CVE-2016-20033
Wowza Streaming Engine 4.5.0 Local Privilege Escalation via nssm_x64.exe
HIGH 8.5EPSS 0.2%
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
- Wowza Media Systems, LLC. · Wowza Streaming Engine
- CVSS v4.0 VULNCHECK
- 8.5 HIGH
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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X - CVSS v3.1 VULNCHECK
- 7.8 HIGH
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H - EPSS
- 0.21% chance of exploitation in the next 30 days, 11th percentile
- Published
- 2026-03-15
- Updated
- 2026-03-16
Proof-of-concept exploits (1)
Security advisories
- http://www.zeroscience.mk/en/vulnerabilities/ZSL-2016-5339.php
- https://www.vulncheck.com/advisories/wowza-streaming-engine-local-privilege-escalation-vi…