CVE-2019-7656

Name: CVE-2019-7656
Creator: NVD / NIST
Published: 2020-01-29T16:15:11.99+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.8/10EPSS 0.45%

Last modified Jun 17, 2026

CVE-2019-7656 is a high-severity vulnerability rated 7.8/10 on the CVSS scale. A privilege escalation vulnerability in Wowza Streaming Engine 4.8.0 and earlier allows any unprivileged Linux user to escalate privileges to root. The installer sets too relaxed permissions on /usr/local/WowzaStreamingEngine/bin/* core program files. EPSS estimates a 0.45% chance of exploitation in the next 30 days.

Description

A privilege escalation vulnerability in Wowza Streaming Engine 4.8.0 and earlier allows any unprivileged Linux user to escalate privileges to root. The installer sets too relaxed permissions on /usr/local/WowzaStreamingEngine/bin/* core program files. By injecting a payload into one of those files, it will run with the same privileges as the Wowza server, root. For example, /usr/local/WowzaStreamingEngine/bin/tune.sh could be replaced with a Trojan horse. This issue was resolved in Wowza Streaming Engine 4.8.5.

Metrics

CVSS 3.1

7.8/10

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

EPSS Probability

0.45%

35.9th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-732

Affected Software

Vendor	Product	Versions
Wowza	Streaming Engine	<= 4.8.0

References

https://github.com/DrunkenShells/Disclosures/tree/master/CVE-2019-7656-PrivEscal-WowzaExploit, Third Party Advisory
https://raw.githubusercontent.com/WowzaMediaSystems/public_cve/main/wowza-streaming-engine/CVE-2019-7656.txtThird Party Advisory
https://www.wowza.com/docs/wowza-streaming-engine-4-8-5-release-notesRelease Notes, Vendor Advisory
https://www.wowza.com/pricing/installerVendor Advisory
https://github.com/DrunkenShells/Disclosures/tree/master/CVE-2019-7656-PrivEscal-WowzaExploit, Third Party Advisory
https://raw.githubusercontent.com/WowzaMediaSystems/public_cve/main/wowza-streaming-engine/CVE-2019-7656.txtThird Party Advisory
https://www.wowza.com/docs/wowza-streaming-engine-4-8-5-release-notesRelease Notes, Vendor Advisory
https://www.wowza.com/pricing/installerVendor Advisory

Timeline

Published: Jan 29, 2020
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2019-7656?

How severe is CVE-2019-7656?

CVE-2019-7656 has a CVSS score of 7.8/10 (HIGH severity). The EPSS model estimates a 0.45% probability of exploitation in the next 30 days.

How do I fix CVE-2019-7656?

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-2019-7656?

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

Scan your code now

Source: NVD / NIST