{"id":"CVE-2021-25811","aliases":["EUVD-2021-12694","GHSA-575x-p9rr-ph24"],"status":"published","title":"MERCUSYS Mercury X18G 1.0.5 devices allow Denial of service via a crafted value to the POST...","description":"MERCUSYS Mercury X18G 1.0.5 devices allow Denial of service via a crafted value to the POST listen_http_lan parameter. Upon subsequent device restarts after this vulnerability is exploted the device will not be able to access the webserver unless the listen_http_lan parameter to uhttpd.json is manually fixed.","severity":{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high","assessor":"primary","from":"nvd"},"epss":{"day":"2026-11-11","score":0.0163,"percentile":0.76536,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"published":"2021-04-29T15:44:03Z","modified":"2026-06-17T03:42:28Z","products":[{"vendor":"mercusys","product":"mercury_x18g_firmware"}],"references":[{"url":"https://www.mercusys.com/en/","tags":["x_refsource_MISC","x_transferred","Vendor Advisory"]},{"url":"https://www.mercurycom.com.cn/product-521-1.html","tags":["x_refsource_MISC","x_transferred","Product","Vendor Advisory"]},{"url":"https://github.com/pokerfacett/MY_REQUEST/blob/master/Mercury%20Router%20X18g%20v1.0.5%20Denial%20of%20Service.md","tags":["x_refsource_MISC","x_transferred","Broken Link"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2021-25811"},{"url":"https://github.com/advisories/GHSA-575x-p9rr-ph24"}],"sources":{"cve":[{"id":"CVE-2021-25811","description":"MERCUSYS Mercury X18G 1.0.5 devices allow Denial of service via a crafted value to the POST listen_http_lan parameter. Upon subsequent device restarts after this vulnerability is exploted the device will not be able to access the webserver unless the listen_http_lan parameter to uhttpd.json is manually fixed.","status":"published","published":"2021-04-29T15:44:03Z","modified":"2024-08-03T20:11:28.471Z","updated_at":"2026-11-02T14:32:59.802172Z"}],"euvd":[{"id":"EUVD-2021-12694","description":"MERCUSYS Mercury X18G 1.0.5 devices allow Denial of service via a crafted value to the POST listen_http_lan parameter. Upon subsequent device restarts after this vulnerability is exploted the device will not be able to access the webserver unless the listen_http_lan parameter to uhttpd.json is manually fixed.","status":"published","published":"2021-04-29T15:44:03Z","modified":"2024-08-03T20:11:28Z","updated_at":"2026-11-03T03:24:52.420769Z"}],"ghsa":[{"id":"GHSA-575x-p9rr-ph24","title":"MERCUSYS Mercury X18G 1.0.5 devices allow Denial of service via a crafted value to the POST...","description":"MERCUSYS Mercury X18G 1.0.5 devices allow Denial of service via a crafted value to the POST listen_http_lan parameter. Upon subsequent device restarts after this vulnerability is exploted the device will not be able to access the webserver unless the listen_http_lan parameter to uhttpd.json is manually fixed.","status":"published","published":"2022-05-24T17:49:16Z","modified":"2023-01-29T05:07:28Z","updated_at":"2026-11-02T14:46:10.15423Z"}],"nvd":[{"id":"CVE-2021-25811","description":"MERCUSYS Mercury X18G 1.0.5 devices allow Denial of service via a crafted value to the POST listen_http_lan parameter. Upon subsequent device restarts after this vulnerability is exploted the device will not be able to access the webserver unless the listen_http_lan parameter to uhttpd.json is manually fixed.","status":"published","published":"2021-04-29T16:15:09.847Z","modified":"2026-06-17T03:42:28.62Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high","assessor":"primary"},{"version":"2.0","score":7.8,"vector":"AV:N/AC:L/Au:N/C:N/I:N/A:C","level":"high","assessor":"primary"}],"updated_at":"2026-11-02T14:06:52.81233Z"}]}}