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CVE-2020-27861

HIGH
8.8
CVSS Score
Published: February 11, 2021 at 11:35 PM UTC
Updated: June 17, 2026 at 03:09 AM UTC
72 products affected across 1 vendorRBR50 FirmwareRBS50 FirmwareRBK50 Firmware

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Severity
HIGH8.8
Exploit prediction
EPSS 2%

Description

This vulnerability allows network-adjacent attackers to execute arbitrary code on affected installations of NETGEAR Orbi 2.5.1.16 routers. Authentication is not required to exploit this vulnerability. The specific flaw exists within the UA_Parser utility. A crafted Host Name option in a DHCP request can trigger execution of a system call composed from a user-supplied string. An attacker can leverage this vulnerability to execute code in the context of root. Was ZDI-CAN-11076.

Affected

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

CBK40 Firmware· NETGEAR
95%
v < 2.6.1.38
Affected range stops below 2.6.1.38, so it looks safe — our inference, not a vendor statement
netgear-cbk40 (same device)
CBK43 Firmware· NETGEAR
95%
v < 2.6.1.38
Affected range stops below 2.6.1.38, so it looks safe — our inference, not a vendor statement
netgear-cbk43 (same device)
CBR40 Firmware· NETGEAR
95%
v < 2.6.1.38
Affected range stops below 2.6.1.38, so it looks safe — our inference, not a vendor statement
netgear-cbr40 (same device)
EX6200 Firmware· NETGEAR
95%
v < 1.0.1.82
Affected range stops below 1.0.1.82, so it looks safe — our inference, not a vendor statement
EX7700 Firmware· NETGEAR
95%
v < 1.0.0.210
Affected range stops below 1.0.0.210, so it looks safe — our inference, not a vendor statement
netgear-ex7700 (same device)
EX8000 Firmware· NETGEAR
95%
v < 1.0.1.224
Affected range stops below 1.0.1.224, so it looks safe — our inference, not a vendor statement
netgear-ex8000 (same device)
RBK12 Firmware· NETGEAR
95%
v < 2.6.1.44
Affected range stops below 2.6.1.44, so it looks safe — our inference, not a vendor statement
netgear-rbk12 (same device)
RBK13 Firmware· NETGEAR
95%
v < 2.6.1.44
Affected range stops below 2.6.1.44, so it looks safe — our inference, not a vendor statement
netgear-rbk13 (same device)
RBK14 Firmware· NETGEAR
95%
v < 2.6.1.44
Affected range stops below 2.6.1.44, so it looks safe — our inference, not a vendor statement
netgear-rbk14 (same device)
RBK15 Firmware· NETGEAR
95%
v < 2.6.1.44
Affected range stops below 2.6.1.44, so it looks safe — our inference, not a vendor statement
netgear-rbk15 (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_MISCVendor Advisory
Source: [email protected]
https://kb.netgear.com/000062507/Security-Advisory-for-Unauthenticated-Command-Injection-Vulnerability-on-Some-Extenders-and-Orbi-WiFi-Systems
x_refsource_MISCThird Party AdvisoryVDB Entry
Source: [email protected]
https://www.zerodayinitiative.com/advisories/ZDI-20-1430/

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-78

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