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Vulnerability details: VCID-2sru-639a-aaad
Vulnerability ID VCID-2sru-639a-aaad
Aliases CVE-2021-43566
Summary 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.
Status Published
Exploitability 0.5
Weighted Severity 2.3
Risk 1.1
Affected and Fixed Packages Package Details
Weaknesses (1)
CWE-362 Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')
System Score Found at
cvssv3 2.6 https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2021-43566.json
epss 0.00113 https://api.first.org/data/v1/epss?cve=CVE-2021-43566
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epss 0.00113 https://api.first.org/data/v1/epss?cve=CVE-2021-43566
epss 0.00113 https://api.first.org/data/v1/epss?cve=CVE-2021-43566
epss 0.00113 https://api.first.org/data/v1/epss?cve=CVE-2021-43566
epss 0.00113 https://api.first.org/data/v1/epss?cve=CVE-2021-43566
epss 0.00113 https://api.first.org/data/v1/epss?cve=CVE-2021-43566
epss 0.00113 https://api.first.org/data/v1/epss?cve=CVE-2021-43566
epss 0.00113 https://api.first.org/data/v1/epss?cve=CVE-2021-43566
epss 0.00113 https://api.first.org/data/v1/epss?cve=CVE-2021-43566
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epss 0.00113 https://api.first.org/data/v1/epss?cve=CVE-2021-43566
epss 0.0014 https://api.first.org/data/v1/epss?cve=CVE-2021-43566
epss 0.0014 https://api.first.org/data/v1/epss?cve=CVE-2021-43566
epss 0.00146 https://api.first.org/data/v1/epss?cve=CVE-2021-43566
epss 0.00165 https://api.first.org/data/v1/epss?cve=CVE-2021-43566
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epss 0.00165 https://api.first.org/data/v1/epss?cve=CVE-2021-43566
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epss 0.00175 https://api.first.org/data/v1/epss?cve=CVE-2021-43566
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epss 0.00175 https://api.first.org/data/v1/epss?cve=CVE-2021-43566
epss 0.00175 https://api.first.org/data/v1/epss?cve=CVE-2021-43566
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epss 0.00175 https://api.first.org/data/v1/epss?cve=CVE-2021-43566
epss 0.00175 https://api.first.org/data/v1/epss?cve=CVE-2021-43566
epss 0.00175 https://api.first.org/data/v1/epss?cve=CVE-2021-43566
epss 0.00175 https://api.first.org/data/v1/epss?cve=CVE-2021-43566
epss 0.00224 https://api.first.org/data/v1/epss?cve=CVE-2021-43566
epss 0.00224 https://api.first.org/data/v1/epss?cve=CVE-2021-43566
epss 0.00224 https://api.first.org/data/v1/epss?cve=CVE-2021-43566
cvssv3.1 4.2 https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml
cvssv2 1.2 https://nvd.nist.gov/vuln/detail/CVE-2021-43566
cvssv3 2.5 https://nvd.nist.gov/vuln/detail/CVE-2021-43566
cvssv3.1 2.5 https://nvd.nist.gov/vuln/detail/CVE-2021-43566
Reference id Reference type URL
https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2021-43566.json
https://api.first.org/data/v1/epss?cve=CVE-2021-43566
https://bugzilla.samba.org/show_bug.cgi?id=13979
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-43566
https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml
https://security.netapp.com/advisory/ntap-20220110-0001/
https://www.samba.org/samba/security/CVE-2021-43566.html
1004691 https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1004691
cpe:2.3:a:samba:samba:*:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:a:samba:samba:*:*:*:*:*:*:*:*
CVE-2021-43566 https://nvd.nist.gov/vuln/detail/CVE-2021-43566
RHBA-2021:4438 https://bugzilla.redhat.com/show_bug.cgi?id=2009676
USN-5260-1 https://usn.ubuntu.com/5260-1/
No exploits are available.
Vector: CVSS:3.1/AV:A/AC:H/PR:L/UI:N/S:U/C:L/I:N/A:N Found at https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2021-43566.json
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:N Found at https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: AV:L/AC:H/Au:N/C:N/I:P/A:N Found at https://nvd.nist.gov/vuln/detail/CVE-2021-43566
Exploitability (E) Access Vector (AV) Access Complexity (AC) Authentication (Au) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

high

functional

unproven

proof_of_concept

not_defined

local

adjacent_network

network

high

medium

low

multiple

single

none

none

partial

complete

none

partial

complete

none

partial

complete
Vector: CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:L/A:N Found at https://nvd.nist.gov/vuln/detail/CVE-2021-43566
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:L/A:N Found at https://nvd.nist.gov/vuln/detail/CVE-2021-43566
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Exploit Prediction Scoring System (EPSS)
Percentile 0.45791
EPSS Score 0.00113
Published At Nov. 1, 2024, midnight
Date Actor Action Source VulnerableCode Version
There are no relevant records.