# CVE-2022-36553

> As of 2024-08-03, CVE-2022-36553 is a vulnerability, EPSS 90.9% (99.8th percentile). Threadlinqs Intelligence links 2 tracked threat campaigns to CVE-2022-36553, most recently “ClingSTUN Linux Backdoor Turns Unpatched IoT Devices Into Proxy Nodes via Public STUN Infrastructure”.

**Last updated:** 2024-08-03

## What is CVE-2022-36553?

Hytec Inter HWL-2511-SS v1.05 and below was discovered to contain a command injection vulnerability via the component /www/cgi-bin/popen.cgi.

The identifier was first published 1517 days ago.

## Severity and exploitation probability

- **EPSS (FIRST):** 90.9% probability of exploitation in the next 30 days, higher than 99.8% of all scored CVEs
- **CISA KEV:** Not listed in the CISA Known Exploited Vulnerabilities catalog
- **Threadlinqs priority:** 6.5/10 — a Threadlinqs composite of the CVSS base score, the EPSS percentile and public exploit availability
- **Published:** 2022-08-29, last modified 2024-08-03

## Is CVE-2022-36553 being exploited?

Weaponised exploit code for CVE-2022-36553 is publicly available. 2 public proof-of-concept repositories are tracked for this identifier. A ProjectDiscovery Nuclei detection template exists (`http/cves/2022/CVE-2022-36553.yaml`). It currently carries a trending score of 45 in the Threadlinqs vulnerability feed.

- [0xNslabs/CVE-2022-36553-PoC](https://github.com/0xNslabs/CVE-2022-36553-PoC) (github)
- [trickest/cve](https://github.com/trickest/cve/blob/main/2022/CVE-2022-36553.md) (trickest)

## Affected products and versions

No affected-product or package list has been recorded for CVE-2022-36553 in the tracked sources. The vendor advisory and the references below are the authoritative statement of what is affected.

## How to fix CVE-2022-36553

No vendor patch reference has been recorded for CVE-2022-36553 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-2022-36553

2 tracked threats in the Threadlinqs corpus reference CVE-2022-36553, 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, public proof-of-concept repositories, ProjectDiscovery Nuclei. Last verified by Threadlinqs on 2026-10-10.

**Other references**

- [hytec.co.jp](https://hytec.co.jp/eng/products/our-brand/hwl-2511-ss.html)
- [hytec.co.jp (hwl 2511 ss ds.3.0)](https://hytec.co.jp/eng/wordpress/wp-content/uploads/2019/09/hwl-2511-ss-ds.3.0.pdf)
- [gist.github.com](https://gist.github.com/Nwqda/b27418ab801eb0b9cdbe8d042cb0249b)

Canonical: https://intel.threadlinqs.com/cve/CVE-2022-36553
Full detection coverage and IOCs for threats exploiting CVE-2022-36553 via the Threadlinqs MCP server (Purple tier): https://intel.threadlinqs.com/mcp