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CVE-2016-20033

HIGH CVSS 4.0: 8.5 EPSS 0.02%
Updated Mar 19, 2026
Wowza Streaming
Parameter Value
CVSS 8.5 (HIGH)
Type CWE-639 (Authorization Bypass)
Vendor Wowza Streaming
Public PoC Yes

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.

Attack Parameters

Attack Vector
Local
Requires local access
Attack Complexity
Low
Easy to exploit
Attack Requirements
None
No additional conditions
Privileges Required
Low
Basic privileges needed
User Interaction
None
No user interaction needed

Impact Assessment

Confidentiality
High
Complete data leak
Integrity
High
Complete data modification
Availability
High
Complete denial of service

CVSS Vector v4.0

Weakness Type (CWE)

Vulnerable Products 1

Configuration From (including) Up to (excluding)
Wowza Streaming_Engine
cpe:2.3:a:wowza:streaming_engine:4.5.0:*:*:*:*:*:*:*