{"id":"CVE-2021-34947","aliases":["EUVD-2021-21594","GHSA-jj28-565j-58r3"],"status":"published","title":"NETGEAR R7800 net-cgi Out-Of-Bounds Write Remote Code Execution Vulnerability","description":"NETGEAR R7800 net-cgi Out-Of-Bounds Write Remote Code Execution Vulnerability. This vulnerability allows network-adjacent attackers to execute arbitrary code on affected installations of NETGEAR R7800 routers. Authentication is not required to exploit this vulnerability.\n\nThe specific flaw exists within the parsing of the soap_block_table file. The issue results from the lack of proper validation of user-supplied data, which can result in a write past the end of an allocated data structure. An attacker can leverage this vulnerability to execute code in the context of root.\n. Was ZDI-CAN-13055.","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":"2026-11-11","score":0.00549,"percentile":0.46417,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-787"],"published":"2024-05-07T22:54:22Z","modified":"2026-06-17T03:56:51Z","products":[{"vendor":"netgear","product":"d7800_firmware"},{"vendor":"netgear","product":"ex2700_firmware"},{"vendor":"netgear","product":"ex6100_firmware"},{"vendor":"netgear","product":"ex6150_firmware"},{"vendor":"netgear","product":"ex6200_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":"ex6500v1_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":"lbr1020_firmware"},{"vendor":"netgear","product":"lbr20_firmware"},{"vendor":"netgear","product":"r6700ax_firmware"},{"vendor":"netgear","product":"r7800"},{"vendor":"netgear","product":"r7800_firmware"},{"vendor":"netgear","product":"r8900_firmware"},{"vendor":"netgear","product":"r9000_firmware"},{"vendor":"netgear","product":"rax10_firmware"},{"vendor":"netgear","product":"rax120_firmware"},{"vendor":"netgear","product":"rax120v2_firmware"},{"vendor":"netgear","product":"rax70_firmware"},{"vendor":"netgear","product":"rax78_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":"wn3000rpv2_firmware"},{"vendor":"netgear","product":"wnr2000v5_firmware"},{"vendor":"netgear","product":"xr450_firmware"},{"vendor":"netgear","product":"xr500_firmware"},{"vendor":"netgear","product":"xr700_firmware"}],"references":[{"url":"https://www.zerodayinitiative.com/advisories/ZDI-21-1116/","tags":["x_research-advisory","x_transferred","Third Party Advisory"]},{"url":"https://kb.netgear.com/000064044/Security-Advisory-for-Pre-Authentication-Buffer-Overflow-on-Some-Routers-PSV-2021-0129","tags":["vendor-advisory","x_transferred","Third Party Advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2021-34947"},{"url":"https://www.zerodayinitiative.com/advisories/ZDI-21-1116"},{"url":"https://github.com/advisories/GHSA-jj28-565j-58r3"}],"sources":{"cve":[{"id":"CVE-2021-34947","title":"NETGEAR R7800 net-cgi Out-Of-Bounds Write Remote Code Execution Vulnerability","description":"NETGEAR R7800 net-cgi Out-Of-Bounds Write Remote Code Execution Vulnerability. This vulnerability allows network-adjacent attackers to execute arbitrary code on affected installations of NETGEAR R7800 routers. Authentication is not required to exploit this vulnerability.\n\nThe specific flaw exists within the parsing of the soap_block_table file. The issue results from the lack of proper validation of user-supplied data, which can result in a write past the end of an allocated data structure. An attacker can leverage this vulnerability to execute code in the context of root.\n. Was ZDI-CAN-13055.","status":"published","published":"2024-05-07T22:54:22.897Z","modified":"2024-08-04T00:26:55.741Z","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-787"],"updated_at":"2026-11-02T14:33:11.59359Z"}],"euvd":[{"id":"EUVD-2021-21594","description":"NETGEAR R7800 net-cgi Out-Of-Bounds Write Remote Code Execution Vulnerability. This vulnerability allows network-adjacent attackers to execute arbitrary code on affected installations of NETGEAR R7800 routers. Authentication is not required to exploit this vulnerability.\n\nThe specific flaw exists within the parsing of the soap_block_table file. The issue results from the lack of proper validation of user-supplied data, which can result in a write past the end of an allocated data structure. An attacker can leverage this vulnerability to execute code in the context of root.\n. Was ZDI-CAN-13055.","status":"published","published":"2024-05-07T22:54:22Z","modified":"2024-08-04T00:26:55Z","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":"2026-11-03T03:24:31.533826Z"}],"ghsa":[{"id":"GHSA-jj28-565j-58r3","title":"NETGEAR R7800 net-cgi Out-Of-Bounds Write Remote Code Execution Vulnerability. This vulnerability...","description":"NETGEAR R7800 net-cgi Out-Of-Bounds Write Remote Code Execution Vulnerability. This vulnerability allows network-adjacent attackers to execute arbitrary code on affected installations of NETGEAR R7800 routers. Authentication is not required to exploit this vulnerability.\n\nThe specific flaw exists within the parsing of the soap_block_table file. The issue results from the lack of proper validation of user-supplied data, which can result in a write past the end of an allocated data structure. An attacker can leverage this vulnerability to execute code in the context of root.\n. Was ZDI-CAN-13055.","status":"published","published":"2024-05-08T00:31:13Z","modified":"2024-05-08T00:31:21Z","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"}],"cwes":["CWE-787"],"updated_at":"2026-11-02T14:57:20.289371Z"}],"nvd":[{"id":"CVE-2021-34947","description":"NETGEAR R7800 net-cgi Out-Of-Bounds Write Remote Code Execution Vulnerability. This vulnerability allows network-adjacent attackers to execute arbitrary code on affected installations of NETGEAR R7800 routers. Authentication is not required to exploit this vulnerability.\n\nThe specific flaw exists within the parsing of the soap_block_table file. The issue results from the lack of proper validation of user-supplied data, which can result in a write past the end of an allocated data structure. An attacker can leverage this vulnerability to execute code in the context of root.\n. Was ZDI-CAN-13055.","status":"published","published":"2024-05-07T23:15:07.653Z","modified":"2026-06-17T03:56:51.61Z","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":"secondary"}],"cwes":["CWE-787"],"updated_at":"2026-11-02T14:07:08.163458Z"}]}}