CVE-2021-31871

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

1.87% probability of exploitation activity in the next 30 days.

EPSS percentile

Equal to or higher than the score of 79.0% 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

2021-04-30 05:18Z5 YR AGO

Last updated

2024-08-03 23:10Z2 YR AGO

Reserved

2021-04-29

Assigning CNA

mitre

Record state

PUBLISHED

Severity

Not rated by the issuing CNA

CNA CVSS vector

Not published by the issuing CNA

Weaknesses

• CWE-190Integer Overflow or WraparoundBase

Data version

5.1

Document digest

246a9a11bc100eb30f2d3f17e61db2de3bb0347e1653e14af45b0a3ad4bde2e8

• kernel.orghttps://kernel.org/pub/linux/libs/klibc/2.0/x_refsource_MISC
• lists.zytor.comhttps://lists.zytor.com/archives/klibc/2021-April/004593.htmlx_refsource_MISC
• git.kernel.orghttps://git.kernel.org/pub/scm/libs/klibc/klibc.git/commit/?id=2e48a12ab1e30d43498c2d53e878a11a1b5102d5x_refsource_MISC
• www.openwall.com[oss-security] 20210430 [ANNOUNCE] klibc 2.0.9http://www.openwall.com/lists/oss-security/2021/04/30/1mailing-listx_refsource_MLIST
• lists.debian.org[debian-lts-announce] 20210628 [SECURITY] [DLA 2695-1] klibc security updatehttps://lists.debian.org/debian-lts-announce/2021/06/msg00025.htmlmailing-listx_refsource_MLIST