VDB-195833 · CVE-2021-4147 · Nessus 253270

libvirt libxl Driver locking

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.
3.5	$0-$5k	0.00

Summaryinfo

A vulnerability, which was classified as problematic, has been found in libvirt. Affected by this vulnerability is an unknown functionality of the component libxl Driver. The manipulation leads to locking. This vulnerability is listed as CVE-2021-4147. There is no available exploit.

Detailsinfo

A vulnerability, which was classified as problematic, has been found in libvirt (Virtualization Software) (affected version unknown). This issue affects an unknown functionality of the component libxl Driver. The manipulation with an unknown input leads to a locking vulnerability. Using CWE to declare the problem leads to CWE-667. The product does not properly acquire or release a lock on a resource, leading to unexpected resource state changes and behaviors. Impacted is availability.

The weakness was presented 03/26/2022. The advisory is shared at bugzilla.redhat.com. The identification of this vulnerability is CVE-2021-4147 since 12/21/2021. Neither technical details nor an exploit are publicly available.

The vulnerability scanner Nessus provides a plugin with the ID 253270 (Linux Distros Unpatched Vulnerability : CVE-2021-4147), which helps to determine the existence of the flaw in a target environment.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

The vulnerability is also documented in the vulnerability database at Tenable (253270). Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Productinfo

Type

Virtualization Software

Name

libvirt

License

open-source

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 3.5
VulDB Meta Temp Score: 3.5

VulDB Base Score: 3.5
VulDB Temp Score: 3.5
VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv2info

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

Vector	Complexity	Authentication	Confidentiality	Integrity	Availability
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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

Exploitinginfo

Class: Locking
CWE: CWE-667
CAPEC: 🔍
ATT&CK: 🔍

Physical: No
Local: No
Remote: Partially

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: 253270
Nessus Name: Linux Distros Unpatched Vulnerability : CVE-2021-4147

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: no mitigation known
Status: 🔍

0-Day Time: 🔍

Timelineinfo

12/21/2021 🔍
03/26/2022 +95 days 🔍
03/26/2022 +0 days 🔍
08/24/2025 +1247 days 🔍

Sourcesinfo

Advisory: bugzilla.redhat.com
Status: Confirmed

CVE: CVE-2021-4147 (🔍)
GCVE (CVE): GCVE-0-2021-4147
GCVE (VulDB): GCVE-100-195833

Entryinfo

Created: 03/26/2022 12:46
Updated: 08/24/2025 06:39
Changes: 03/26/2022 12:46 (36), 03/27/2022 15:21 (1), 08/24/2025 06:39 (16)
Complete: 🔍
Cache ID: 216::103

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.