{"cve":"CVE-2021-34947","nvd":{"published":"2024-05-07T23:15:07.653","modified":"2026-06-17T03:56:51.610","status":"Analyzed","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.","cvss_v4":null,"cvss_v3":{"version":"3.0","vector":"CVSS:3.0/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","score":8.8},"cwes":["CWE-787"],"references":["https://kb.netgear.com/000064044/Security-Advisory-for-Pre-Authentication-Buffer-Overflow-on-Some-Routers-PSV-2021-0129","https://www.zerodayinitiative.com/advisories/ZDI-21-1116/","https://kb.netgear.com/000064044/Security-Advisory-for-Pre-Authentication-Buffer-Overflow-on-Some-Routers-PSV-2021-0129","https://www.zerodayinitiative.com/advisories/ZDI-21-1116/"],"products":["netgear:d7800_firmware","netgear:ex2700_firmware","netgear:ex6100_firmware","netgear:ex6150_firmware","netgear:ex6200_firmware","netgear:ex6250_firmware","netgear:ex6400_firmware","netgear:ex6400v2_firmware","netgear:ex6410_firmware","netgear:ex6420_firmware","netgear:ex6500v1_firmware","netgear:ex7300_firmware","netgear:ex7300v2_firmware","netgear:ex7320_firmware","netgear:ex7700_firmware","netgear:ex8000_firmware","netgear:lbr1020_firmware","netgear:lbr20_firmware","netgear:r6700ax_firmware","netgear:r7800_firmware","netgear:r8900_firmware","netgear:r9000_firmware","netgear:rax10_firmware","netgear:rax120_firmware","netgear:rax120v2_firmware","netgear:rax70_firmware","netgear:rax78_firmware","netgear:rbr10_firmware","netgear:rbr20_firmware","netgear:rbr40_firmware","netgear:rbr50_firmware","netgear:rbs10_firmware","netgear:rbs20_firmware","netgear:rbs40_firmware","netgear:rbs50_firmware","netgear:rbs50y_firmware","netgear:wn3000rpv2_firmware","netgear:wnr2000v5_firmware","netgear:xr450_firmware","netgear:xr500_firmware","netgear:xr700_firmware"],"source":"nvd","synced_at":"2026-10-19T21:49:23.840078609+00:00"},"epss":{"cve":"CVE-2021-34947","score":0.00549,"percentile":0.45977,"date":"2026-10-31"},"kev":null,"osv":[],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}