{"cve":"CVE-2021-35031","nvd":{"published":"2021-12-28T11:15:07.463","modified":"2026-06-17T03:56:58.753","status":"Modified","description":"A vulnerability in the TFTP client of Zyxel GS1900 series firmware, XGS1210 series firmware, and XGS1250 series firmware, which could allow an authenticated LAN user to execute arbitrary OS commands via the GUI of the vulnerable device.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","score":8.0},"cwes":["CWE-78"],"references":["https://www.zyxel.com/support/Zyxel_security_advisory_for_OS_command_injection_vulnerabilities_of_switches.shtml","https://www.zyxel.com/support/Zyxel_security_advisory_for_OS_command_injection_vulnerabilities_of_switches.shtml"],"products":["zyxel:gs1900-10hp_firmware","zyxel:gs1900-16_firmware","zyxel:gs1900-24_firmware","zyxel:gs1900-24e_firmware","zyxel:gs1900-24ep_firmware","zyxel:gs1900-24hp_firmware","zyxel:gs1900-24hpv2_firmware","zyxel:gs1900-48_firmware","zyxel:gs1900-48hp_firmware","zyxel:gs1900-48hpv2_firmware","zyxel:gs1900-8_firmware","zyxel:gs1900-8hp_firmware","zyxel:xgs1210-12_firmware","zyxel:xgs1250-12_firmware"],"source":"nvd","synced_at":"2026-10-19T21:26:33.761856376+00:00"},"epss":{"cve":"CVE-2021-35031","score":0.00478,"percentile":0.41317,"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."]}