2.5

CVE-2021-43566: samba

Modified
AliasesALPINE-CVE-2021-43566RHBA-2021:4438UBUNTU-CVE-2021-43566
Published 11-01-2022Last modified 04-08-2024

Vulnerability summary

CVE-2021-43566 is a low (CVSS 2.5) vulnerability in samba. EPSS estimates a 0.38% chance of exploitation in the next 30 days, higher than 31.6% of scored vulnerabilities. 1 public exploit is recorded.

Priority
Routine

Not severe (CVSS 2.5, local access); no exploitation reported by the 5 checked sources

Source freshness unavailable

How is this decided?
CVSS score
2.5/10
010
Low · v3.1 (NVD)
EPSS score
0.38%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedNot listed by any tracked catalog.
RansomwareNot flaggedNo ransomware use recorded.
Public exploits1reference

Advisory lineage

Upstream 0 · Downstream 4 · Related 4
OPENSUSE-SU-2022:0283-1SUSE-SU-2022:0283-1SUSE-SU-2022:0323-1USN-5260-1

Timeline

  1. 11-01-2022
    PublishedVulnerability first disclosed.
  2. 04-08-2024
    Last modifiedVulnerability information updated.

Description

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.

CVSS metrics

6 scores · 5 sources · 2 versions

EPSS trend

Probability

0.38%

Chance of exploitation in the next 30 days

Percentile

32%

Versus all other CVEs

30-day change

No change 0.00 pp

From 0.38% on 04-10-2026

04-10-202603-11-2026

Known exploited

Compare KEV catalogs
CISA KEV

Not in the CISA KEV catalog.

ENISA CNW

Not in the ENISA CNW catalog.

CIRCL

Not in the CIRCL catalog.

Public exploits

1 found
  • referenceUnverified

    Exploit Reference (bugzilla.samba.org)

    Maturity: unknown

Weaknesses

CWE · root cause

Affected systems

Version check

Known conditions: local access, low-privilege account, no user interaction (CVSS vector). Other conditions: not stated in public data.

Redhat45 products
  • ctdb< 0:4.14.5-2.el8
  • ctdb-debuginfo< 0:4.14.5-2.el8
  • libsmbclient< 0:4.14.5-2.el8
  • libsmbclient-debuginfo< 0:4.14.5-2.el8
  • libsmbclient-devel< 0:4.14.5-2.el8
Alpine1 product
  • samba< 4.13.17-r0
Debian1 product
  • samba< 2:4.16.0+dfsg-2
Samba1 product
Ubuntu1 product
  • sambaAll versions (No fix recorded) | < 2:4.13.17~dfsg-0ubuntu0.21.04.1

5 vendors · 49 products

References

25 links
Show all 25 references