What’s Vulnerable › Vulnerabilities

CVE-2016-20033: Wowza Streaming Engine 4.5.0 Local Privilege Escalation via nssm_x64.exe

• Severity: high (CVSS 7.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2026-03-16 · updated 2026-06-17
• Weakness: CWE-639

Description

Wowza Streaming Engine 4.5.0 contains a local privilege escalation vulnerability that allows authenticated users to escalate privileges by replacing executable files due to improper file permissions granting full access to the Everyone group. Attackers can replace the nssm_x64.exe binary in the manager and engine service directories with malicious executables to execute code with LocalSystem privileges when services restart.

Affected products

• Wowza Streaming Engine: 4.5.0

References

• http://www.zeroscience.mk/en/vulnerabilities/ZSL-2016-5339.php
• https://www.exploit-db.com/exploits/40132
• https://www.vulncheck.com/advisories/wowza-streaming-engine-local-privilege-escalation-via-nssm-x64-exe

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