{"id":"CVE-2021-45756","title":"Asus RT-AC68U <3.0.0.4.385.20633 and RT-AC5300 <3.0.0.4.384.82072 are affected by a buffer overflow in blocking_request.cgi.","summary":"Asus RT-AC68U <3.0.0.4.385.20633 and RT-AC5300 <3.0.0.4.384.82072 are affected by a buffer overflow in blocking_request.cgi.","severity":"critical","cvss":9.8,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","cwe":["CWE-120"],"vendor":"asus","product":"rt-ac68u_firmware","affected":["rt-ac68u_firmware < 3.0.0.4.385.20633","rt-ac5300_firmware < 3.0.0.4.384.82072"],"patched":["rt-ac68u_firmware 3.0.0.4.385.20633","rt-ac5300_firmware 3.0.0.4.384.82072"],"published":"2022-03-23","updated":"2026-07-05","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2021-45756","references":[{"url":"https://github.com/IBUILI/Asus","label":"cve@mitre.org"},{"url":"http://asus.com","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"http://rt-ac68u.com","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://github.com/IBUILI/Asus","label":"af854a3a-2127-422b-91ae-364da2661108"}],"tags":["nvd"],"epss":0.01243,"epssPercentile":0.67905,"ingestedAt":"2026-07-06T02:09:23.440Z","slug":"CVE-2021-45756","body":"## Overview\n\nAsus RT-AC68U <3.0.0.4.385.20633 and RT-AC5300 <3.0.0.4.384.82072 are affected by a buffer overflow in blocking_request.cgi.\n\n## Affected\n\n- `rt-ac68u_firmware < 3.0.0.4.385.20633`\n- `rt-ac5300_firmware < 3.0.0.4.384.82072`\n\n## Remediation\n\nUpgrade past the affected range:\n\n- `rt-ac68u_firmware 3.0.0.4.385.20633`\n- `rt-ac5300_firmware 3.0.0.4.384.82072`","depth":"midnight","depthScore":54,"depthScoreParts":{"impact":53.9,"likelihood":0.2,"exploitation":0,"ransomware":0},"changes":[]}