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NVD / CVE Program· CNA redhat

CVE-2021-44141: All versions of Samba prior to 4.15.5 are vulnerable to a malicious client using a server symlink to determine if a file or directory exists…

MediumCVSS 4.3 · v3.1—No exploit Fix available

Noroxi assessment

Priority: Monitor (action score 17/100)

  • The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
  • Probability of exploitation in the next 30 days: 1% (FIRST EPSS); higher than 65.7% of all records.
  • Anyone who can reach it over the internet can trigger it. A low-privileged account is enough. No user action is required. No special conditions are required; it is repeatable.
  • Fixed version: Azure Linux 3.0 ARM 4.18.3-1; Azure Linux 3.0 x64 4.18.3-1.
  • Mentioned 1 time in Turkish national cyber security advisories (siberguvenlik.gov.tr).

Low priority for now. Upgrade to Azure Linux 3.0 ARM 4.18.3-1; Azure Linux 3.0 x64 4.18.3-1 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

All versions of Samba prior to 4.15.5 are vulnerable to a malicious client using a server symlink to determine if a file or directory exists in an area of the server file system not exported under the share definition. SMB1 with unix extensions has to be enabled in order for this attack to succeed.

Published
Feb 21, 2022
Updated
Jun 17, 2026
EPSS
1.0% · 65th percentile

Report tools

JSON

Action score

17

Monitor

Low priority for now.

CVSS
17 / 40 · 4.3 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 1.0%

Get told when this record changes

  • Not in KEV: no record of exploitation in the wild
  • No public exploit code on record
  • A fix has been released

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

VendorProduct
sambasamba
redhatstorage
fedoraprojectfedora

Versions reported by the vendor

Affected version ranges reported by the assigning authority (redhat). Independent of NVD's CPE analysis and usually ahead of it.

  • n/a Samba

    • All versions of Samba prior to 4.15.5affected
Affected versions · NVD (4)

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • fedoraproject fedora34
  • fedoraproject fedora35
  • redhat storage3.0
  • samba sambabefore 4.15.5

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
AlmaLinux:8ctdbbefore 4.15.5-5.el84.15.5-5.el8
AlmaLinux:8libsmbclientbefore 4.15.5-5.el84.15.5-5.el8
AlmaLinux:8libsmbclient-develbefore 4.15.5-5.el84.15.5-5.el8
AlmaLinux:8libwbclientbefore 4.15.5-5.el84.15.5-5.el8
AlmaLinux:8libwbclient-develbefore 4.15.5-8.el8_64.15.5-8.el8_6
AlmaLinux:8libwbclient-develbefore 4.15.5-5.el84.15.5-5.el8
AlmaLinux:8python3-sambabefore 4.15.5-5.el84.15.5-5.el8
AlmaLinux:8python3-samba-testbefore 4.15.5-5.el84.15.5-5.el8
AlmaLinux:8sambabefore 4.15.5-5.el84.15.5-5.el8
AlmaLinux:8samba-clientbefore 4.15.5-5.el84.15.5-5.el8
AlmaLinux:8samba-client-libsbefore 4.15.5-5.el84.15.5-5.el8
AlmaLinux:8samba-commonbefore 4.15.5-5.el84.15.5-5.el8
AlmaLinux:8samba-common-libsbefore 4.15.5-5.el84.15.5-5.el8
AlmaLinux:8samba-common-toolsbefore 4.15.5-5.el84.15.5-5.el8
AlmaLinux:8samba-develbefore 4.15.5-5.el84.15.5-5.el8
AlmaLinux:8samba-krb5-printingbefore 4.15.5-5.el84.15.5-5.el8
AlmaLinux:8samba-libsbefore 4.15.5-5.el84.15.5-5.el8
AlmaLinux:8samba-pidlbefore 4.15.5-5.el84.15.5-5.el8
AlmaLinux:8samba-testbefore 4.15.5-5.el84.15.5-5.el8
AlmaLinux:8samba-test-libsbefore 4.15.5-5.el84.15.5-5.el8
AlmaLinux:8samba-vfs-iouringbefore 4.15.5-5.el84.15.5-5.el8
AlmaLinux:8samba-winbindbefore 4.15.5-5.el84.15.5-5.el8
AlmaLinux:8samba-winbind-clientsbefore 4.15.5-5.el84.15.5-5.el8
AlmaLinux:8samba-winbind-krb5-locatorbefore 4.15.5-5.el84.15.5-5.el8

+96

Same product

samba: all records

Other highest-scoring records for the same primary product.

