{"id":"CVE-2021-35031","aliases":["EUVD-2021-21678","GHSA-xghr-m3mr-m6m9"],"status":"published","title":"A vulnerability in the TFTP client of Zyxel GS1900 series firmware, XGS1210 series firmware, and...","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.","severity":{"version":"3.1","score":6.8,"vector":"CVSS:3.1/AV:A/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H","level":"medium","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-12","score":0.00478,"percentile":0.4181,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-78"],"published":"2021-12-28T10:36:23Z","modified":"2026-06-17T03:56:58Z","products":[{"vendor":"zyxel","product":"gs1900 series firmware"},{"vendor":"zyxel","product":"gs1900-10hp_firmware"},{"vendor":"zyxel","product":"gs1900-16_firmware"},{"vendor":"zyxel","product":"gs1900-24_firmware"},{"vendor":"zyxel","product":"gs1900-24e_firmware"},{"vendor":"zyxel","product":"gs1900-24ep_firmware"},{"vendor":"zyxel","product":"gs1900-24hp_firmware"},{"vendor":"zyxel","product":"gs1900-24hpv2_firmware"},{"vendor":"zyxel","product":"gs1900-48_firmware"},{"vendor":"zyxel","product":"gs1900-48hp_firmware"},{"vendor":"zyxel","product":"gs1900-48hpv2_firmware"},{"vendor":"zyxel","product":"gs1900-8_firmware"},{"vendor":"zyxel","product":"gs1900-8hp_firmware"},{"vendor":"zyxel","product":"xgs1210 series firmware"},{"vendor":"zyxel","product":"xgs1210-12_firmware"},{"vendor":"zyxel","product":"xgs1250 series firmware"},{"vendor":"zyxel","product":"xgs1250-12_firmware"}],"references":[{"url":"https://www.zyxel.com/support/Zyxel_security_advisory_for_OS_command_injection_vulnerabilities_of_switches.shtml","tags":["x_refsource_CONFIRM","x_transferred","Patch","Vendor Advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2021-35031"},{"url":"https://github.com/advisories/GHSA-xghr-m3mr-m6m9"}],"sources":{"cve":[{"id":"CVE-2021-35031","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.","status":"published","published":"2021-12-28T10:36:23Z","modified":"2024-08-04T00:33:49.873Z","cvss":[{"version":"3.1","score":6.8,"vector":"CVSS:3.1/AV:A/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H","level":"medium","assessor":"cna"}],"cwes":["CWE-78"],"updated_at":"2026-11-02T14:33:09.864034Z"}],"euvd":[{"id":"EUVD-2021-21678","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.","status":"published","published":"2021-12-28T10:36:23Z","modified":"2024-08-04T00:33:49Z","cvss":[{"version":"3.1","score":6.8,"vector":"CVSS:3.1/AV:A/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H","level":"medium"}],"updated_at":"2026-11-03T03:24:31.533826Z"}],"ghsa":[{"id":"GHSA-xghr-m3mr-m6m9","title":"A vulnerability in the TFTP client of Zyxel GS1900 series firmware, XGS1210 series firmware, and...","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.","status":"published","published":"2021-12-29T00:00:45Z","modified":"2023-02-03T05:03:53Z","cwes":["CWE-78"],"updated_at":"2026-11-02T14:53:26.852274Z"}],"nvd":[{"id":"CVE-2021-35031","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.","status":"published","published":"2021-12-28T11:15:07.463Z","modified":"2026-06-17T03:56:58.753Z","cvss":[{"version":"3.1","score":6.8,"vector":"CVSS:3.1/AV:A/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H","level":"medium","assessor":"secondary"},{"version":"3.1","score":8,"vector":"CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","level":"high","assessor":"primary"},{"version":"2.0","score":7.7,"vector":"AV:A/AC:L/Au:S/C:C/I:C/A:C","level":"high","assessor":"primary"}],"cwes":["CWE-78"],"updated_at":"2026-11-02T14:07:02.977492Z"}]}}