{"cve":"CVE-2021-42757","nvd":{"published":"2021-12-08T11:15:11.840","modified":"2026-06-17T04:10:05.000","status":"Modified","description":"A buffer overflow [CWE-121] in the TFTP client library of FortiOS before 6.4.7 and FortiOS 7.0.0 through 7.0.2, may allow an authenticated local attacker to achieve arbitrary code execution via specially crafted command line arguments.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H","score":6.7},"cwes":["CWE-120","CWE-787"],"references":["https://fortiguard.com/advisory/FG-IR-21-173","https://fortiguard.com/advisory/FG-IR-21-173"],"products":["fortinet:fortiadc","fortinet:fortianalyzer","fortinet:fortimail","fortinet:fortimanager","fortinet:fortindr","fortinet:fortios","fortinet:fortios-6k7k","fortinet:fortiportal","fortinet:fortiproxy","fortinet:fortirecorder_firmware","fortinet:fortiswitch","fortinet:fortivoice","fortinet:fortiweb"],"source":"nvd","synced_at":"2026-10-19T21:25:41.256909649+00:00"},"epss":{"cve":"CVE-2021-42757","score":0.00516,"percentile":0.43938,"date":"2026-10-31"},"kev":null,"osv":[],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}