{"id":"CVE-2020-27861","aliases":["EUVD-2020-20354","GHSA-jwqc-9f7p-v456"],"status":"published","title":"This vulnerability allows network-adjacent attackers to execute arbitrary code on affected...","description":"This vulnerability allows network-adjacent attackers to execute arbitrary code on affected installations of NETGEAR Orbi 2.5.1.16 routers. Authentication is not required to exploit this vulnerability. The specific flaw exists within the UA_Parser utility. A crafted Host Name option in a DHCP request can trigger execution of a system call composed from a user-supplied string. An attacker can leverage this vulnerability to execute code in the context of root. Was ZDI-CAN-11076.","severity":{"version":"3.0","score":8.8,"vector":"CVSS:3.0/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"high","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-12","score":0.02122,"percentile":0.82149,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-78"],"published":"2021-02-11T23:35:36Z","modified":"2026-06-17T03:09:45Z","products":[{"vendor":"netgear","product":"cbk40_firmware"},{"vendor":"netgear","product":"cbk43_firmware"},{"vendor":"netgear","product":"cbr40_firmware"},{"vendor":"netgear","product":"ex6200_firmware"},{"vendor":"netgear","product":"ex7700_firmware"},{"vendor":"netgear","product":"ex8000_firmware"},{"vendor":"netgear","product":"orbi"},{"vendor":"netgear","product":"rbk12_firmware"},{"vendor":"netgear","product":"rbk13_firmware"},{"vendor":"netgear","product":"rbk14_firmware"},{"vendor":"netgear","product":"rbk15_firmware"},{"vendor":"netgear","product":"rbk20_router_firmware"},{"vendor":"netgear","product":"rbk20_satellite_firmware"},{"vendor":"netgear","product":"rbk20w_firmware"},{"vendor":"netgear","product":"rbk22_router_firmware"},{"vendor":"netgear","product":"rbk22_satellite_firmware"},{"vendor":"netgear","product":"rbk23_router_firmware"},{"vendor":"netgear","product":"rbk23_satellite_firmware"},{"vendor":"netgear","product":"rbk23w_firmware"},{"vendor":"netgear","product":"rbk30_firmware"},{"vendor":"netgear","product":"rbk33_firmware"},{"vendor":"netgear","product":"rbk40_router_firmware"},{"vendor":"netgear","product":"rbk40_satellite_firmware"},{"vendor":"netgear","product":"rbk43_router_firmware"},{"vendor":"netgear","product":"rbk43_satellite_firmware"},{"vendor":"netgear","product":"rbk43s_router_firmware"},{"vendor":"netgear","product":"rbk43s_satellite_firmware"},{"vendor":"netgear","product":"rbk44_router_firmware"},{"vendor":"netgear","product":"rbk44_satellite_firmware"},{"vendor":"netgear","product":"rbk50_firmware"},{"vendor":"netgear","product":"rbk50v_firmware"},{"vendor":"netgear","product":"rbk52w_firmware"},{"vendor":"netgear","product":"rbr10_firmware"},{"vendor":"netgear","product":"rbr20_firmware"},{"vendor":"netgear","product":"rbr40_firmware"},{"vendor":"netgear","product":"rbr50_firmware"},{"vendor":"netgear","product":"rbs10_firmware"},{"vendor":"netgear","product":"rbs20_firmware"},{"vendor":"netgear","product":"rbs40_firmware"},{"vendor":"netgear","product":"rbs50_firmware"}],"references":[{"url":"https://www.zerodayinitiative.com/advisories/ZDI-20-1430/","tags":["x_refsource_MISC","x_transferred","Third Party Advisory","VDB Entry"]},{"url":"https://kb.netgear.com/000062507/Security-Advisory-for-Unauthenticated-Command-Injection-Vulnerability-on-Some-Extenders-and-Orbi-WiFi-Systems","tags":["x_refsource_MISC","x_transferred","Vendor Advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2020-27861"},{"url":"https://github.com/advisories/GHSA-jwqc-9f7p-v456"}],"sources":{"cve":[{"id":"CVE-2020-27861","description":"This vulnerability allows network-adjacent attackers to execute arbitrary code on affected installations of NETGEAR Orbi 2.5.1.16 routers. Authentication is not required to exploit this vulnerability. The specific flaw exists within the UA_Parser utility. A crafted Host Name option in a DHCP request can trigger execution of a system call composed from a user-supplied string. An attacker can leverage this vulnerability to execute code in the context of root. Was ZDI-CAN-11076.","status":"published","published":"2021-02-11T23:35:36Z","modified":"2024-08-04T16:25:43.503Z","cvss":[{"version":"3.0","score":8.8,"vector":"CVSS:3.0/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"high","assessor":"cna"}],"cwes":["CWE-78"],"updated_at":"2026-11-02T14:35:53.552996Z"}],"euvd":[{"id":"EUVD-2020-20354","description":"This vulnerability allows network-adjacent attackers to execute arbitrary code on affected installations of NETGEAR Orbi 2.5.1.16 routers. Authentication is not required to exploit this vulnerability. The specific flaw exists within the UA_Parser utility. A crafted Host Name option in a DHCP request can trigger execution of a system call composed from a user-supplied string. An attacker can leverage this vulnerability to execute code in the context of root. Was ZDI-CAN-11076.","status":"published","published":"2021-02-11T23:35:36Z","modified":"2024-08-04T16:25:43Z","cvss":[{"version":"3.0","score":8.8,"vector":"CVSS:3.0/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"high"}],"updated_at":"2026-11-03T03:07:11.320494Z"}],"ghsa":[{"id":"GHSA-jwqc-9f7p-v456","title":"This vulnerability allows network-adjacent attackers to execute arbitrary code on affected...","description":"This vulnerability allows network-adjacent attackers to execute arbitrary code on affected installations of NETGEAR Orbi 2.5.1.16 routers. Authentication is not required to exploit this vulnerability. The specific flaw exists within the UA_Parser utility. A crafted Host Name option in a DHCP request can trigger execution of a system call composed from a user-supplied string. An attacker can leverage this vulnerability to execute code in the context of root. Was ZDI-CAN-11076.","status":"published","published":"2022-05-24T17:42:01Z","modified":"2023-01-29T05:05:41Z","cwes":["CWE-78"],"updated_at":"2026-11-02T14:45:51.307262Z"}],"nvd":[{"id":"CVE-2020-27861","description":"This vulnerability allows network-adjacent attackers to execute arbitrary code on affected installations of NETGEAR Orbi 2.5.1.16 routers. Authentication is not required to exploit this vulnerability. The specific flaw exists within the UA_Parser utility. A crafted Host Name option in a DHCP request can trigger execution of a system call composed from a user-supplied string. An attacker can leverage this vulnerability to execute code in the context of root. Was ZDI-CAN-11076.","status":"published","published":"2021-02-12T00:15:12.5Z","modified":"2026-06-17T03:09:45.527Z","cvss":[{"version":"3.1","score":8.8,"vector":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"high","assessor":"primary"},{"version":"3.0","score":8.8,"vector":"CVSS:3.0/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"high","assessor":"secondary"},{"version":"2.0","score":8.3,"vector":"AV:A/AC:L/Au:N/C:C/I:C/A:C","level":"high","assessor":"primary"}],"cwes":["CWE-78"],"updated_at":"2026-11-02T14:06:34.188486Z"}]}}