How severe is CVE-2020-26921?

CVE-2020-26921 has a CVSS 3.x base score of 8.3, 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 low, integrity high, and availability high.

Is CVE-2020-26921 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (53rd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2020-26921?

CVE-2020-26921 primarily affects Netgear Gs110emx Firmware. In total, 4 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2020-26921?

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-2020-26921 published?

CVE-2020-26921 was published on 2020-10-09 and last updated on 2026-06-17.

CVE-2020-26921

CVE-2020-26921 is a high-severity vulnerability in Netgear Gs110emx Firmware with a CVSS 3.x base score of 8.3. 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 8.3)
CVSS v2: 5.8
EPSS exploit prediction: 1% (53rd percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-287
Affected product: Netgear Gs110emx Firmware
Published: 2020-10-09
Last modified: 2026-06-17

Description

Certain NETGEAR devices are affected by authentication bypass. This affects GS110EMX before 1.0.1.7, GS810EMX before 1.7.1.3, XS512EM before 1.0.1.3, and XS724EM before 1.0.1.3.

Frequently asked questions

What is CVE-2020-26921?: Certain NETGEAR devices are affected by authentication bypass. This affects GS110EMX before 1.0.1.7, GS810EMX before 1.7.1.3, XS512EM before 1.0.1.3, and XS724EM before 1.0.1.3.
How severe is CVE-2020-26921?: CVE-2020-26921 has a CVSS 3.x base score of 8.3, 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 low, integrity high, and availability high.
Is CVE-2020-26921 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (53rd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2020-26921?: CVE-2020-26921 primarily affects Netgear Gs110emx Firmware. In total, 4 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2020-26921?: 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-2020-26921 published?: CVE-2020-26921 was published on 2020-10-09 and last updated on 2026-06-17.

References

https://kb.netgear.com/000062332/Security-Advisory-for-Authentication-Bypass-on-Some-Smart-Managed-Plus-Switches-PSV-2020-0305

Affected products (4)

cpe:2.3:o:netgear:gs110emx_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:netgear:gs810emx_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:netgear:xs512em_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:netgear:xs724em_firmware:*:*:*:*:*:*:*:*

More vulnerabilities in Netgear Gs110emx Firmware

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Other CWE-287 (Improper Authentication) vulnerabilities

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CVE-2026-56162 — Critical (CVSS 10.0): Improper authentication in Azure SQL Database allows an unauthorized attacker to elevate privileges over a network.
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