How severe is CVE-2021-20640?

CVE-2021-20640 has a CVSS 3.x base score of 6.8, rated medium severity. It is exploitable over an adjacent network with low attack complexity, requires high privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2021-20640 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (42nd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-20640?

CVE-2021-20640 affects Logitech Lan-w300n/pgrb Firmware. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-20640?

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

When was CVE-2021-20640 published?

CVE-2021-20640 was published on 2021-02-12 and last updated on 2026-06-17.

CVE-2021-20640

CVE-2021-20640 is a medium-severity vulnerability in Logitech Lan-w300n/pgrb Firmware with a CVSS 3.x base score of 6.8. 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-120.

Key facts

Severity: Medium (CVSS 3.x base score 6.8)
CVSS v2: 7.7
EPSS exploit prediction: 1% (42nd percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-120
Affected product: Logitech Lan-w300n/pgrb Firmware
Published: 2021-02-12
Last modified: 2026-06-17

Description

Buffer overflow vulnerability in LOGITEC LAN-W300N/PGRB allows an attacker with administrative privilege to execute an arbitrary OS command via unspecified vectors.

Frequently asked questions

What is CVE-2021-20640?: Buffer overflow vulnerability in LOGITEC LAN-W300N/PGRB allows an attacker with administrative privilege to execute an arbitrary OS command via unspecified vectors.
How severe is CVE-2021-20640?: CVE-2021-20640 has a CVSS 3.x base score of 6.8, rated medium severity. It is exploitable over an adjacent network with low attack complexity, requires high privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2021-20640 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (42nd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-20640?: CVE-2021-20640 affects Logitech Lan-w300n/pgrb Firmware. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-20640?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2021-20640 published?: CVE-2021-20640 was published on 2021-02-12 and last updated on 2026-06-17.

References

Affected products (1)

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

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