CVE-2021-28216

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

0.42% probability of exploitation activity in the next 30 days.

EPSS percentile

Equal to or higher than the score of 36.3% of scored records. A rank, not a probability.

NVD base score

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

NVD CVSS vector

CVSS:3.1/AV:L/AC:L/PR:L/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

2021-08-05 20:44Z5 YR AGO

Last updated

2025-11-03 19:25Z11 MO AGO

Reserved

2021-03-12

Assigning CNA

TianoCore

Record state

PUBLISHED

Severity

Not rated by the issuing CNA

CNA CVSS vector

Not published by the issuing CNA

Weaknesses

• CWE-587Assignment of a Fixed Address to a PointerVariant
• CWE-763Release of Invalid Pointer or ReferenceBase

Data version

5.2

Document digest

7113a3deb986d3b9face63838772d1601666dec3dfcc8e839e936c31b0429fe9

• bugzilla.tianocore.orghttps://bugzilla.tianocore.org/show_bug.cgi?id=2957x_refsource_MISC
• lists.debian.orghttps://lists.debian.org/debian-lts-announce/2025/06/msg00007.html