CVE-2021-38575

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

1.99% probability of exploitation activity in the next 30 days.

EPSS percentile

Equal to or higher than the score of 80.3% of scored records. A rank, not a probability.

NVD base score

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

NVD CVSS vector

CVSS:3.1/AV:N/AC:H/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

Important. Red Hat's rating for its own products, not a CVSS rating.

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

2021-12-01 00:00Z4 YR AGO

Last updated

2025-11-03 19:26Z12 MO AGO

Reserved

2021-08-11

Assigning CNA

TianoCore

Record state

PUBLISHED

Severity

Not rated by the issuing CNA

CNA CVSS vector

Not published by the issuing CNA

Weaknesses

• CWE-124Buffer Underwrite ('Buffer Underflow')Base
• CWE-119Improper Restriction of Operations within the Bounds of a Memory BufferClass

Data version

5.2

Document digest

51b152a1d1c0d5d37d35046c5619a0beae25293eea5bcc6e24bf77bd261b315c

• bugzilla.tianocore.orghttps://bugzilla.tianocore.org/show_bug.cgi?id=3356
• www.insyde.comhttps://www.insyde.com/security-pledge/SA-2023025
• lists.debian.orghttps://lists.debian.org/debian-lts-announce/2025/06/msg00007.html