Wowza Streaming Engine 4.5.0 Engine Service nssm_x64.exe authorization

CVSS Meta Temp Score
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CTI Interest Score
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7.4$0-$5k0.00

Summaryinfo

A vulnerability classified as critical was found in Wowza Streaming Engine 4.5.0. Affected by this issue is some unknown functionality of the file nssm_x64.exe of the component Engine Service. Such manipulation leads to authorization. This vulnerability is documented as CVE-2016-20033. The attack needs to be performed locally. Additionally, an exploit exists.

Detailsinfo

A vulnerability was found in Wowza Streaming Engine 4.5.0 and classified as critical. Affected by this issue is an unknown function of the file nssm_x64.exe of the component Engine Service. The manipulation with an unknown input leads to a authorization vulnerability. Using CWE to declare the problem leads to CWE-639. The system's authorization functionality does not prevent one user from gaining access to another user's data or record by modifying the key value identifying the data. Impacted is confidentiality, integrity, and availability. CVE summarizes:

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.

The weakness was released by Gjoko Krstic as 40132. The advisory is shared for download at exploit-db.com. This vulnerability is handled as CVE-2016-20033 since 03/15/2026. The exploitation is known to be easy. The attack needs to be approached locally. Technical details as well as a public exploit are known.

The exploit is available at exploit-db.com. It is declared as proof-of-concept.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

VulDB is the best source for vulnerability data and more expert information about this specific topic.

Productinfo

Vendor

Name

Version

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CNA CVSS-B Score: 🔒
CNA CVSS-BT Score: 🔒
CNA Vector: 🔒

CVSSv3info

VulDB Meta Base Score: 7.8
VulDB Meta Temp Score: 7.4

VulDB Base Score: 7.8
VulDB Temp Score: 7.1
VulDB Vector: 🔒
VulDB Reliability: 🔍

CNA Base Score: 7.8
CNA Vector (VulnCheck): 🔒

CVSSv2info

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Authorization
CWE: CWE-639 / CWE-285 / CWE-266
CAPEC: 🔒
ATT&CK: 🔒

Physical: Partially
Local: Yes
Remote: No

Availability: 🔒
Access: Public
Status: Proof-of-Concept
Download: 🔒

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

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Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: no mitigation known
Status: 🔍

0-Day Time: 🔒

Timelineinfo

03/15/2026 Advisory disclosed
03/15/2026 +0 days CVE reserved
03/15/2026 +0 days VulDB entry created
03/20/2026 +5 days VulDB entry last update

Sourcesinfo

Advisory: 40132
Researcher: Gjoko Krstic
Status: Not defined

CVE: CVE-2016-20033 (🔒)
GCVE (CVE): GCVE-0-2016-20033
GCVE (VulDB): GCVE-100-351176
scip Labs: https://www.scip.ch/en/?labs.20161013

Entryinfo

Created: 03/15/2026 21:36
Updated: 03/20/2026 21:24
Changes: 03/15/2026 21:36 (79), 03/20/2026 21:24 (1)
Complete: 🔍
Cache ID: 216::103

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