CVE-2016-20033

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.

CVSS v4.0

8.5 HIGHCVSS: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

7.8 HIGHCVSS: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)

• https://www.exploit-db.com/exploits/40132

References

• CVE Record
• NVD entry

Related

• CVE-2016-20032
• CVE-2016-20034
• CVE-2016-20031
• CVE-2016-20035
• CVE-2016-20030
• CVE-2016-20036