified by the NVD.

**Exploit and proof of concept**

- [zeroscience.mk — third party advisory](https://www.zeroscience.mk/en/vulnerabilities/ZSL-2017-5413.php)
- [exploit-db.com — third party advisory](https://www.exploit-db.com/exploits/42114)
- [packetstormsecurity.com — third party advisory](https://packetstormsecurity.com/files/142792)
- [cxsecurity.com — third party advisory](https://cxsecurity.com/issue/WLB-2017060050)

**Third-party advisory**

- [vulncheck.com — third party advisory](https://vulncheck.com/advisories/engenius-enshare-iot-gigabit-cloud-service)

Canonical: https://intel.threadlinqs.com/cve/CVE-2025-34035
Full detection coverage and IOCs for threats exploiting CVE-2025-34035 via the Threadlinqs MCP server (Purple tier): https://intel.threadlinqs.com/mcp