CVE-2021-20587

Exploitation

Not assessed. CISA has not published an exploitation assessment for this record, and it is not in the KEV catalog. That is an absence of assessment, not a finding of no risk.

SSVC decision

Not assessed by CISA

EPSS probability

3.89% probability of exploitation activity in the next 30 days.

EPSS percentile

Ranks above 89.3% of scored records. A rank, not a probability.

NVD base score

9.8 (CVSS v3.x), scored by the NVD independently of the CNA.

NVD CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

NVD analysis status

Modified. NVD last modified this record on 2026-06-17.

Red Hat severity

No Red Hat rating. Red Hat rates the CVEs that affect its products.

Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.

Published

2021-02-19 19:55Z5 YR AGO

Last updated

2025-06-12 23:11Z1 YR AGO

Reserved

2020-12-17

Assigning CNA

Mitsubishi

Record state

PUBLISHED

Severity

High (CVSS 7.5)

CNA CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Weaknesses

• CWE-122Heap-based Buffer OverflowVariant
• CWE-787Out-of-bounds WriteBase

Data version

5.1

Document digest

62c15c17dd0b4aaaaa86e5fa12df6119402ac69d8fb61e1f6091bcbcdae40260

• www.mitsubishielectric.comhttps://www.mitsubishielectric.com/psirt/vulnerability/pdf/2020-021_en.pdfvendor-advisory
• jvn.jphttps://jvn.jp/vu/JVNVU92330101government-resource
• www.cisa.govhttps://www.cisa.gov/news-events/ics-advisories/icsa-21-049-02government-resource
• www.mitsubishielectric.comhttps://www.mitsubishielectric.com/en/psirt/vulnerability/pdf/2020-021_en.pdfvendor-advisory
• jvn.jphttps://jvn.jp/vu/JVNVU92330101/index.htmlgovernment-resource
• us-cert.cisa.govhttps://us-cert.cisa.gov/ics/advisories/icsa-21-049-02government-resource