{"id":"CVE-2021-31540","url":"https://www.cyber-defence.io/tools/cve/CVE-2021-31540","generatedAt":"2026-10-27T23:43:24.120Z","title":"Wowza Streaming Engine through 4.8.5 (in a default installation) has incorrect file permissions of configuration files in the conf/ directory.","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.","published":"2021-04-23T17:15:08.000Z","lastModified":"2026-06-17T03:51:59.000Z","status":"Modified","sourceIdentifier":"cve@mitre.org","cvss":{"version":"3.1","score":7.1,"severity":"HIGH","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N"},"cwe":["CWE-732"],"affected":["wowza/streaming engine"],"epss":{"score":0.00389,"percentile":0.32754,"date":"2026-10-26","history":[]},"kev":{"listed":false},"exploits":{"count":0,"verified":false,"firstPublished":null,"source":"Exploit-DB (https://gitlab.com/exploit-database/exploitdb)","entries":[]},"verdict":{"level":"high","text":"High impact if exploited, but EPSS currently rates exploitation as unlikely (0.39%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit."},"changes":[],"references":[{"url":"https://www.gruppotim.it/redteam","tags":["Exploit","Third Party Advisory"],"source":"cve@mitre.org"},{"url":"https://www.wowza.com/docs/wowza-streaming-engine-4-8-12-release-notes","tags":["Release Notes","Vendor Advisory"],"source":"cve@mitre.org"},{"url":"https://www.wowza.com/products/streaming-engine","tags":["Vendor Advisory"],"source":"cve@mitre.org"},{"url":"https://www.gruppotim.it/redteam","tags":["Exploit","Third Party Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://www.wowza.com/docs/wowza-streaming-engine-4-8-12-release-notes","tags":["Release Notes","Vendor Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://www.wowza.com/products/streaming-engine","tags":["Vendor Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2021-31540","epss":"https://www.first.org/epss/","kev":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog","exploitdb":"https://www.exploit-db.com/"},"licence":"CC BY 4.0 — link back to the CVE Explorer if you publish the results; upstream data remains subject to its own terms."}