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TI-2016-09209 Aliases CVE-2016-20033GHSA-fmp5-4w5p-wx24

Wowza Streaming Engine 4.5.0 Local Privilege Escalation via nssm_x64.exe

Priority HIGH 72CWE-639Published · Updated

Key facts

Attack vector
Local
Privileges required
Low
User interaction
None
Attack complexity
Low
Attack requirements
None
Impact type
Security bypass
Confidentiality · integrity · availability
High · High · High
Fix status
No fix listed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-639.

Summary

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.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00217 12th percentileScored 2026-11-07
Public exploit Yes 2 exploit referencesTagged by the CNA and NVD
Fix No fix listed No fixed version in the sources yet

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
Poc
Automatable
No
Technical impact
Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
WowzaWowza Streaming Engine4.5.0—No fix listedCNA
  • Wowza Streaming Engine VendorWowza Affected 4.5.0 Fixed in — No fix listed CNA

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:wowza:streaming_engine:4.5.0:*:*:*:*:*:*:*4.5.0VulnerableWowza
  • cpe:2.3:a:wowza:streaming_engine:4.5.0:*:*:*:*:*:*:* Versions 4.5.0 Vulnerable ·Wowza

Remediation

No fixed version listed by the sources yet.

Timeline

  1. 2026-10-02 Threatist record created from CVE-2016-20033
  2. 2026-10-03 Alias added: GHSA-fmp5-4w5p-wx24

References

Exploit 2

  • TI-2016-09210 Wowza Streaming Engine 4.5.0 Privilege Escalation via user edit CVSS 4.0HIGH 8.7
  • TI-2016-09211 Wowza Streaming Engine 4.5.0 CSRF via user edit endpoint CVSS 4.0MEDIUM 6.9
  • TI-2018-13723 The REST API in Wowza Streaming Engine 4.7.4.01 allows traversal of the directory… CVSS 3.1CRITICAL 9.1
  • TI-2016-09212 Wowza Streaming Engine 4.5.0 Multiple Cross-Site Scripting Vulnerabilities CVSS 4.0MEDIUM 5.1
  • TI-2018-05112 An issue was discovered in the MBeans Server in Wowza Streaming Engine before 4.7.1. CVSS 3.0CRITICAL 9.8
  • TI-2020-07224 A remote authenticated authorization-bypass vulnerability in Wowza Streaming Engine 4.8.0… CVSS 3.1HIGH 8.8
See all 25 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences