How severe is CVE-2018-21138?

CVE-2018-21138 has a CVSS 3.x base score of 8.8, rated high severity. It is exploitable over an adjacent network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2018-21138 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (49th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2018-21138?

CVE-2018-21138 primarily affects Netgear D3600 Firmware. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2018-21138?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

When was CVE-2018-21138 published?

CVE-2018-21138 was published on 2020-04-23 and last updated on 2026-06-17.

CVE-2018-21138

CVE-2018-21138 is a high-severity vulnerability in Netgear D3600 Firmware with a CVSS 3.x base score of 8.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low.

Key facts

Severity: High (CVSS 3.x base score 8.8)
CVSS v2: 5.8
EPSS exploit prediction: 1% (49th percentile)
Actively exploited: Not listed in CISA KEV
Affected product: Netgear D3600 Firmware
Published: 2020-04-23
Last modified: 2026-06-17

Description

Certain NETGEAR devices are affected by incorrect configuration of security settings. This affects D3600 before 1.0.0.76 and D6000 before 1.0.0.76.

Frequently asked questions

What is CVE-2018-21138?: Certain NETGEAR devices are affected by incorrect configuration of security settings. This affects D3600 before 1.0.0.76 and D6000 before 1.0.0.76.
How severe is CVE-2018-21138?: CVE-2018-21138 has a CVSS 3.x base score of 8.8, rated high severity. It is exploitable over an adjacent network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2018-21138 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (49th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2018-21138?: CVE-2018-21138 primarily affects Netgear D3600 Firmware. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2018-21138?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2018-21138 published?: CVE-2018-21138 was published on 2020-04-23 and last updated on 2026-06-17.

References

https://kb.netgear.com/000060222/Security-Advisory-for-Security-Misconfiguration-on-Some-Routers-PSV-2018-0098

Affected products (2)

cpe:2.3:o:netgear:d3600_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:netgear:d6000_firmware:*:*:*:*:*:*:*:*

More vulnerabilities in Netgear D3600 Firmware

CVE-2018-21137 — Critical (CVSS 9.8): Certain NETGEAR devices are affected by a hardcoded password. This affects D3600 before 1.0.0.76 and D6000 before…
CVE-2019-20730 — Critical (CVSS 9.8): Certain NETGEAR devices are affected by SQL injection. This affects D3600 before 1.0.0.68, D6000 before 1.0.0.68, D6200…
CVE-2020-35799 — High (CVSS 8.8): Certain NETGEAR devices are affected by a stack-based buffer overflow by an unauthenticated attacker. This affects…
CVE-2018-21224 — High (CVSS 8.8): Certain NETGEAR devices are affected by a buffer overflow by an unauthenticated attacker. This affects D3600 before…
CVE-2018-21223 — High (CVSS 8.8): Certain NETGEAR devices are affected by a buffer overflow by an unauthenticated attacker. This affects D3600 before…
CVE-2018-21222 — High (CVSS 8.8): Certain NETGEAR devices are affected by a buffer overflow by an unauthenticated attacker. This affects D3600 before…

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