{"id":"CVE-2021-33516","url":"https://www.cyber-defence.io/tools/cve/CVE-2021-33516","generatedAt":"2026-10-27T22:32:22.512Z","title":"It allows DNS rebinding.","description":"An issue was discovered in GUPnP before 1.0.7 and 1.1.x and 1.2.x before 1.2.5. It allows DNS rebinding. A remote web server can exploit this vulnerability to trick a victim's browser into triggering actions against local UPnP services implemented using this library. Depending on the affected service, this could be used for data exfiltration, data tempering, etc.","published":"2021-05-24T15:15:07.000Z","lastModified":"2026-06-17T03:54:43.000Z","status":"Modified","sourceIdentifier":"cve@mitre.org","cvss":{"version":"3.1","score":8.1,"severity":"HIGH","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N"},"cwe":[],"affected":["gnome/gupnp"],"epss":{"score":0.01084,"percentile":0.64998,"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 (1.08%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit."},"changes":[],"references":[{"url":"https://discourse.gnome.org/t/security-relevant-releases-for-gupnp-issue-cve-2021-33516/6536","tags":["Patch","Vendor Advisory"],"source":"cve@mitre.org"},{"url":"https://gitlab.gnome.org/GNOME/gupnp/-/issues/24","tags":["Issue Tracking","Vendor Advisory"],"source":"cve@mitre.org"},{"url":"https://discourse.gnome.org/t/security-relevant-releases-for-gupnp-issue-cve-2021-33516/6536","tags":["Patch","Vendor Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://gitlab.gnome.org/GNOME/gupnp/-/issues/24","tags":["Issue Tracking","Vendor Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2021-33516","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."}