{"id":"CVE-2021-34201","aliases":["EUVD-2021-20863","GHSA-rrqf-rmhw-fr5m"],"status":"published","title":"D-Link DIR-2640-US 1.01B04 is vulnerable to Buffer Overflow. There are multiple out-of-bounds...","description":"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, causing the process crashes or changes.","severity":{"version":"3.1","score":7.1,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H","level":"high","assessor":"primary","from":"nvd"},"epss":{"day":"2026-11-10","score":0.0054,"percentile":0.45747,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-787"],"published":"2021-06-16T19:50:16Z","modified":"2026-07-09T01:16:55Z","products":[{"vendor":"dlink","product":"dir-2640-us_firmware"}],"references":[{"url":"https://www.dlink.com/en/security-bulletin/","tags":["x_refsource_MISC","x_transferred","Vendor Advisory"]},{"url":"https://github.com/liyansong2018/CVE/tree/main/2021/CVE-2021-34201","tags":["x_refsource_MISC","x_transferred","Exploit","Third Party Advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2021-34201"},{"url":"http://d-link.com"},{"url":"http://dir-2640-us.com"},{"url":"https://www.dlink.com/en/security-bulletin"},{"url":"https://github.com/advisories/GHSA-rrqf-rmhw-fr5m"}],"sources":{"cve":[{"id":"CVE-2021-34201","description":"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, causing the process crashes or changes.","status":"published","published":"2021-06-16T19:50:16Z","modified":"2026-07-09T00:13:53.669Z","updated_at":"2026-11-02T14:33:11.244759Z"}],"euvd":[{"id":"EUVD-2021-20863","description":"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, causing the process crashes or changes.","status":"published","published":"2021-06-16T19:50:16Z","modified":"2026-07-09T00:13:53Z","updated_at":"2026-11-02T18:20:09.112703Z"}],"ghsa":[{"id":"GHSA-rrqf-rmhw-fr5m","title":"D-Link DIR-2640-US 1.01B04 is vulnerable to Buffer Overflow. There are multiple out-of-bounds...","description":"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, causing the process crashes or changes.","status":"published","published":"2022-05-24T19:05:25Z","modified":"2026-07-05T00:32:23Z","cvss":[{"version":"3.1","score":7.1,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H","level":"high"}],"cwes":["CWE-787"],"updated_at":"2026-11-02T15:09:14.897479Z"}],"nvd":[{"id":"CVE-2021-34201","description":"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, causing the process crashes or changes.","status":"published","published":"2021-06-16T20:15:07.573Z","modified":"2026-07-09T01:16:55.317Z","cvss":[{"version":"3.1","score":7.1,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H","level":"high","assessor":"primary"},{"version":"2.0","score":3.6,"vector":"AV:L/AC:L/Au:N/C:N/I:P/A:P","level":"low","assessor":"primary"}],"cwes":["CWE-787"],"updated_at":"2026-11-02T14:06:54.892562Z"}]}}