How severe is CVE-2021-20643?

CVE-2021-20643 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity high, and availability none.

Is CVE-2021-20643 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (63rd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-20643?

CVE-2021-20643 affects Elecom Ld-ps/u1 Firmware. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-20643?

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-2021-20643 published?

CVE-2021-20643 was published on 2021-02-12 and last updated on 2026-06-17.

CVE-2021-20643

CVE-2021-20643 is a high-severity vulnerability in Elecom Ld-ps/u1 Firmware with a CVSS 3.x base score of 7.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low.

Key facts

Severity: High (CVSS 3.x base score 7.5)
CVSS v2: 5.0
EPSS exploit prediction: 1% (63rd percentile)
Actively exploited: Not listed in CISA KEV
Affected product: Elecom Ld-ps/u1 Firmware
Published: 2021-02-12
Last modified: 2026-06-17

Description

Improper access control vulnerability in ELECOM LD-PS/U1 allows remote attackers to change the administrative password of the affected device by processing a specially crafted request.

Frequently asked questions

What is CVE-2021-20643?: Improper access control vulnerability in ELECOM LD-PS/U1 allows remote attackers to change the administrative password of the affected device by processing a specially crafted request.
How severe is CVE-2021-20643?: CVE-2021-20643 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity high, and availability none.
Is CVE-2021-20643 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (63rd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-20643?: CVE-2021-20643 affects Elecom Ld-ps/u1 Firmware. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-20643?: 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-2021-20643 published?: CVE-2021-20643 was published on 2021-02-12 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:o:elecom:ld-ps\/u1_firmware:-:*:*:*:*:*:*:*