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CVE-2021-27253

HIGH
8.8
CVSS Score
Published: April 14, 2021 at 03:45 PM UTC
Updated: June 17, 2026 at 03:44 AM UTC
84 products affected across 1 vendorR7800 FirmwareR9000 FirmwareD7800 Firmware

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Severity
HIGH8.8
Exploit prediction
EPSS 1%

Description

This vulnerability allows network-adjacent attackers to execute arbitrary code on affected installations of NETGEAR Nighthawk R7800. Although authentication is required to exploit this vulnerability, the existing authentication mechanism can be bypassed. The specific flaw exists within the handling of the rc_service parameter provided to apply_bind.cgi. The issue results from the lack of proper validation of a user-supplied string before using it to execute a system call. An attacker can leverage this vulnerability to execute code in the context of root. Was ZDI-CAN-12303.

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-ex6100-firmware (same device)
EX6150 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-ex6150 (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-ex6400 (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-21-249/

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-122CWE-787

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