{"id":"CVE-2025-21355","aliases":["EUVD-2025-4643","GHSA-fx4j-9fqf-p9p2"],"status":"published","title":"Microsoft Bing Remote Code Execution Vulnerability","description":"Missing Authentication for Critical Function in Microsoft Bing allows an unauthorized attacker to execute code over a network","severity":{"version":"3.1","score":8.6,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N/E:P/RL:O/RC:C","level":"high","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-11","score":0.01693,"percentile":0.77424,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-306"],"published":"2025-02-19T22:18:21Z","modified":"2026-06-17T08:43:10Z","products":[{"vendor":"microsoft","product":"bing"},{"vendor":"microsoft","product":"microsoft bing"}],"references":[{"url":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-21355","tags":["vendor-advisory","patch","Patch","Vendor Advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2025-21355"},{"url":"https://github.com/advisories/GHSA-fx4j-9fqf-p9p2"}],"sources":{"cve":[{"id":"CVE-2025-21355","title":"Microsoft Bing Remote Code Execution Vulnerability","description":"Missing Authentication for Critical Function in Microsoft Bing allows an unauthorized attacker to execute code over a network","status":"published","published":"2025-02-19T22:18:21.075Z","modified":"2026-02-13T19:44:48.99Z","cvss":[{"version":"3.1","score":8.6,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N/E:P/RL:O/RC:C","level":"high","assessor":"cna"}],"cwes":["CWE-306"],"updated_at":"2026-11-02T14:32:32.702673Z"}],"euvd":[{"id":"EUVD-2025-4643","description":"Missing Authentication for Critical Function in Microsoft Bing allows an unauthorized attacker to execute code over a network","status":"published","published":"2025-02-19T22:18:21Z","modified":"2026-02-13T19:44:48Z","cvss":[{"version":"3.1","score":8.6,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N/E:P/RL:O/RC:C","level":"high"}],"updated_at":"2026-11-02T19:48:38.489604Z"}],"ghsa":[{"id":"GHSA-fx4j-9fqf-p9p2","title":"Missing Authentication for Critical Function in Microsoft Bing allows an unauthorized attacker to...","description":"Missing Authentication for Critical Function in Microsoft Bing allows an unauthorized attacker to execute code over a network","status":"published","published":"2025-02-20T00:32:04Z","modified":"2025-02-20T00:32:11Z","cvss":[{"version":"3.1","score":8.6,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N","level":"high"}],"cwes":["CWE-306"],"updated_at":"2026-11-02T14:59:59.716099Z"}],"nvd":[{"id":"CVE-2025-21355","description":"Missing Authentication for Critical Function in Microsoft Bing allows an unauthorized attacker to execute code over a network","status":"published","published":"2025-02-19T23:15:12.963Z","modified":"2026-06-17T08:43:10.89Z","cvss":[{"version":"3.1","score":8.6,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N","level":"high","assessor":"secondary"},{"version":"3.1","score":9.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"critical","assessor":"primary"}],"cwes":["CWE-306"],"updated_at":"2026-11-02T14:10:51.871789Z"}]}}