CVE-2021-27257
NETGEAR · published 2021-03-05
Source record Collected from the National Vulnerability Database (NVD)
Description
Description by Zero Day Initiative via the CVE Program.
This vulnerability allows network-adjacent attackers to compromise the integrity of downloaded information on affected installations of NETGEAR R7800 firmware version 1.0.2.76. Authentication is not required to exploit this vulnerability. The specific flaw exists within the downloading of files via FTP. The issue results from the lack of proper validation of the certificate presented by the server. An attacker can leverage this in conjunction with other vulnerabilities to execute arbitrary code in the context of root. Was ZDI-CAN-12362.
Filed by Zero Day Initiative; not a statement by NETGEAR.
Status at the source
- NVD status: Modified
Affected products, as the source lists them
| Vendor | Product | Versions |
|---|---|---|
| NETGEAR | R7800 | firmware version 1.0.2.76: affected |
Products named in NVD's CPE match criteria (43)
cpe:2.3:o:netgear:br200_firmware:*:*:*:*:*:*:*:*cpe:2.3:o:netgear:br500_firmware:*:*:*:*:*:*:*:*cpe:2.3:o:netgear:d7800_firmware:*:*:*:*:*:*:*:*cpe:2.3:o:netgear:ex6100v2_firmware:*:*:*:*:*:*:*:*cpe:2.3:o:netgear:ex6150v2_firmware:*:*:*:*:*:*:*:*cpe:2.3:o:netgear:ex6250_firmware:*:*:*:*:*:*:*:*cpe:2.3:o:netgear:ex6400_firmware:*:*:*:*:*:*:*:*cpe:2.3:o:netgear:ex6400v2_firmware:*:*:*:*:*:*:*:*cpe:2.3:o:netgear:ex6410_firmware:*:*:*:*:*:*:*:*cpe:2.3:o:netgear:ex6420_firmware:*:*:*:*:*:*:*:*cpe:2.3:o:netgear:ex7300_firmware:*:*:*:*:*:*:*:*cpe:2.3:o:netgear:ex7300v2_firmware:*:*:*:*:*:*:*:*cpe:2.3:o:netgear:ex7320_firmware:*:*:*:*:*:*:*:*cpe:2.3:o:netgear:ex7700_firmware:*:*:*:*:*:*:*:*cpe:2.3:o:netgear:ex8000_firmware:*:*:*:*:*:*:*:*cpe:2.3:o:netgear:lbr20_firmware:*:*:*:*:*:*:*:*cpe:2.3:o:netgear:r7800_firmware:*:*:*:*:*:*:*:*cpe:2.3:o:netgear:r8900_firmware:*:*:*:*:*:*:*:*cpe:2.3:o:netgear:r9000_firmware:*:*:*:*:*:*:*:*cpe:2.3:o:netgear:rbk12_firmware:*:*:*:*:*:*:*:*cpe:2.3:o:netgear:rbk13_firmware:*:*:*:*:*:*:*:*cpe:2.3:o:netgear:rbk14_firmware:*:*:*:*:*:*:*:*cpe:2.3:o:netgear:rbk15_firmware:*:*:*:*:*:*:*:*cpe:2.3:o:netgear:rbk20_firmware:*:*:*:*:*:*:*:*cpe:2.3:o:netgear:rbk23_firmware:*:*:*:*:*:*:*:*cpe:2.3:o:netgear:rbk40_firmware:*:*:*:*:*:*:*:*cpe:2.3:o:netgear:rbk43_firmware:*:*:*:*:*:*:*:*cpe:2.3:o:netgear:rbk43s_firmware:*:*:*:*:*:*:*:*cpe:2.3:o:netgear:rbk44_firmware:*:*:*:*:*:*:*:*cpe:2.3:o:netgear:rbk50_firmware:*:*:*:*:*:*:*:*cpe:2.3:o:netgear:rbk53_firmware:*:*:*:*:*:*:*:*cpe:2.3:o:netgear:rbr10_firmware:*:*:*:*:*:*:*:*cpe:2.3:o:netgear:rbr20_firmware:*:*:*:*:*:*:*:*cpe:2.3:o:netgear:rbr40_firmware:*:*:*:*:*:*:*:*cpe:2.3:o:netgear:rbr50_firmware:*:*:*:*:*:*:*:*cpe:2.3:o:netgear:rbs10_firmware:*:*:*:*:*:*:*:*cpe:2.3:o:netgear:rbs20_firmware:*:*:*:*:*:*:*:*cpe:2.3:o:netgear:rbs40_firmware:*:*:*:*:*:*:*:*cpe:2.3:o:netgear:rbs50_firmware:*:*:*:*:*:*:*:*cpe:2.3:o:netgear:rbs50y_firmware:*:*:*:*:*:*:*:*cpe:2.3:o:netgear:xr450_firmware:*:*:*:*:*:*:*:*cpe:2.3:o:netgear:xr500_firmware:*:*:*:*:*:*:*:*cpe:2.3:o:netgear:xr700_firmware:*:*:*:*:*:*:*:*
DeSpy has not checked any unit, hardware revision or firmware. A product missing here is not a statement that it is unaffected.
Scores, as their sources published them
- CVSS 3.1: 6.5 MEDIUM — as published by NIST (Primary)
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N - CVSS 3.0: 6.5 MEDIUM — as published by Zero Day Initiative (Secondary)
CVSS:3.0/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N - CVSS 2.0: 3.3 LOW — as published by NIST (Primary)
AV:A/AC:L/Au:N/C:N/I:P/A:N
DeSpy does not score records. These are the sources' own values.
Weaknesses
Sources
References the source lists
- https://kb.netgear.com/000062883/Security-Advisory-for-Multiple-Vulnerabilities-on-Some-Routers-Satellites-and-Extenders
- https://www.zerodayinitiative.com/advisories/ZDI-21-264/
- https://kb.netgear.com/000062883/Security-Advisory-for-Multiple-Vulnerabilities-on-Some-Routers-Satellites-and-Extenders
- https://www.zerodayinitiative.com/advisories/ZDI-21-264/
Source dates: published 2021-03-05, last changed 2026-06-17. DeSpy's copy of this version is dated 2026-09-28.
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