{"id":"CVE-2021-35030","aliases":["EUVD-2021-21677","GHSA-g78g-pgq7-f6cr"],"status":"published","title":"A vulnerability was found in the CGI program in Zyxel GS1900-8 firmware version V2.60, that did...","description":"A vulnerability was found in the CGI program in Zyxel GS1900-8 firmware version V2.60, that did not properly sterilize packet contents and could allow an authenticated, local user to perform a cross-site scripting (XSS) attack via a crafted LLDP packet.","severity":{"version":"3.1","score":3.5,"vector":"CVSS:3.1/AV:A/AC:L/PR:H/UI:N/S:U/C:N/I:L/A:L","level":"low","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-10","score":0.00268,"percentile":0.19084,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-79"],"published":"2021-07-26T11:20:40Z","modified":"2026-06-17T03:56:58Z","products":[{"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":"gs1900-8_firmware"},{"vendor":"zyxel","product":"gs1900-8hp_firmware"}],"references":[{"url":"https://www.zyxel.com/support/Zyxel_security_advisory_for_XSS_vulnerability_of_GS1900_series_switches.shtml","tags":["x_refsource_MISC","x_transferred","Patch","Vendor Advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2021-35030"},{"url":"https://github.com/advisories/GHSA-g78g-pgq7-f6cr"}],"sources":{"cve":[{"id":"CVE-2021-35030","description":"A vulnerability was found in the CGI program in Zyxel GS1900-8 firmware version V2.60, that did not properly sterilize packet contents and could allow an authenticated, local user to perform a cross-site scripting (XSS) attack via a crafted LLDP packet.","status":"published","published":"2021-07-26T11:20:40.191Z","modified":"2024-09-17T01:46:12.877Z","cvss":[{"version":"3.1","score":3.5,"vector":"CVSS:3.1/AV:A/AC:L/PR:H/UI:N/S:U/C:N/I:L/A:L","level":"low","assessor":"cna"}],"cwes":["CWE-79"],"updated_at":"2026-11-02T14:33:09.864034Z"}],"euvd":[{"id":"EUVD-2021-21677","description":"A vulnerability was found in the CGI program in Zyxel GS1900-8 firmware version V2.60, that did not properly sterilize packet contents and could allow an authenticated, local user to perform a cross-site scripting (XSS) attack via a crafted LLDP packet.","status":"published","published":"2021-07-26T11:20:40Z","modified":"2024-09-17T01:46:12Z","cvss":[{"version":"3.1","score":3.5,"vector":"CVSS:3.1/AV:A/AC:L/PR:H/UI:N/S:U/C:N/I:L/A:L","level":"low"}],"updated_at":"2026-11-03T00:28:46.561775Z"}],"ghsa":[{"id":"GHSA-g78g-pgq7-f6cr","title":"A vulnerability was found in the CGI program in Zyxel GS1900-8 firmware version V2.60, that did...","description":"A vulnerability was found in the CGI program in Zyxel GS1900-8 firmware version V2.60, that did not properly sterilize packet contents and could allow an authenticated, local user to perform a cross-site scripting (XSS) attack via a crafted LLDP packet.","status":"published","published":"2022-05-24T19:09:13Z","modified":"2023-01-30T05:01:09Z","cwes":["CWE-79"],"updated_at":"2026-11-02T14:46:21.093669Z"}],"nvd":[{"id":"CVE-2021-35030","description":"A vulnerability was found in the CGI program in Zyxel GS1900-8 firmware version V2.60, that did not properly sterilize packet contents and could allow an authenticated, local user to perform a cross-site scripting (XSS) attack via a crafted LLDP packet.","status":"published","published":"2021-07-26T12:15:08.817Z","modified":"2026-06-17T03:56:58.623Z","cvss":[{"version":"3.1","score":3.5,"vector":"CVSS:3.1/AV:A/AC:L/PR:H/UI:N/S:U/C:N/I:L/A:L","level":"low","assessor":"secondary"},{"version":"3.1","score":4.3,"vector":"CVSS:3.1/AV:A/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N","level":"medium","assessor":"primary"},{"version":"2.0","score":2.3,"vector":"AV:A/AC:M/Au:S/C:N/I:P/A:N","level":"low","assessor":"primary"}],"cwes":["CWE-79"],"updated_at":"2026-11-02T14:06:56.185362Z"}]}}