How severe is CVE-2018-21125?

CVE-2018-21125 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-2018-21125 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (50th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2018-21125?

CVE-2018-21125 affects Netgear Wac510 Firmware. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2018-21125?

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-2018-21125 published?

CVE-2018-21125 was published on 2020-04-22 and last updated on 2026-06-17.

CVE-2018-21125

CVE-2018-21125 is a high-severity vulnerability in Netgear Wac510 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. The underlying weakness is classified as CWE-287.

Key facts

Severity: High (CVSS 3.x base score 8.8)
CVSS v2: 5.8
EPSS exploit prediction: 1% (50th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-287
Affected product: Netgear Wac510 Firmware
Published: 2020-04-22
Last modified: 2026-06-17

Description

NETGEAR WAC510 devices before 5.0.0.17 are affected by authentication bypass.

Frequently asked questions

What is CVE-2018-21125?: NETGEAR WAC510 devices before 5.0.0.17 are affected by authentication bypass.
How severe is CVE-2018-21125?: CVE-2018-21125 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-2018-21125 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (50th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2018-21125?: CVE-2018-21125 affects Netgear Wac510 Firmware. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2018-21125?: 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-2018-21125 published?: CVE-2018-21125 was published on 2020-04-22 and last updated on 2026-06-17.

References

https://kb.netgear.com/000060233/Security-Advisory-for-an-Authentication-Bypass-on-WAC510-PSV-2018-0261

Affected products (1)

cpe:2.3:o:netgear:wac510_firmware:*:*:*:*:*:*:*:*

More vulnerabilities in Netgear Wac510 Firmware

CVE-2018-21097 — Critical (CVSS 9.8): Certain NETGEAR devices are affected by a stack-based buffer overflow by an unauthenticated attacker. This affects…
CVE-2018-21133 — Critical (CVSS 9.8): Certain NETGEAR devices are affected by a stack-based buffer overflow by an unauthenticated attacker. This affects…
CVE-2018-21132 — Critical (CVSS 9.8): Certain NETGEAR devices are affected by authentication bypass. This affects WAC505 before 5.0.0.17 and WAC510 before…
CVE-2018-21131 — Critical (CVSS 9.1): Certain NETGEAR devices are affected by unauthenticated firmware downgrade. This affects WAC505 before 5.0.0.17 and…
CVE-2018-21130 — High (CVSS 8.8): Certain NETGEAR devices are affected by command injection by an unauthenticated attacker. This affects WAC505 before…
CVE-2018-21128 — High (CVSS 8.8): Certain NETGEAR devices are affected by authentication bypass. This affects WAC505 before 5.0.0.17 and WAC510 before…

All CVEs affecting Netgear Wac510 Firmware →

Other CWE-287 (Improper Authentication) vulnerabilities

CVE-2026-20317 — Critical (CVSS 10.0): As part of Cisco's ongoing commitment to proactive security and product quality, the Cisco Secure Workload engineering…
CVE-2026-19977 — Critical (CVSS 10.0): A vulnerability was detected in EFM ipTIME A3004T 14.19.0. The affected element is the function…
CVE-2026-59500 — Critical (CVSS 10.0): CWE-287: Improper Authentication
CVE-2024-27253 — Critical (CVSS 10.0): IBM DOORS Next 7.0.3 through 7.0.3 Interim Fix 018 could allow an authenticated user to bypass security logic to…
CVE-2026-56162 — Critical (CVSS 10.0): Improper authentication in Azure SQL Database allows an unauthorized attacker to elevate privileges over a network.
CVE-2026-62825 — Critical (CVSS 10.0): Improper authentication in Azure Key Vault allows an unauthorized attacker to elevate privileges over a network.

Browse all CWE-287 (Improper Authentication) vulnerabilities →