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Vulnerability record · CVE-2016-20033 · published 16 March 2026

CVE-2016-20033: Wowza streaming engine insecure direct object reference vulnerability

Wowza · Streaming Engine

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.

8.5 CVSS 4.0 High EPSS 0.21% · top 90.2% CWE-639 · Insecure direct object reference
8.5CVSS 4.0 base score
0.21%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
3References, 2 tagged exploit
17 Jun 2026Last modified by NVD

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: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:

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

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

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

9.8CVE-2018-7047Wowza streaming engine hard-coded credentials vulnerabilityAn issue was discovered in the MBeans Server in Wowza Streaming Engine before 4.7.1. The file system may be read and written to via JMX using the def…EPSS 2.3%9.4CVE-2024-52052Wowza streaming engine vulnerabilityWowza Streaming Engine below 4.9.1 permits an authenticated Streaming Engine Manager administrator to define a custom application property and poison…EPSS 0.50%9.1CVE-2018-19365Wowza streaming engine path traversal vulnerabilityThe REST API in Wowza Streaming Engine 4.7.4.01 allows traversal of the directory structure and retrieval of a file via a remote, specifically crafte…EPSS 22%8.8CVE-2020-9004Wowza streaming engine missing authentication for critical function vulnerabilityA remote authenticated authorization-bypass vulnerability in Wowza Streaming Engine 4.8.0 and earlier allows any read-only user to issue requests to …EPSS 3.5%8.7CVE-2016-20034Wowza streaming engine cross-site request forgery vulnerabilityWowza Streaming Engine 4.5.0 contains a privilege escalation vulnerability that allows authenticated read-only users to elevate privileges to adminis…EPSS 0.21%8.7CVE-2024-52053Wowza streaming engine cross-site scripting vulnerabilityStored Cross-Site Scripting in the Manager component of Wowza Streaming Engine below 4.9.1 allows an unauthenticated attacker to inject client-side J…EPSS 0.66%8.2CVE-2024-52055Wowza streaming engine path traversal vulnerabilityPath Traversal in the Manager component of Wowza Streaming Engine below 4.9.1 allows an administrator user to read any file on the file system if the…EPSS 1.00%8.1CVE-2021-35491Wowza streaming engine cross-site request forgery vulnerabilityA Cross-Site Request Forgery (CSRF) vulnerability in Wowza Streaming Engine through 4.8.11+5 allows a remote attacker to delete a user account via th…EPSS 0.88%

Source: NIST National Vulnerability Database (record CVE-2016-20033), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.