VDB-190016 · CVE-2021-43566 · Nessus 261345

Samba up to 4.13.15 SMB1/NFS access control

CVSS Meta Temp Score CVSS is a standardized scoring system to determine possibilities of attacks. The Temp Score considers temporal factors like disclosure, exploit and countermeasures. The unique Meta Score calculates the average score of different sources to provide a normalized scoring system.	Current Exploit Price (≈) Our analysts are monitoring exploit markets and are in contact with vulnerability brokers. The range indicates the observed or calculated exploit price to be seen on exploit markets. A good indicator to understand the monetary effort required for and the popularity of an attack.	CTI Interest Score Our Cyber Threat Intelligence team is monitoring different web sites, mailing lists, exploit markets and social media networks. The CTI Interest Score identifies the interest of attackers and the security community for this specific vulnerability in real-time. A high score indicates an elevated risk to be targeted for this vulnerability.
4.8	$0-$5k	0.00

Summaryinfo

A vulnerability categorized as critical has been discovered in Samba up to 4.13.15. This affects an unknown part of the component SMB1/NFS. Such manipulation leads to access control. This vulnerability is documented as CVE-2021-43566. The attack can be executed remotely. There is not any exploit available. It is advisable to upgrade the affected component.

Detailsinfo

A vulnerability was found in Samba up to 4.13.15 (File Transfer Software). It has been rated as critical. Affected by this issue is an unknown functionality of the component SMB1/NFS. The manipulation with an unknown input leads to a access control vulnerability. Using CWE to declare the problem leads to CWE-284. The product does not restrict or incorrectly restricts access to a resource from an unauthorized actor. Impacted is confidentiality, integrity, and availability.

The weakness was released 01/11/2022. The advisory is shared for download at bugzilla.samba.org. This vulnerability is handled as CVE-2021-43566 since 11/09/2021. There are neither technical details nor an exploit publicly available. The MITRE ATT&CK project declares the attack technique as T1068.

The vulnerability scanner Nessus provides a plugin with the ID 261345 (Amazon Linux 2 : samba, --advisory ALAS2-2025-2979 (ALAS-2025-2979)), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 4.13.16 eliminates this vulnerability.

The vulnerability is also documented in the databases at Tenable (261345) and CERT Bund (WID-SEC-2023-2979). VulDB is the best source for vulnerability data and more expert information about this specific topic.

Affected

Amazon Linux 2
HPE NonStop Server
Ubuntu Linux
SUSE Linux
Oracle Linux
Open Source Samba

Productinfo

Type

File Transfer Software

Name

Samba

Version

License

open-source

Website

Product: https://www.samba.org/

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 5.0
VulDB Meta Temp Score: 4.8

VulDB Base Score: 5.0
VulDB Temp Score: 4.8
VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv2info

AV	AC	Au	C	I	A
💳	💳	💳	💳	💳	💳
💳	💳	💳	💳	💳	💳
💳	💳	💳	💳	💳	💳

Vector	Complexity	Authentication	Confidentiality	Integrity	Availability
Unlock	Unlock	Unlock	Unlock	Unlock	Unlock
Unlock	Unlock	Unlock	Unlock	Unlock	Unlock
Unlock	Unlock	Unlock	Unlock	Unlock	Unlock

VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

Exploitinginfo

Class: Access control
CWE: CWE-284 / CWE-266
CAPEC: 🔍
ATT&CK: 🔍

Physical: No
Local: No
Remote: Yes

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

0-Day	Unlock	Unlock	Unlock	Unlock
Today	Unlock	Unlock	Unlock	Unlock

Nessus ID: 261345
Nessus Name: Amazon Linux 2 : samba, --advisory ALAS2-2025-2979 (ALAS-2025-2979)

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔍

Upgrade: Samba 4.13.16

Timelineinfo

11/09/2021 🔍
01/11/2022 +63 days 🔍
01/11/2022 +0 days 🔍
09/08/2025 +1336 days 🔍

Sourcesinfo

Product: samba.org

Advisory: bugzilla.samba.org
Status: Confirmed
Confirmation: 🔍

CVE: CVE-2021-43566 (🔍)
GCVE (CVE): GCVE-0-2021-43566
GCVE (VulDB): GCVE-100-190016
CERT Bund: WID-SEC-2023-2979 - Samba: Schwachstelle ermöglicht Umgehen von Sicherheitsvorkehrungen

Entryinfo

Created: 01/11/2022 18:46
Updated: 09/08/2025 19:08
Changes: 01/11/2022 18:46 (40), 01/13/2022 14:35 (1), 09/07/2025 03:38 (21), 09/08/2025 19:08 (2)
Complete: 🔍
Cache ID: 216::103

VulDB is the best source for vulnerability data and more expert information about this specific topic.