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CVE-2018-21162· NVD / CVE Program· CNA mitre

Certain NETGEAR devices are affected by command injection by an unauthenticated attacker.

Certain NETGEAR devices are affected by command injection by an unauthenticated attacker. This affects D6400 before 1.0.0.78, EX6200 before 1.0.3.86, EX7000 before 1.0.0.64, R6250 before 1.0.4.8, R6300v2 before 1.0.4.6, R6400 before 1.0.1.12, R6700 before 1.0.1.16, R7000 before 1.0.7.10, R7100LG before 1.0.0.42, R7300DST before 1.0.0.44, R7900 before 1.0.1.12, R8000 before 1.0.3.36, R8300 before 1.0.2.74, R8500 before 1.0.2.74, WNDR3400v3 before 1.0.1.14, and WNR3500Lv2 before 1.2.0.48.

CriticalCVSS 9.8 · v3.1—No exploit No fix recorded
Published
Apr 23, 2020
Updated
Jun 16, 2026
EPSS
3.4% · 89th percentile
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Report tools

JSON

Action score

40

Plan

Add it to your regular patch cycle.

CVSS
39 / 40 · 9.8 / 10
CISA KEV
0 / 30 · Not listed
EPSS
1 / 30 · 3.4%

CNA vs NVD score

NVD
9.8
CNA · mitre
8.8
1.0 point gap

CVSS:3.0/AC:L/AV:A/A:H/C:H/I:H/PR:N/S:U/UI:N

The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.

Noroxi analysis

No Noroxi analysis for this record yet

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Affected systems

VendorProduct
netgeard6400 firmware
netgeard6400
netgearex6200 firmware
netgearex6200
netgearex7000 firmware
netgearex7000
netgearr6250 firmware
netgearr6250
netgearr6300 firmware
netgearr6300
netgearr6400 firmware
netgearr6400

and 20 more

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • netgear d6400 firmwarebefore 1.0.0.78
  • netgear ex6200 firmwarebefore 1.0.3.86
  • netgear ex7000 firmwarebefore 1.0.0.64
  • netgear r6250 firmwarebefore 1.0.4.8
  • netgear r6300 firmwarebefore 1.0.4.6
  • netgear r6400 firmwarebefore 1.0.1.12
  • netgear r6700 firmwarebefore 1.0.1.16
  • netgear r7000 firmwarebefore 1.0.7.10
  • netgear r7100lg firmwarebefore 1.0.0.42
  • netgear r7300dst firmwarebefore 1.0.0.44
  • netgear r7900 firmwarebefore 1.0.1.12
  • netgear r8000 firmwarebefore 1.0.3.36
  • netgear r8300 firmwarebefore 1.0.2.74
  • netgear r8500 firmwarebefore 1.0.2.74
  • netgear wndr3400 firmwarebefore 1.0.1.14
  • netgear wnr3500l firmwarebefore 1.2.0.48

Same product

netgear: all records

Other highest-scoring records for the same primary product.

  • CVE-2019-20728Certain NETGEAR devices are affected by a buffer overflow by an authenticated user.
    26Monitor
  • CVE-2017-18700Certain NETGEAR devices are affected by stored XSS.
    24Monitor
  • CVE-2025-7407Netgear D6400 diag.cgi os command injection
    11Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

No fix version is recorded for this entry. Check the references for vendor advisories.

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

No nightly-computed relations.

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

Attack conditions

  • Anyone who can reach it over the internet can trigger it.
  • No account or password is required.
  • No user action is required.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
high · data can be read
Integrity
high · data or configuration can be modified
Availability
high · the service can be disrupted
Attack vector
Network
Attack complexity
Low
Privileges required
None
User interaction
None
Scope
Unchanged
Confidentiality impact
High
Integrity impact
High
Availability impact
High

Weakness class (CWE)

CWE-78 · Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

nvd-primary

Root cause

User input is inserted as text into a shell command. The shell may interpret special characters in the input as part of the command.

The bug in code

The whole CWE-78 class

A representative example of this vulnerability class. Not the vendor's source code; it shows the faulty pattern and its fix.

Vulnerable

ts
const host = req.body.host;exec("ping -c 1 " + host, onResult);

Fixed

ts
const host = req.body.host;if (!/^[a-z0-9.-]{1,253}$/i.test(host)) return res.sendStatus(400);execFile("ping", ["-c", "1", host], onResult);

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

ATT&CK techniques

—

Change log

No changes recorded on tracked fields yet. Score, KEV, exploit maturity and fix status changes appear here.

References

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records