PatchSiren cyber security CVE debrief
CVE-2016-20096 Kunshi Network Technology Co., Ltd. CVE debrief
CVE-2016-20096 is a critical SQL injection vulnerability in Linknat VOS3000 and VOS2009 through version 2.1.2.0. The vulnerability 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. Security teams should take immediate action to remediate this vulnerability.
- Vendor
- Kunshi Network Technology Co., Ltd.
- Product
- Linknat VOS3000
- CVSS
- CRITICAL 9.3
- CISA KEV
- Not listed in stored evidence
- Original CVE published
- 2026-07-21
- Original CVE updated
- 2026-07-22
- Advisory published
- 2026-07-21
- Advisory updated
- 2026-07-22
Who should care
Security teams and administrators responsible for Linknat VOS3000 and VOS2009 systems should be aware of this critical vulnerability and take immediate action to remediate it. They should review system versions, assess exposure, and implement necessary security controls.
Technical summary
The vulnerability is caused by a lack of proper input validation in the login endpoint of Linknat VOS3000 and VOS2009. An attacker can inject malicious SQL code by manipulating the name parameter in a POST request, allowing them to execute arbitrary SQL commands and potentially extract sensitive data. This critical vulnerability affects systems up to version 2.1.2.0. Security teams should review system versions, assess exposure, and implement necessary security controls. The CVE record and NVD details provide evidence for defenders to verify system versions and exposure. Defenders should also check relevant monitoring, detection, and logs for exposed assets that need extra review.
Defensive priority
High
Recommended defensive actions
- Immediately update Linknat VOS3000 and VOS2009 systems to version 2.1.2.1 or later
- Implement input validation and sanitization for all user-input parameters
- Monitor systems for suspicious activity and implement additional security controls as needed
- Review compensating controls for exposed systems while remediation is scheduled and verified
- Check relevant monitoring, detection, and logs for exposed assets that need extra review
- Track exceptions, retest remediated assets, and close the item only after evidence is documented
- Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up
Evidence notes
The CVE record was published on 2026-07-21T19:17:07.357Z and has not been modified since then. The NVD entry is currently 9.3. The vulnerability is a critical SQL injection issue in Linknat VOS3000 and VOS2009 through version 2.1.2.0. Evidence is based on CVE and NVD details. Defenders should verify system versions and exposure.
Official resources
AI-assisted PatchSiren debrief based on the supplied source corpus. The CVE record was published on 2026-07-21T19:17:07.357Z and has not been modified since then.