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CVE-2021-27254

HIGH
8.8
CVSS Score
Published: March 5, 2021 at 08:00 PM UTC
Updated: June 17, 2026 at 03:44 AM UTC
86 products affected across 1 vendorR7800 FirmwareR9000 FirmwareD7800 Firmware

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Severity
HIGH8.8
Exploit prediction
EPSS 0.5%

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

BR200 Firmware· NETGEAR
95%
v < 5.10.0.5
Affected range stops below 5.10.0.5, so it looks safe — our inference, not a vendor statement
netgear-br200 (same device)
BR500 Firmware· NETGEAR
95%
v < 5.10.0.5
Affected range stops below 5.10.0.5, so it looks safe — our inference, not a vendor statement
netgear-br500 (same device)
D7800 Firmware· NETGEAR
95%
v < 1.0.1.60
Affected range stops below 1.0.1.60, so it looks safe — our inference, not a vendor statement
netgear-d7800 (same device)
EX6100V2 Firmware· NETGEAR
95%
v < 1.0.1.98
Affected range stops below 1.0.1.98, so it looks safe — our inference, not a vendor statement
netgear-ex6100v2 (same device)
EX6150V2 Firmware· NETGEAR
95%
v < 1.0.1.98
Affected range stops below 1.0.1.98, so it looks safe — our inference, not a vendor statement
netgear-ex6150v2 (same device)
EX6250 Firmware· NETGEAR
95%
v < 1.0.0.134
Affected range stops below 1.0.0.134, so it looks safe — our inference, not a vendor statement
netgear-ex6250 (same device)
EX6400 Firmware· NETGEAR
95%
v < 1.0.2.158
Affected range stops below 1.0.2.158, so it looks safe — our inference, not a vendor statement
netgear-ex6400 (same device)
EX6400V2 Firmware· NETGEAR
95%
v < 1.0.0.134
Affected range stops below 1.0.0.134, so it looks safe — our inference, not a vendor statement
netgear-ex6400v2 (same device)
EX6410 Firmware· NETGEAR
95%
v < 1.0.0.134
Affected range stops below 1.0.0.134, so it looks safe — our inference, not a vendor statement
netgear-ex6410 (same device)
EX6420 Firmware· NETGEAR
95%
v < 1.0.0.134
Affected range stops below 1.0.0.134, so it looks safe — our inference, not a vendor statement
netgear-ex6420 (same device)

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

References (2)

x_refsource_MISCPatchVendor Advisory
Source: [email protected]
https://kb.netgear.com/000062883/Security-Advisory-for-Multiple-Vulnerabilities-on-Some-Routers-Satellites-and-Extenders
x_refsource_MISCThird Party AdvisoryVDB Entry
Source: [email protected]
https://www.zerodayinitiative.com/advisories/ZDI-21-252/

CVSS

8.8HIGH[email protected]
Attack Vector
ADJACENT_NETWORK
Complexity
LOW
Privileges
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
HIGH
Integrity
HIGH
Availability
HIGH
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-259CWE-798

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