{"id":"CVE-2021-27254","aliases":["EUVD-2021-14019","GHSA-qxg5-9hcj-qp59"],"status":"published","title":"This vulnerability allows network-adjacent attackers to bypass authentication on affected...","description":"This vulnerability allows network-adjacent attackers to bypass authentication on affected installations of NETGEAR R7800. Authentication is not required to exploit this vulnerability. The specific flaw exists within the apply_save.cgi endpoint. This issue results from the use of hard-coded encryption key. An attacker can leverage this vulnerability to execute arbitrary code in the context of root. Was ZDI-CAN-12287.","severity":{"version":"3.0","score":6.3,"vector":"CVSS:3.0/AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L","level":"medium","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-11","score":0.00516,"percentile":0.44404,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-259","CWE-798"],"published":"2021-03-05T20:00:23Z","modified":"2026-06-17T03:44:33Z","products":[{"vendor":"netgear","product":"br200_firmware"},{"vendor":"netgear","product":"br500_firmware"},{"vendor":"netgear","product":"d7800_firmware"},{"vendor":"netgear","product":"ex6100v2_firmware"},{"vendor":"netgear","product":"ex6150v2_firmware"},{"vendor":"netgear","product":"ex6250_firmware"},{"vendor":"netgear","product":"ex6400_firmware"},{"vendor":"netgear","product":"ex6400v2_firmware"},{"vendor":"netgear","product":"ex6410_firmware"},{"vendor":"netgear","product":"ex6420_firmware"},{"vendor":"netgear","product":"ex7300_firmware"},{"vendor":"netgear","product":"ex7300v2_firmware"},{"vendor":"netgear","product":"ex7320_firmware"},{"vendor":"netgear","product":"ex7700_firmware"},{"vendor":"netgear","product":"ex8000_firmware"},{"vendor":"netgear","product":"lbr20_firmware"},{"vendor":"netgear","product":"r7800"},{"vendor":"netgear","product":"r7800_firmware"},{"vendor":"netgear","product":"r8900_firmware"},{"vendor":"netgear","product":"r9000_firmware"},{"vendor":"netgear","product":"rbk12_firmware"},{"vendor":"netgear","product":"rbk13_firmware"},{"vendor":"netgear","product":"rbk14_firmware"},{"vendor":"netgear","product":"rbk15_firmware"},{"vendor":"netgear","product":"rbk20_firmware"},{"vendor":"netgear","product":"rbk23_firmware"},{"vendor":"netgear","product":"rbk40_firmware"},{"vendor":"netgear","product":"rbk43_firmware"},{"vendor":"netgear","product":"rbk43s_firmware"},{"vendor":"netgear","product":"rbk44_firmware"},{"vendor":"netgear","product":"rbk50_firmware"},{"vendor":"netgear","product":"rbk53_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"},{"vendor":"netgear","product":"rbs50y_firmware"},{"vendor":"netgear","product":"xr450_firmware"},{"vendor":"netgear","product":"xr500_firmware"},{"vendor":"netgear","product":"xr700_firmware"}],"references":[{"url":"https://www.zerodayinitiative.com/advisories/ZDI-21-252/","tags":["x_refsource_MISC","x_transferred","Third Party Advisory","VDB Entry"]},{"url":"https://kb.netgear.com/000062883/Security-Advisory-for-Multiple-Vulnerabilities-on-Some-Routers-Satellites-and-Extenders","tags":["x_refsource_MISC","x_transferred","Patch","Vendor Advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2021-27254"},{"url":"https://github.com/advisories/GHSA-qxg5-9hcj-qp59"}],"sources":{"cve":[{"id":"CVE-2021-27254","description":"This vulnerability allows network-adjacent attackers to bypass authentication on affected installations of NETGEAR R7800. Authentication is not required to exploit this vulnerability. The specific flaw exists within the apply_save.cgi endpoint. This issue results from the use of hard-coded encryption key. An attacker can leverage this vulnerability to execute arbitrary code in the context of root. Was ZDI-CAN-12287.","status":"published","published":"2021-03-05T20:00:23Z","modified":"2024-08-03T20:48:15.867Z","cvss":[{"version":"3.0","score":6.3,"vector":"CVSS:3.0/AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L","level":"medium","assessor":"cna"}],"cwes":["CWE-259"],"updated_at":"2026-11-02T14:33:04.360272Z"}],"euvd":[{"id":"EUVD-2021-14019","description":"This vulnerability allows network-adjacent attackers to bypass authentication on affected installations of NETGEAR R7800. Authentication is not required to exploit this vulnerability. The specific flaw exists within the apply_save.cgi endpoint. This issue results from the use of hard-coded encryption key. An attacker can leverage this vulnerability to execute arbitrary code in the context of root. Was ZDI-CAN-12287.","status":"published","published":"2021-03-05T20:00:23Z","modified":"2024-08-03T20:48:15Z","cvss":[{"version":"3.0","score":6.3,"vector":"CVSS:3.0/AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L","level":"medium"}],"updated_at":"2026-11-03T03:24:49.808499Z"}],"ghsa":[{"id":"GHSA-qxg5-9hcj-qp59","title":"This vulnerability allows network-adjacent attackers to bypass authentication on affected...","description":"This vulnerability allows network-adjacent attackers to bypass authentication on affected installations of NETGEAR R7800. Authentication is not required to exploit this vulnerability. The specific flaw exists within the apply_save.cgi endpoint. This issue results from the use of hard-coded encryption key. An attacker can leverage this vulnerability to execute arbitrary code in the context of root. Was ZDI-CAN-12287.","status":"published","published":"2022-05-24T17:43:46Z","modified":"2023-01-29T05:05:56Z","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"}],"cwes":["CWE-259","CWE-798"],"updated_at":"2026-11-02T14:45:54.702484Z"}],"nvd":[{"id":"CVE-2021-27254","description":"This vulnerability allows network-adjacent attackers to bypass authentication on affected installations of NETGEAR R7800. Authentication is not required to exploit this vulnerability. The specific flaw exists within the apply_save.cgi endpoint. This issue results from the use of hard-coded encryption key. An attacker can leverage this vulnerability to execute arbitrary code in the context of root. Was ZDI-CAN-12287.","status":"published","published":"2021-03-05T20:15:12.317Z","modified":"2026-06-17T03:44:33.453Z","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":6.3,"vector":"CVSS:3.0/AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L","level":"medium","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-259","CWE-798"],"updated_at":"2026-11-02T14:06:50.399901Z"}]}}