CVE-2021-31540

Name: CVE-2021-31540
Creator: NVD / NIST
Published: 2021-04-23T17:15:08.363+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.1/10EPSS 0.39%

Last modified Jun 17, 2026

CVE-2021-31540 is a high-severity vulnerability rated 7.1/10 on the CVSS scale. Wowza Streaming Engine through 4.8.5 (in a default installation) has incorrect file permissions of configuration files in the conf/ directory. A regular local user is able to read and write to all the configuration files, e.g., modify the application server configuration.. EPSS estimates a 0.39% chance of exploitation in the next 30 days.

Description

Wowza Streaming Engine through 4.8.5 (in a default installation) has incorrect file permissions of configuration files in the conf/ directory. A regular local user is able to read and write to all the configuration files, e.g., modify the application server configuration.

Metrics

CVSS 3.1

7.1/10

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

EPSS Probability

0.39%

30.7th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-732

Affected Software

Vendor	Product	Versions
Wowza	Streaming Engine	<= 4.8.5

References

https://www.gruppotim.it/redteamExploit, Third Party Advisory
https://www.wowza.com/docs/wowza-streaming-engine-4-8-12-release-notesRelease Notes, Vendor Advisory
https://www.wowza.com/products/streaming-engineVendor Advisory
https://www.gruppotim.it/redteamExploit, Third Party Advisory
https://www.wowza.com/docs/wowza-streaming-engine-4-8-12-release-notesRelease Notes, Vendor Advisory
https://www.wowza.com/products/streaming-engineVendor Advisory

Timeline

Published: Apr 23, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-31540?

How severe is CVE-2021-31540?

CVE-2021-31540 has a CVSS score of 7.1/10 (HIGH severity). The EPSS model estimates a 0.39% probability of exploitation in the next 30 days.

How do I fix CVE-2021-31540?

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-2021-31540?

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

Scan your code now

Source: NVD / NIST