CVE-2021-3671

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

2.18% probability of exploitation activity in the next 30 days.

EPSS percentile

Ranks above 80.7% of scored records. A rank, not a probability.

NVD base score

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

NVD CVSS vector

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

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

2021-10-12 00:00Z4 YR AGO

Last updated

2024-08-03 17:01Z2 YR AGO

Reserved

2021-07-30

Assigning CNA

redhat

Record state

PUBLISHED

Severity

Not rated by the issuing CNA

CNA CVSS vector

Not published by the issuing CNA

Weaknesses

• CWE-476NULL Pointer DereferenceBase

Data version

5.1

Document digest

e15ee32768a3f26a4cfad13376fc09b7b4ae08b165bcfb7420e0232f01d4071d

• bugzilla.redhat.comhttps://bugzilla.redhat.com/show_bug.cgi?id=2013080%2C
• bugzilla.samba.orghttps://bugzilla.samba.org/show_bug.cgi?id=14770%2C
• github.comhttps://github.com/heimdal/heimdal/commit/04171147948d0a3636bc6374181926f0fb2ec83a
• www.debian.orgDSA-5287https://www.debian.org/security/2022/dsa-5287vendor-advisory
• lists.debian.org[debian-lts-announce] 20221126 [SECURITY] [DLA 3206-1] heimdal security updatehttps://lists.debian.org/debian-lts-announce/2022/11/msg00034.htmlmailing-list
• security.netapp.comhttps://security.netapp.com/advisory/ntap-20221215-0002/
• security.netapp.comhttps://security.netapp.com/advisory/ntap-20230216-0008/