CVE-2021-3671
MEDIUMCVSS 6.5/10EPSS 2.02%
Last modified
CVE-2021-3671 is a medium-severity vulnerability rated 6.5/10 on the CVSS scale. 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.. EPSS estimates a 2.02% chance of exploitation in the next 30 days.
Description
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.
Metrics
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Samba | Samba | < 4.13.12 |
| Samba | Samba | >= 4.14.0, < 4.14.8 |
| Debian | Debian Linux | 10.0 |
| Debian | Debian Linux | 11.0 |
| Netapp | Management Services For Element Software | All versions |
| Netapp | Management Services For Netapp Hci | All versions |
| Netapp | Ontap Select Deploy Administration Utility | All versions |
References
- https://github.com/heimdal/heimdal/commit/04171147948d0a3636bc6374181926f0fb2ec83aPatch, Third Party Advisory
- https://lists.debian.org/debian-lts-announce/2022/11/msg00034.htmlMailing List, Third Party Advisory
- https://security.netapp.com/advisory/ntap-20221215-0002/Third Party Advisory
- https://security.netapp.com/advisory/ntap-20230216-0008/Third Party Advisory
- https://www.debian.org/security/2022/dsa-5287Third Party Advisory
- https://github.com/heimdal/heimdal/commit/04171147948d0a3636bc6374181926f0fb2ec83aPatch, Third Party Advisory
- https://lists.debian.org/debian-lts-announce/2022/11/msg00034.htmlMailing List, Third Party Advisory
- https://security.netapp.com/advisory/ntap-20221215-0002/Third Party Advisory
- https://security.netapp.com/advisory/ntap-20230216-0008/Third Party Advisory
- https://www.debian.org/security/2022/dsa-5287Third Party Advisory
Timeline
- Published
- Last Modified
- Status
- Modified
Frequently Asked Questions
What is 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.
How severe is CVE-2021-3671?
CVE-2021-3671 has a CVSS score of 6.5/10 (MEDIUM severity). The EPSS model estimates a 2.02% probability of exploitation in the next 30 days.
How do I fix CVE-2021-3671?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.
How Strix Helps
- How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
- Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
- PR ReviewsPentest every pull request so vulnerable code is caught before it ships to production.
- AI Penetration TestingHow AI-driven penetration testing continuously covers your attack surface.
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Are you affected by CVE-2021-3671?
Run a free Strix scan to check your systems for this vulnerability.
Scan your code nowSource: NVD / NIST