How severe is CVE-2021-20637?

CVE-2021-20637 has a CVSS 3.x base score of 6.5, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is none, integrity none, and availability high.

Is CVE-2021-20637 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (58th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-20637?

CVE-2021-20637 affects Logitech Lan-w300n/pr5b Firmware. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-20637?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2021-20637 published?

CVE-2021-20637 was published on 2021-02-12 and last updated on 2026-06-17.

CVE-2021-20637

CVE-2021-20637 is a medium-severity vulnerability in Logitech Lan-w300n/pr5b Firmware with a CVSS 3.x base score of 6.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low.

Key facts

Severity: Medium (CVSS 3.x base score 6.5)
CVSS v2: 4.3
EPSS exploit prediction: 1% (58th percentile)
Actively exploited: Not listed in CISA KEV
Affected product: Logitech Lan-w300n/pr5b Firmware
Published: 2021-02-12
Last modified: 2026-06-17

Description

Improper check or handling of exceptional conditions in LOGITEC LAN-W300N/PR5B allows a remote attacker to cause a denial-of-service (DoS) condition by sending a specially crafted URL.

Frequently asked questions

What is CVE-2021-20637?: Improper check or handling of exceptional conditions in LOGITEC LAN-W300N/PR5B allows a remote attacker to cause a denial-of-service (DoS) condition by sending a specially crafted URL.
How severe is CVE-2021-20637?: CVE-2021-20637 has a CVSS 3.x base score of 6.5, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is none, integrity none, and availability high.
Is CVE-2021-20637 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (58th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-20637?: CVE-2021-20637 affects Logitech Lan-w300n/pr5b Firmware. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-20637?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2021-20637 published?: CVE-2021-20637 was published on 2021-02-12 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:o:logitech:lan-w300n\/pr5b_firmware:-:*:*:*:*:*:*:*

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