CVE-2021-27254

highpriority · track · 35OT risk · elevatedEPSS 0.005 · 44 %ileEUUS

grimoire priorityP2 · Scheduled

Exploitable?

—

no known exploitation

Likely / severe?

0.52% (44th) EPSS

CVSS 8.3 · high

Is it mine?

44 products

Check your exposure

Who says so?

3 sources

cnnvd · enisa_euvd · nvd

EPSS · scored 2026-10-27

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.

cvss

Technical severity, 0–10. One row per scoring source.

8.8

010

base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · medium–high · 6.3–8.8

v2.08.3highAV:A/AC:L/Au:N/C:C/I:C/A:Cprimary · NVD / NIST USexploitability 6.5 · impact 10

v3.18.8highCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:Hprimary · NVD / NIST USexploitability 2.8 · impact 5.9

v3.06.3mediumCVSS:3.0/AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:Lsecondary · ENISA EU

v3.06.3mediumCVSS:3.0/AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:Lsecondary · zdi-disclosures@trendmicro.comexploitability 2.8 · impact 3.4

v3.18.1highCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:Usecondary · CVSS-BT (t0sche)

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-798USprimaryCWE-259US

affected products (44)

Products and version ranges known to be affected.

NETGEAR R7800≤ firmware version 1.0.2.76enisa_euvdEU
netgear br200 firmware< 5.10.0.5nvdUScpe:2.3:o:netgear:br200_firmware:*:*:*:*:*:*:*:*
netgear br500 firmware< 5.10.0.5nvdUScpe:2.3:o:netgear:br500_firmware:*:*:*:*:*:*:*:*
netgear d7800 firmware< 1.0.1.60nvdUScpe:2.3:o:netgear:d7800_firmware:*:*:*:*:*:*:*:*
netgear ex6100v2 firmware< 1.0.1.98nvdUScpe:2.3:o:netgear:ex6100v2_firmware:*:*:*:*:*:*:*:*
netgear ex6150v2 firmware< 1.0.1.98nvdUScpe:2.3:o:netgear:ex6150v2_firmware:*:*:*:*:*:*:*:*
netgear ex6250 firmware< 1.0.0.134nvdUScpe:2.3:o:netgear:ex6250_firmware:*:*:*:*:*:*:*:*
netgear ex6400 firmware< 1.0.2.158nvdUScpe:2.3:o:netgear:ex6400_firmware:*:*:*:*:*:*:*:*
netgear ex6400v2 firmware< 1.0.0.134nvdUScpe:2.3:o:netgear:ex6400v2_firmware:*:*:*:*:*:*:*:*
netgear ex6410 firmware< 1.0.0.134nvdUScpe:2.3:o:netgear:ex6410_firmware:*:*:*:*:*:*:*:*
netgear ex6420 firmware< 1.0.0.134nvdUScpe:2.3:o:netgear:ex6420_firmware:*:*:*:*:*:*:*:*
netgear ex7300 firmware< 1.0.2.158nvdUScpe:2.3:o:netgear:ex7300_firmware:*:*:*:*:*:*:*:*
netgear ex7300v2 firmware< 1.0.0.134nvdUScpe:2.3:o:netgear:ex7300v2_firmware:*:*:*:*:*:*:*:*
netgear ex7320 firmware< 1.0.0.134nvdUScpe:2.3:o:netgear:ex7320_firmware:*:*:*:*:*:*:*:*
netgear ex7700 firmware< 1.0.0.216nvdUScpe:2.3:o:netgear:ex7700_firmware:*:*:*:*:*:*:*:*
netgear ex8000 firmware< 1.0.1.232nvdUScpe:2.3:o:netgear:ex8000_firmware:*:*:*:*:*:*:*:*
netgear lbr20 firmware< 2.6.3.50nvdUScpe:2.3:o:netgear:lbr20_firmware:*:*:*:*:*:*:*:*
netgear r7800 firmware< 1.0.2.80nvdUScpe:2.3:o:netgear:r7800_firmware:*:*:*:*:*:*:*:*
netgear r8900 firmware< 1.0.5.28nvdUScpe:2.3:o:netgear:r8900_firmware:*:*:*:*:*:*:*:*
netgear r9000 firmware< 1.0.5.28nvdUScpe:2.3:o:netgear:r9000_firmware:*:*:*:*:*:*:*:*

showing 20 of 44

also known as (3)

Other names and identifiers for this entity.

sources

Which sources assert this record, and when.

cnnvd enisa_euvd nvd NVD CVE.org MITRE

published 2021-03-05modified 2026-06-17

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+2276 more

references (7)

External citations — patches, advisories, analysis.

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