CyberSecBulletin
CVE-2022-40619NVD status: Analyzed

Rbr20 Firmware: Improper Neutralization of Special Elements used in a Command

Published Updated By the CyberSecBulletin desk

CVE-2022-40619 is a high-severity improper neutralization of special elements used in a command vulnerability in Rbr20 Firmware from NETGEAR, with a CVSS 3.1 base score of 7.7 out of 10. It can be exploited remotely over the network by an unauthenticated attacker, without any action from a user. The record lists version 2.7.2.26 as the first without the flaw, so updating Rbr20 Firmware to that release or later removes the exposure. There is no confirmed exploitation so far. EPSS estimates a 2.53% chance of exploitation within 30 days, higher than 85% of scored CVEs.

Next patch cycle

High severity with no evidence of exploitation so far.

What to do

  1. Update Rbr20 Firmware to 2.7.2.26 or a later version.
  2. Update R6230 Firmware to 1.1.0.112 or a later version.
  3. Update R6260 Firmware to 1.1.0.88 or a later version.
  4. Read the advisory on kb.netgear.com for workarounds and exact fixed builds.
  5. Until you can update, restrict network access to the affected service so it is not reachable from untrusted networks.

Affected products and versions

VendorProductAffected versionsFixed in
NETGEARRbr20 Firmwarebefore 2.7.2.262.7.2.26
NETGEARR6230 Firmwarebefore 1.1.0.1121.1.0.112
NETGEARR6260 Firmwarebefore 1.1.0.881.1.0.88
NETGEARR7000 Firmwarebefore 1.0.11.1341.0.11.134
NETGEARR8900 Firmwarebefore 1.0.5.421.0.5.42
NETGEARR9000 Firmwarebefore 1.0.5.421.0.5.42
NETGEARRax120 Firmwarebefore 1.2.8.401.2.8.40
NETGEARRax120v2 Firmwarebefore 1.2.8.401.2.8.40
NETGEARXr300 Firmwarebefore 1.0.3.721.0.3.72
NETGEARRbs20 Firmwarebefore 2.7.2.262.7.2.26

Version data comes from NVD's product matching. Confirm against the vendor advisory before deciding you are unaffected.

How the severity score breaks down

Attack vector
NetworkCan be exploited remotely over a network, including the internet.
Attack complexity
HighSuccess depends on conditions outside the attacker's control.
Privileges required
NoneNo account or login is needed.
User interaction
NoneNo action by a victim is required.
Scope
UnchangedImpact stays within the vulnerable component.
Confidentiality
HighAll data handled by the component can be read.
Integrity
HighData or code can be modified at will.
Availability
LowPerformance or availability is reduced.

Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:L. Scored by CISA (ADP).

Official description

FunJSQ, a third-party module integrated on some NETGEAR routers and Orbi WiFi Systems, exposes an HTTP server over the LAN interface of affected devices. This interface is vulnerable to unauthenticated arbitrary command injection through the funjsq_access_token parameter. This affects R6230 before 1.1.0.112, R6260 before 1.1.0.88, R7000 before 1.0.11.134, R8900 before 1.0.5.42, R9000 before 1.0.5.42, and XR300 before 1.0.3.72 and Orbi RBR20 before 2.7.2.26, RBR50 before 2.7.4.26, RBS20 before 2.7.2.26, and RBS50 before 2.7.4.26.

Source: the CVE record as published by its numbering authority, via NVD and CVE.org.

The underlying weakness: Improper Neutralization of Special Elements used in a Command

The product constructs all or part of a command using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the intended command when it is sent to a downstream component.

How developers prevent this class of flaw

  • If at all possible, use library calls rather than external processes to recreate the desired functionality.
  • If possible, ensure that all external commands called from the program are statically created.
  • Run time: Run time policy enforcement may be used in an allowlist fashion to prevent use of any non-sanctioned commands.

More Improper Neutralization of Special Elements used in a Command vulnerabilities (CWE-77)

Timeline

  1. CVE record published.
  2. CISA published its SSVC assessment (exploitation: none, automatable: no, technical impact: total).
  3. Record last changed materially (score, affected products, status or references).

References

Other vulnerabilities in Rbr20 Firmware

All Rbr20 Firmware vulnerabilities

Recent Improper Neutralization of Special Elements used in a Command vulnerabilities

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