CVE-2016-20034

Name: CVE-2016-20034
Creator: NVD / NIST
Published: 2026-03-16T14:17:50.507+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 8.7/10EPSS 0.21%

Last modified Jun 17, 2026

CVE-2016-20034 is a high-severity vulnerability rated 8.7/10 on the CVSS scale. Wowza Streaming Engine 4.5.0 contains a privilege escalation vulnerability that allows authenticated read-only users to elevate privileges to administrator by manipulating POST parameters. Attackers can send POST requests to the user edit endpoint with accessLevel set to 'admin' and advUser parameters set to 'true' and 'on' to gain administrative access.. EPSS estimates a 0.21% chance of exploitation in the next 30 days.

Description

Wowza Streaming Engine 4.5.0 contains a privilege escalation vulnerability that allows authenticated read-only users to elevate privileges to administrator by manipulating POST parameters. Attackers can send POST requests to the user edit endpoint with accessLevel set to 'admin' and advUser parameters set to 'true' and 'on' to gain administrative access.

Metrics

CVSS 3.1

8/10

CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H

CVSS 4.0

8.7/10

CVSS:4.0/AV:N/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

EPSS Probability

0.21%

11.1th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-352

Affected Software

Vendor	Product	Versions
Wowza	Streaming Engine	4.5.0

References

http://www.zeroscience.mk/en/vulnerabilities/ZSL-2016-5340.phpExploit, Third Party Advisory
https://www.exploit-db.com/exploits/40133Exploit, Third Party Advisory, VDB Entry
https://www.vulncheck.com/advisories/wowza-streaming-engine-privilege-escalation-via-user-editThird Party Advisory

Timeline

Published: Mar 16, 2026
Last Modified: Jun 17, 2026
Status: Analyzed

Frequently Asked Questions

What is CVE-2016-20034?

How severe is CVE-2016-20034?

CVE-2016-20034 has a CVSS score of 8.7/10 (HIGH severity). The EPSS model estimates a 0.21% probability of exploitation in the next 30 days.

How do I fix CVE-2016-20034?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2016-20034?

Run a free Strix scan to check your systems for this vulnerability.

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Source: NVD / NIST