CVE-2021-42781

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

2.87% probability of exploitation activity in the next 30 days.

EPSS percentile

Equal to or higher than the score of 86.7% of scored records. A rank, not a probability.

NVD base score

5.3 (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:L

NVD analysis status

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

Red Hat severity

Low. 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

2022-04-18 00:00Z4 YR AGO

Last updated

2025-11-03 21:45Z12 MO AGO

Reserved

2021-10-21

Assigning CNA

redhat

Record state

PUBLISHED

Severity

Not rated by the issuing CNA

CNA CVSS vector

Not published by the issuing CNA

Weaknesses

• CWE-119Improper Restriction of Operations within the Bounds of a Memory BufferClass
• CWE-787Out-of-bounds WriteBase

Data version

5.2

Document digest

5db1566c0015fbdb4fb2508af627c0cdac3714392173601914ef2c508f9f2988

• bugzilla.redhat.comhttps://bugzilla.redhat.com/show_bug.cgi?id=2016439
• github.comhttps://github.com/OpenSC/OpenSC/commit/17d8980c
• github.comhttps://github.com/OpenSC/OpenSC/commit/40c50a3a
• github.comhttps://github.com/OpenSC/OpenSC/commit/05648b06
• github.comhttps://github.com/OpenSC/OpenSC/commit/5d4daf6c
• github.comhttps://github.com/OpenSC/OpenSC/commit/cae5c71f
• security.gentoo.orgGLSA-202209-03https://security.gentoo.org/glsa/202209-03vendor-advisory
• lists.debian.org[debian-lts-announce] 20230621 [SECURITY] [DLA 3463-1] opensc security updatehttps://lists.debian.org/debian-lts-announce/2023/06/msg00025.htmlmailing-list
• lists.debian.orghttps://lists.debian.org/debian-lts-announce/2024/12/msg00026.html