Is CVE-2018-21171 in the CISA KEV catalog?

No. CVE-2018-21171 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2018-21171?

CVE-2018-21171 has a CVSS v3 base score of 6.8 (MEDIUM).

What is the EPSS score for CVE-2018-21171?

CVE-2018-21171 has an EPSS score of 0.63% (46th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2018-21171?

Upgrade d6100 firmware to 1.0.0.57 or later. Fixes are available for 5 affected products.

CVE & CISA-KEV Catalog

CVE-2018-21171

MEDIUM

6.8

CVSS v3

NVD

Description

Certain NETGEAR devices are affected by a stack-based buffer overflow by an authenticated user. This affects D6100 before 1.0.0.57, R7800 before 1.0.2.40, R9000 before 1.0.3.6, WNDR3700v4 before 1.0.2.92, and WNDR4300 before 1.0.2.98.

CWE-787Out-of-bounds Write

How to fix

Remediation Available

d6100 firmwareNVD

Affected:< 1.0.0.57Fixed in:1.0.0.57CVE-2018-21171derived from NVD

r7800 firmwareNVD

Affected:< 1.0.2.40Fixed in:1.0.2.40CVE-2018-21171derived from NVD

r9000 firmwareNVD

Affected:< 1.0.2.40Fixed in:1.0.2.40CVE-2018-21171derived from NVD

wndr3700 firmwareNVD

Affected:< 1.0.2.92Fixed in:1.0.2.92CVE-2018-21171derived from NVD

wndr4300 firmwareNVD

Affected:< 1.0.2.98Fixed in:1.0.2.98CVE-2018-21171derived from NVD

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorAdjacent

Attack ComplexityLow

Privileges RequiredHigh

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityHigh

IntegrityHigh

AvailabilityHigh

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

Exploit Intelligence

0.63%probability of exploitation in 30 days

46thpercentile

Moderate risk: more likely to be exploited than 46% of all known CVEs.

References

Vendor Advisory1

kb.netgear.com

Related Vulnerabilities

Other CWE-787 (Out-of-bounds Write) vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2025-22457	Critical	9.0	100%	KEV + Ransom	Fix
CVE-2025-0282	Critical	9.0	100%	KEV + Ransom	-
CVE-2015-3113	Critical	9.8	100%	KEV	Fix
CVE-2021-20038	Critical	9.8	100%	KEV + Ransom	-
CVE-2023-4863	High	8.8	100%	KEV	Fix
CVE-2020-16040	Medium	6.5	100%	-	Fix

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2024-11-21.