Vulnerability in Samba
CVE-2021-43566
All versions of Samba prior to 4.13.16 are vulnerable to a malicious client using an SMB1 or NFS race to allow a directory to be created in an area of the server file system not exported under the share definition. Note that SMB1 has to be enabled, or the share also available via NFS in order for this attack to succeed.
Vulnerability class: Race Condition
Published · last modified .
CVSS v3 metric
CVSS v3 base score 2.5 (Low). Vector: CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:L/A:N.
EPSS exploit prediction
EPSS: 0.004 (29.0th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 29th percentile — 29.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.004 · newest: 0.004 · change: 0.000
Affected products
Weakness classification (CWE)
References
- bugzilla.samba.org/show_bug.cgi (Exploit, Issue Tracking, Vendor Advisory)
- security.netapp.com/advisory/ntap-20220110-0001/ (Third Party Advisory)
- www.samba.org/samba/security/CVE-2021-43566.html (Patch, Vendor Advisory)
Frequently asked questions
- What is CVE-2021-43566?
- CVE-2021-43566 is a low-severity vulnerability in Samba, classified under Concurrent Execution using Shared Resource with Improper Synchronization (Race Condition). CVSS score: 2.5/10. Published 2022-01-11.
- How severe is CVE-2021-43566?
- Low severity. CVSS v3 base score is 2.5 out of 10.