{"id":"CVE-2021-27254","url":"https://www.cyber-defence.io/tools/cve/CVE-2021-27254","generatedAt":"2026-10-27T20:22:43.464Z","title":"This vulnerability allows network-adjacent attackers to bypass authentication on affected installations of NETGEAR R7800.","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.","published":"2021-03-05T20:15:12.000Z","lastModified":"2026-06-17T03:44:33.000Z","status":"Modified","sourceIdentifier":"zdi-disclosures@trendmicro.com","cvss":{"version":"3.1","score":8.8,"severity":"HIGH","vector":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"},"cwe":["CWE-259","CWE-798"],"affected":["netgear/br200 firmware","netgear/br500 firmware","netgear/d7800 firmware","netgear/ex6100v2 firmware","netgear/ex6150v2 firmware","netgear/ex6250 firmware","netgear/ex6400 firmware","netgear/ex6400v2 firmware","netgear/ex6410 firmware","netgear/ex6420 firmware","netgear/ex7300 firmware","netgear/ex7300v2 firmware","netgear/ex7320 firmware","netgear/ex7700 firmware","netgear/ex8000 firmware","netgear/lbr20 firmware","netgear/r7800 firmware","netgear/r8900 firmware","netgear/r9000 firmware","netgear/rbk12 firmware","netgear/rbk13 firmware","netgear/rbk14 firmware","netgear/rbk15 firmware","netgear/rbk20 firmware","netgear/rbk23 firmware","netgear/rbk40 firmware","netgear/rbk43 firmware","netgear/rbk43s firmware","netgear/rbk44 firmware","netgear/rbk50 firmware","netgear/rbk53 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/xr450 firmware","netgear/xr500 firmware","netgear/xr700 firmware"],"epss":{"score":0.00516,"percentile":0.43683,"date":"2026-10-26","history":[]},"kev":{"listed":false},"exploits":{"count":0,"verified":false,"firstPublished":null,"source":"Exploit-DB (https://gitlab.com/exploit-database/exploitdb)","entries":[]},"verdict":{"level":"high","text":"High impact if exploited, but EPSS currently rates exploitation as unlikely (0.52%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit."},"changes":[],"references":[{"url":"https://kb.netgear.com/000062883/Security-Advisory-for-Multiple-Vulnerabilities-on-Some-Routers-Satellites-and-Extenders","tags":["Patch","Vendor Advisory"],"source":"zdi-disclosures@trendmicro.com"},{"url":"https://www.zerodayinitiative.com/advisories/ZDI-21-252/","tags":["Third Party Advisory","VDB Entry"],"source":"zdi-disclosures@trendmicro.com"},{"url":"https://kb.netgear.com/000062883/Security-Advisory-for-Multiple-Vulnerabilities-on-Some-Routers-Satellites-and-Extenders","tags":["Patch","Vendor Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://www.zerodayinitiative.com/advisories/ZDI-21-252/","tags":["Third Party Advisory","VDB Entry"],"source":"af854a3a-2127-422b-91ae-364da2661108"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2021-27254","epss":"https://www.first.org/epss/","kev":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog","exploitdb":"https://www.exploit-db.com/"},"licence":"CC BY 4.0 — link back to the CVE Explorer if you publish the results; upstream data remains subject to its own terms."}