CVE-2021-43400

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

1.66% probability of exploitation activity in the next 30 days.

EPSS percentile

Equal to or higher than the score of 76.2% of scored records. A rank, not a probability.

NVD base score

9.1 (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:H/I:H/A:N

NVD analysis status

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

Red Hat severity

Moderate. 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

2021-11-04 00:00Z4 YR AGO

Last updated

2025-11-04 16:09Z11 MO AGO

Reserved

2021-11-04

Assigning CNA

mitre

Record state

PUBLISHED

Severity

Not rated by the issuing CNA

CNA CVSS vector

Not published by the issuing CNA

Weaknesses

• CWE-416Use After FreeVariant

Data version

5.2

Document digest

2b87ed25584c1282febb6d3217ed1b126750daab18390d79c17113d10d03b9b7

• git.kernel.orghttps://git.kernel.org/pub/scm/bluetooth/bluez.git/commit/?id=838c0dc7641e1c991c0f3027bf94bee4606012f8
• lists.debian.org[debian-lts-announce] 20221024 [SECURITY] [DLA 3157-1] bluez security updatehttps://lists.debian.org/debian-lts-announce/2022/10/msg00026.htmlmailing-list
• lists.debian.orghttps://lists.debian.org/debian-lts-announce/2024/09/msg00022.html