Vulnerability in Samba
CVE-2021-20316
A flaw was found in the way Samba handled file/directory metadata. This flaw allows an authenticated attacker with permissions to read or modify share metadata, to perform this operation outside of the share.
Vulnerability class: Race Condition
EPSS: 0.008 (51.3th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 6.8 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:N.
Affected products
- Samba
- Debian Debian_linux — versions 10.0, 11.0
- Redhat Enterprise_linux — versions 8.0
- Redhat Enterprise_linux_aus — versions 8.6
- Redhat Enterprise_linux_eus — versions 8.6
- Redhat Enterprise_linux_tus — versions 8.6
- Redhat Virtualization_host — versions 4.0
- N/a Samba — versions Affects samba file server before v4.15.0, Fixed in samba v4.15.0
Weakness classification (CWE)
Public proof-of-concept exploits
References
- secalert@redhat.com (Issue Tracking, Vendor Advisory)
- secalert@redhat.com (Vendor Advisory)
- secalert@redhat.com (Third Party Advisory, Issue Tracking)
- secalert@redhat.com (Third Party Advisory)
- secalert@redhat.com (Third Party Advisory, Mitigation)
- secalert@redhat.com (vendor-advisory)
Frequently asked questions
- What is CVE-2021-20316?
- CVE-2021-20316 is a medium-severity vulnerability in Samba, classified under Concurrent Execution using Shared Resource with Improper Synchronization (Race Condition). CVSS score: 6.8/10. Published 2022-08-23.
- How severe is CVE-2021-20316?
- Medium severity. CVSS v3 base score is 6.8 out of 10.
- Is CVE-2021-20316 known to be exploited?
- 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.