  • CVE-2017-7494Samba since version 3.5.0 and before 4.6.4, 4.5.10 and 4.4.14 is vulnerable to remote code execution vulnerability, allowing a malicious…KEV
    99Now
  • CVE-2015-0240The Netlogon server implementation in smbd in Samba 3.5.x and 3.6.x before 3.6.25, 4.0.x before 4.0.25, 4.1.x before 4.1.17, and 4.2.x…
    66This week
  • CVE-2003-0085Buffer overflow in the SMB/CIFS packet fragment re-assembly code for SMB daemon (smbd) in Samba before 2.2.8, and Samba-TNG before 0.3.1…
    66This week

Published before and after this one in the same product

  • ← EarlierCVE-2020-25722Feb 18, 2022 · Multiple flaws were found in the way samba AD DC implemented access and conformance checking of stored data.
    35Monitor
  • ← EarlierCVE-2021-44142Feb 21, 2022 · The Samba vfs_fruit module uses extended file attributes (EA, xattr) to provide "...enhanced compatibility with Apple SMB clients and…
    57Plan
  • Later →CVE-2021-23192Mar 2, 2022 · A flaw was found in the way samba implemented DCE/RPC.
    31Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
Azure Linux 3.0 ARM4.18.3-1 · sambaMicrosoft (MSRC)
Azure Linux 3.0 x644.18.3-1 · sambaMicrosoft (MSRC)
almalinux:ctdb4.15.5-5.el8 · AlmaLinux:8Package registry (OSV)
almalinux:libsmbclient4.15.5-5.el8 · AlmaLinux:8Package registry (OSV)
almalinux:libsmbclient-devel4.15.5-5.el8 · AlmaLinux:8Package registry (OSV)
almalinux:libwbclient4.15.5-5.el8 · AlmaLinux:8Package registry (OSV)
almalinux:libwbclient-devel4.15.5-8.el8_6 · AlmaLinux:8Package registry (OSV)
almalinux:python3-samba4.15.5-5.el8 · AlmaLinux:8Package registry (OSV)
almalinux:python3-samba-test4.15.5-5.el8 · AlmaLinux:8Package registry (OSV)
almalinux:samba4.15.5-5.el8 · AlmaLinux:8Package registry (OSV)
almalinux:samba-client4.15.5-5.el8 · AlmaLinux:8Package registry (OSV)
almalinux:samba-client-libs4.15.5-5.el8 · AlmaLinux:8Package registry (OSV)
almalinux:samba-common4.15.5-5.el8 · AlmaLinux:8Package registry (OSV)
almalinux:samba-common-libs4.15.5-5.el8 · AlmaLinux:8Package registry (OSV)
alpine:samba4.15.5-r0 · Alpine:v3.15Package registry (OSV)
debian:samba2:4.16.0+dfsg-2 · Debian:12Package registry (OSV)
opensuse:apparmor2.13.6-150300.3.11.2 · openSUSE:Leap 15.3Package registry (OSV)
opensuse:krb51.19.2-150300.8.3.2 · openSUSE:Leap 15.3Package registry (OSV)
opensuse:krb5-mini1.19.2-150300.8.3.2 · openSUSE:Leap 15.3Package registry (OSV)
opensuse:ldb2.4.1-150300.3.10.1 · openSUSE:Leap 15.3Package registry (OSV)
opensuse:libapparmor2.13.6-150300.3.11.1 · openSUSE:Leap 15.3Package registry (OSV)
opensuse:samba4.15.4+git.324.8332acf1a63-150300.3.25.3 · openSUSE:Leap 15.3Package registry (OSV)
opensuse:sssd1.16.1-150300.23.17.3 · openSUSE:Leap 15.3Package registry (OSV)
opensuse:talloc2.3.3-150300.3.3.2 · openSUSE:Leap 15.3Package registry (OSV)
opensuse:talloc-man2.3.3-150300.3.3.1 · openSUSE:Leap 15.3Package registry (OSV)
opensuse:tdb1.4.4-150300.3.3.2 · openSUSE:Leap 15.3Package registry (OSV)
opensuse:tevent0.11.0-150300.3.3.2 · openSUSE:Leap 15.3Package registry (OSV)
opensuse:tevent-man0.11.0-150300.3.3.1 · openSUSE:Leap 15.3Package registry (OSV)
red hat:ctdb0:4.15.5-100.el8rhgs · Red Hat:storage:3.5:samba:el8Package registry (OSV)
red hat:ctdb-debuginfo0:4.15.5-100.el8rhgs · Red Hat:storage:3.5:samba:el8Package registry (OSV)

+23

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

National notice (Türkiye Cybersecurity Directorate / USOM)

Official security notices citing this record; remediation advice is on the agency's page.

All national notices →

Not on record for this CVE: EPSS history · patch commit or PR link · researcher credit · variant or chain candidate · public bounty program.

Technical details

Attack conditions

  • Anyone who can reach it over the internet can trigger it.
  • A low-privileged account is enough.
  • No user action is required.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
low · data can be read
Integrity
none
Availability
none
Attack vector
Network
Attack complexity
Low
Privileges required
Low
User interaction
None
Scope
Unchanged
Confidentiality impact
Low
Integrity impact
None
Availability impact
None

Weakness class (CWE)

CWE-200 · Exposure of Sensitive Information to an Unauthorized Actor

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N

nvd-primary

Root cause

The extension requests broader permissions than its function needs and sends the data it collects out for purposes beyond its stated function.

The bug in code

The whole CWE-200 class

A representative example of this vulnerability class. Not the vendor's source code; it shows the faulty pattern and its fix.

Vulnerable

json
{  "permissions": ["tabs", "<all_urls>"],  "background": { "service_worker": "analytics.js" }}

Fixed

json
{  "permissions": ["activeTab"],  "host_permissions": ["https://yildiz.example/*"]}

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

References

Show all references (1 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records