{"id":"CVE-2021-34201","title":"D-Link DIR-2640-US 1.01B04 is vulnerable to Buffer Overflow","summary":"D-Link DIR-2640-US 1.01B04 is vulnerable to Buffer Overflow. There are multiple out-of-bounds vulnerabilities in some processes of D-Link AC2600(DIR-2640). Local ordinary users can overwrite the global variables in the .bss section, caus…","severity":"high","cvss":7.1,"cvssVector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H","cwe":["CWE-787"],"vendor":"dlink","product":"dir-2640-us_firmware","affected":["dir-2640-us_firmware = 1.01b04"],"published":"2021-06-16","updated":"2026-07-05","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2021-34201","references":[{"url":"https://github.com/liyansong2018/CVE/tree/main/2021/CVE-2021-34201","label":"cve@mitre.org"},{"url":"https://www.dlink.com/en/security-bulletin/","label":"cve@mitre.org"},{"url":"http://d-link.com","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"http://dir-2640-us.com","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://github.com/liyansong2018/CVE/tree/main/2021/CVE-2021-34201","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://www.dlink.com/en/security-bulletin/","label":"af854a3a-2127-422b-91ae-364da2661108"}],"tags":["nvd"],"epss":0.0054,"epssPercentile":0.44119,"ingestedAt":"2026-07-06T01:08:16.757Z","slug":"CVE-2021-34201","body":"## Overview\n\nD-Link DIR-2640-US 1.01B04 is vulnerable to Buffer Overflow. There are multiple out-of-bounds vulnerabilities in some processes of D-Link AC2600(DIR-2640). Local ordinary users can overwrite the global variables in the .bss section, causing the process crashes or changes.\n\n## Affected\n\n- `dir-2640-us_firmware = 1.01b04`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"twilight","depthScore":39,"depthScoreParts":{"impact":39.1,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}