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Vulnerability record · CVE-2018-21162 · published 23 April 2020

CVE-2018-21162: Netgear d6400 firmware os command injection vulnerability

Netgear · D6400 Firmware

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.

9.8 CVSS 3.1 Critical EPSS 3.4% · top 11.5% CWE-78 · OS command injection
9.8CVSS 3.1 base score, v2 7.5
3.4%EPSS exploitation probability, 30 days
NoNot in CISA KEV
16Affected product versions listed by NVD
2References
17 Jun 2026Last modified by NVD

Description

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.

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

Affected products

16 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://kb.netgear.com/000059147/Security-Advisory-for-Pre-Authentication-Command-Injection-on-Some-Gateways-Routers-and Vendor Advisory
https://kb.netgear.com/000059147/Security-Advisory-for-Pre-Authentication-Command-Injection-on-Some-Gateways-Routers-and Vendor Advisory

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

8.8CVE-2016-6277NETGEAR router cgi-bin command injection allows remote code executionMultiple NETGEAR router models fail to sanitize shell metacharacters in the path info passed to cgi-bin/, allowing remote command execution. The flaw…KEVEPSS 100%analysed8.1CVE-2017-5521NETGEAR router web management password disclosure via recovery tokenMultiple NETGEAR router models expose the admin password through the web management server. When authentication is canceled and password recovery is …KEVEPSS 89%analysed9.8CVE-2023-34563Netgear r6250 firmware classic buffer overflow vulnerabilitynetgear R6250 Firmware Version 1.0.4.48 is vulnerable to Buffer Overflow after authentication.EPSS 14%9.8CVE-2023-33532Netgear r6250 firmware command injection vulnerabilityThere is a command injection vulnerability in the Netgear R6250 router with Firmware Version 1.0.4.48. If an attacker gains web management privileges…EPSS 16%9.8CVE-2021-45638Netgear d6220 firmware out-of-bounds write vulnerabilityCertain NETGEAR devices are affected by a stack-based buffer overflow by an unauthenticated attacker. This affects D6220 before 1.0.0.68, D6400 befor…EPSS 1.5%9.8CVE-2021-45610Netgear d6220 firmware classic buffer overflow vulnerabilityCertain NETGEAR devices are affected by a buffer overflow by an unauthenticated attacker. This affects D6220 before 1.0.0.66, D6400 before 1.0.0.100,…EPSS 1.4%9.8CVE-2021-45621Netgear cbr40 firmware command injection vulnerabilityCertain NETGEAR devices are affected by command injection by an unauthenticated attacker. This affects CBR40 before 2.5.0.24, CBR750 before 3.2.18.2,…EPSS 2.0%9.8CVE-2021-45609Netgear d8500 firmware classic buffer overflow vulnerabilityCertain NETGEAR devices are affected by a buffer overflow by an unauthenticated attacker. This affects D8500 before 1.0.3.58, R6250 before 1.0.4.48, …EPSS 1.2%

Source: NIST National Vulnerability Database (record CVE-2018-21162), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.