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CVE-2016-20033

Wowza Streaming Engine 4.5.0 Local Privilege Escalation via nssm_x64.exe

Published: Mar 15, 2026Updated: Mar 19, 2026 Sources: CVE List NVDCWE-639
NVD MITRE
7.8CVSSHIGH
EPSS Score
0.2%
Top 89.2%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
No Fix Available

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.

CVSS Vector Breakdown

AV:LAC:LPR:LUI:NS:UC:HI:HA:H
Exploitability
AV:LAttack Vector
Local
AC:LAttack Complexity
Low
PR:LPrivileges Required
Low
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:HConfidentiality
High
I:HIntegrity
High
A:HAvailability
High
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Weaknesses

CWE-639

Affected Products

streaming enginewowza
On-prem
Communications / video-conferencing
Wowza Streaming EngineWowza Media Systems, LLC.
On-prem
Communications / video-conferencing
wowzacommercialCommunicationsaka wowza streaming engine
wowza media systems, llc.commercialCommunicationsaka wowza streaming engine

Attack Graph

Products CVE Techniques Tactics

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Exploitability

No known exploits, KEV entries, or remediation guidance available for this vulnerability yet.

MITRE ATT&CK

1 technique
Initial Access
View detailed technique mapping

References

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

Timeline

Published
Mar 15, 2026
Last Updated
Mar 19, 2026

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