{"cve":"CVE-2021-33516","nvd":{"published":"2021-05-24T15:15:07.400","modified":"2026-06-17T03:54:42.873","status":"Modified","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.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N","score":8.1},"cwes":[],"references":["https://discourse.gnome.org/t/security-relevant-releases-for-gupnp-issue-cve-2021-33516/6536","https://gitlab.gnome.org/GNOME/gupnp/-/issues/24","https://discourse.gnome.org/t/security-relevant-releases-for-gupnp-issue-cve-2021-33516/6536","https://gitlab.gnome.org/GNOME/gupnp/-/issues/24"],"products":["gnome:gupnp"],"source":"nvd","synced_at":"2026-10-19T21:18:09.669877188+00:00"},"epss":{"cve":"CVE-2021-33516","score":0.01084,"percentile":0.65237,"date":"2026-10-31"},"kev":null,"osv":[],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}