CyberSecBulletin
CVE-2026-0403NVD status: Analyzed

An insufficient input validation vulnerability in NETGEAR Orbi routers allows attackers…

Published Updated By the CyberSecBulletin desk

CVE-2026-0403 is a high-severity improper input validation vulnerability in RBR750 from NETGEAR, with a CVSS 3.1 base score of 8.0 out of 10. It can be exploited from the same local network by an attacker with a low-privileged account, without any action from a user. Affected RBR750 versions: 4.6.14.3 and earlier. The record does not name a fixed version, so check the vendor advisory. There is no confirmed exploitation so far. EPSS estimates a 0.33% chance of exploitation within 30 days, which is low compared with other CVEs.

Next patch cycle

High severity with no evidence of exploitation so far.

What to do

  1. Update RBRE960 to v7.2.7.15 or a later version.
  2. Update RBSE960 to v7.2.7.15 or a later version.
  3. Update RBR850 to V7.2.8.5 or a later version.
  4. Read the advisory on kb.netgear.com for workarounds and exact fixed builds.

Affected products and versions

VendorProductAffected versionsFixed in
NETGEARRBR7504.6.14.3 and earlierNot stated
NETGEARRBS7504.6.14.3 and earlierNot stated
NETGEARRBRE960before v7.2.7.15v7.2.7.15
NETGEARRBSE960before v7.2.7.15v7.2.7.15
NETGEARRBR850before V7.2.8.5V7.2.8.5
NETGEARRBS850before V7.2.8.5V7.2.8.5
NETGEARRBE971before v9.10.0.2v9.10.0.2
NETGEARRBE970before v9.10.0.2v9.10.0.2
NETGEARRBR860before v7.2.8.5v7.2.8.5
NETGEARRBS860before v7.2.8.5v7.2.8.5
NETGEARRbe971 Firmwarebefore 9.10.0.29.10.0.2
NETGEARRbe970 Firmwarebefore 9.10.0.29.10.0.2
NETGEARRbr750 Firmwarebefore 7.2.8.57.2.8.5
NETGEARRbr850 Firmwarebefore 7.2.8.57.2.8.5
NETGEARRbr860 Firmwarebefore 7.2.8.57.2.8.5
NETGEARRbs750 Firmwarebefore 7.2.8.57.2.8.5
NETGEARRbs850 Firmwarebefore 7.2.8.57.2.8.5
NETGEARRbs860 Firmwarebefore 7.2.8.57.2.8.5
NETGEARRbre960 Firmwarebefore 7.2.8.57.2.8.5
NETGEARRbse960 Firmwarebefore 7.2.8.57.2.8.5

Version data comes from the organisation that assigned the CVE. Confirm against the vendor advisory before deciding you are unaffected.

How the severity score breaks down

Attack vector
AdjacentThe attacker must be on the same local network segment.
Attack complexity
LowNo special conditions are needed; the attack works reliably.
Privileges required
LowA basic user account is enough.
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
HighThe component can be taken down completely.

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

Scoring systemScoreSeverityScored by
CVSS 4.01.1LowCNA
CVSS 3.18.0HighNVD

Official description

An insufficient input validation vulnerability in NETGEAR Orbi routers allows attackers connected to the router's LAN to execute OS command injections.

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

The underlying weakness: Improper Input Validation

The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly.

How developers prevent this class of flaw

  • Consider using language-theoretic security (LangSec) techniques that characterize inputs using a formal language and build recognizers for that language. This effectively requires parsing to be a distinct layer that effectively enforces a boundary between raw input and internal data representations, instead of allowing parser code to be scattered throughout the program, where it could be subject to errors or inconsistencies that create weaknesses.
  • Use an input validation framework such as Struts or the OWASP ESAPI Validation API. Note that using a framework does not automatically address all input validation problems; be mindful of weaknesses that could arise from misusing the framework itself (CWE-1173).
  • Understand all the potential areas where untrusted inputs can enter the product, including but not limited to: parameters or arguments, cookies, anything read from the network, environment variables, reverse DNS lookups, query results, request headers, URL components, e-mail, files, filenames, databases, and any external systems that provide data to the application. Remember that such inputs may be obtained indirectly through API calls.

More Improper Input Validation vulnerabilities (CWE-20)

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 RBR750

All RBR750 vulnerabilities

Recent Improper Input Validation vulnerabilities

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