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CVE-2021-27257

MEDIUM
6.5
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
MEDIUM6.5
Exploit prediction
EPSS 0.3%

Description

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.

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-21-264/

CVSS

6.5MEDIUM[email protected]
Attack Vector
ADJACENT_NETWORK
Complexity
LOW
Privileges
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
HIGH
Availability
NONE
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-295

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