How severe is CVE-2018-21158?

CVE-2018-21158 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-2018-21158 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (45th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2018-21158?

CVE-2018-21158 affects Netgear R7800 Firmware. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2018-21158?

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-2018-21158 published?

CVE-2018-21158 was published on 2020-04-27 and last updated on 2026-06-17.

CVE-2018-21158

CVE-2018-21158 is a high-severity vulnerability in Netgear R7800 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% (45th percentile)
Actively exploited: Not listed in CISA KEV
Affected product: Netgear R7800 Firmware
Published: 2020-04-27
Last modified: 2026-06-17

Description

NETGEAR R7800 devices before 1.0.2.46 are affected by incorrect configuration of security settings.

Frequently asked questions

What is CVE-2018-21158?: NETGEAR R7800 devices before 1.0.2.46 are affected by incorrect configuration of security settings.
How severe is CVE-2018-21158?: CVE-2018-21158 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-2018-21158 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (45th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2018-21158?: CVE-2018-21158 affects Netgear R7800 Firmware. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2018-21158?: 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-2018-21158 published?: CVE-2018-21158 was published on 2020-04-27 and last updated on 2026-06-17.

References

https://kb.netgear.com/000059472/Security-Advisory-for-Security-Misconfiguration-on-Some-Routers-PSV-2017-0700

Affected products (1)

cpe:2.3:o:netgear:r7800_firmware:*:*:*:*:*:*:*:*

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