CVE-2021-27251

8.8 highEPSS 0.7%

High (8.8) in netgear. EPSS 0.7% chance of exploitation in the next 30 days.

This vulnerability allows network-adjacent attackers to execute arbitrary code on affected installations of NETGEAR Nighthawk R7800. Authentication is not required to exploit this vulnerability The specific flaw exists within handling of firmware updates. The issue results from a fallback to a insecure protocol to deliver updates. An attacker can leverage this vulnerability to execute code in the context of root. Was ZDI-CAN-12308.

Severity

CVSS 3.1

8.8 high

CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS: 0.7% chance of exploitation in the next 30 days; higher than 54% of CVEs (scores of 2026-10-31)
CWE: CWE-319
Published: 2021-04-14
Modified: 2026-06-17
Record from: the NVD, synced 2026-10-19

Affected

netgear:br200_firmware
netgear:br500_firmware
netgear:d7800_firmware
netgear:ex6100v2_firmware
netgear:ex6150_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

References

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