What is CVE-2021-3671?

CVE-2021-3671 is a medium-severity vulnerability in NetApp Management Services For Element Software, classified under NULL Pointer Dereference. CVSS score: 6.5/10. Published 2021-10-12.

How severe is CVE-2021-3671?

Medium severity. CVSS v3 base score is 6.5 out of 10.

Is CVE-2021-3671 known to be exploited?

2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

NULL pointer dereference in NetApp Management Services For Element Software

CVE-2021-3671

A null pointer de-reference was found in the way samba kerberos server handled missing sname in TGS-REQ (Ticket Granting Server - Request). An authenticated user could use this flaw to crash the samba server.

Published 2021-10-12 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H.

EPSS exploit prediction

EPSS: 0.021 (81.9th percentile), scored 2026-11-01.

Low probability of exploitation in the next 30 days, but still tracked. 82nd percentile — 81.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.022 · newest: 0.021 · change: -0.001

Affected products

NetApp Management Services For Element Software
NetApp Management Services For Hci
NetApp Ontap Select Deploy Administration Utility
Samba
Debian Linux — versions 10.0, 11.0
Samba — versions Fixed in samba 4.13.12, samba 4.14.8

Weakness classification (CWE)

CWE-476 — NULL Pointer Dereference

Public proof-of-concept exploits

References

bugzilla.redhat.com/show_bug.cgi
bugzilla.samba.org/show_bug.cgi
github.com/heimdal/heimdal/commit/04171147948d0a3636bc6374181926f0fb2ec83a (Patch, Third Party Advisory)
www.debian.org/security/2022/dsa-5287 (vendor-advisory, Third Party Advisory)
lists.debian.org/debian-lts-announce/2022/11/msg00034.html (mailing-list, Mailing List, Third Party Advisory)
security.netapp.com/advisory/ntap-20221215-0002/ (Third Party Advisory)
security.netapp.com/advisory/ntap-20230216-0008/ (Third Party Advisory)

Frequently asked questions

What is CVE-2021-3671?: CVE-2021-3671 is a medium-severity vulnerability in NetApp Management Services For Element Software, classified under NULL Pointer Dereference. CVSS score: 6.5/10. Published 2021-10-12.
How severe is CVE-2021-3671?: Medium severity. CVSS v3 base score is 6.5 out of 10.
Is CVE-2021-3671 known to be exploited?: 2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.