CVE-2016-20033 HIGH

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

Vendor Wowza Media Systems, Llc.
Product Wowza Streaming Engine
Weakness CWE-639 · IDOR
Published March 15, 2026
Last update March 16, 2026

CVSS base score

8.5/10
Attack vector Local
Attack complexity Low
Privileges required Low
User interaction None
Confidentiality
Integrity

CVSS vector

CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

What the vulnerability does

01Description

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.

Key dates

02Disclosure timeline

March 15, 2026 CVE published
March 16, 2026 Record updated