CVE-2021-20986

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

1.00% probability of exploitation activity in the next 30 days.

EPSS percentile

Ranks above 60.4% of scored records. A rank, not a probability.

NVD base score

7.5 (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:N/I:N/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

2021-02-16 16:35Z5 YR AGO

Last updated

2024-09-16 23:46Z1 YR AGO

Reserved

2020-12-17

Assigning CNA

CERTVDE

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-787Out-of-bounds WriteBase

Data version

5.1

Document digest

31b34700c6f98f43cc2efea7a27236a11cd0aca56b508a64b918f7804aaab432

• kb.hilscher.comhttps://kb.hilscher.com/display/ISMS/2020-12-03+Denial+of+Service+vulnerability+in+PROFINET+IO+Devicex_refsource_CONFIRM
• cert.vde.comhttps://cert.vde.com/en-us/advisories/vde-2021-006x_refsource_CONFIRM