---
id: "CVE-2021-36380"
kind: "vulnerability"
aliases: ["CVE-2021-36380"]
title: "Sunhillo SureLine before 8.7.0.1.1 allows Unauthenticated OS Command Injection via shell metacharacters in ipAddr or\u2026"
severity: "critical"
cvss: 10.0
epss: null
exploited: true
status: "open"
category: "infrastructure"
products: [{"name": "sunhillo sureline", "fixed": ["8.7.0.1.1"], "affected": "< 8.7.0.1.1", "ecosystem": "vendor"}, {"name": "Sunhillo SureLine", "fixed": [], "affected": "", "ecosystem": "vendor"}]
ecosystems: ["vendor"]
tags: ["exploited", "infrastructure", "network-appliance", "sunhillo", "sureline"]
not_affected_if: ["unknown"]
published_at: "2021-08-13T16:15:07+00:00"
first_seen_at: "2026-10-23T19:11:51+00:00"
updated_at: "2026-10-24T00:09:51+00:00"
sources: [{"source": "kev", "url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog?search_api_fulltext=CVE-2021-36380", "first_seen_at": "2026-10-23T19:11:51+00:00"}, {"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2021-36380", "first_seen_at": "2026-10-23T22:29:05+00:00"}]
---

# Sunhillo SureLine before 8.7.0.1.1 allows Unauthenticated OS Command Injection via shell metacharacters in ipAddr or…

Sunhillo SureLine appliances have an OS command injection flaw in the networkDiag.cgi page, where shell metacharacters in the ipAddr or dnsAddr parameters are passed to the shell. An attacker can use it to crash the device or keep a foothold on the network.

_Summary, check and fix written by a model from the sources; labelled as such._

## Affected

- vendor:sunhillo sureline affected < 8.7.0.1.1 fixed 8.7.0.1.1
- vendor:Sunhillo SureLine affected ? fixed ?

## Fix

Apply the vendor mitigations per CISA guidance, or discontinue use of the product if no mitigation is available.

## Timeline

- 2026-10-23T19:11:51+00:00 kev https://www.cisa.gov/known-exploited-vulnerabilities-catalog?search_api_fulltext=CVE-2021-36380
- 2026-10-23T22:29:05+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2021-36380

## From the sources

Sunhillo SureLine contains an OS command injection vulnerability that allows an attacker to cause a denial-of-service or utilize the device for persistence on the network via shell metacharacters in ipAddr or dnsAddr in /cgi/networkDiag.cgi.

CISA required action: Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.

---

_Free to read at a human pace. An API with keys and an MCP server are in preparation; early access: hello@infrastack.ai_