BusyBox up to 1.33.2 awk Applet clrvar use after free

CVSS Meta Temp Score
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Current Exploit Price (≈)
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CTI Interest Score
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5.8$0-$5k0.00

Summaryinfo

A vulnerability was found in BusyBox and classified as problematic. This affects the function clrvar of the component awk Applet. Such manipulation leads to use after free. This vulnerability is uniquely identified as CVE-2021-42380. The attack can be launched remotely. No exploit exists. It is suggested to upgrade the affected component.

Detailsinfo

A vulnerability was found in BusyBox. It has been rated as problematic. Affected by this issue is the function clrvar of the component awk Applet. The manipulation with an unknown input leads to a use after free vulnerability. Using CWE to declare the problem leads to CWE-416. Referencing memory after it has been freed can cause a program to crash, use unexpected values, or execute code. Impacted is confidentiality, integrity, and availability.

The weakness was disclosed 11/17/2021. The advisory is available at jfrog.com. This vulnerability is handled as CVE-2021-42380 since 10/14/2021. Technical details are known, but there is no available exploit.

The vulnerability scanner Nessus provides a plugin with the ID 214387 (Debian dla-4019 : busybox - security update), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 1.34.0 eliminates this vulnerability.

The vulnerability is also documented in the vulnerability database at Tenable (214387). If you want to get best quality of vulnerability data, you may have to visit VulDB.

Productinfo

Name

Version

License

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 5.9
VulDB Meta Temp Score: 5.8

VulDB Base Score: 4.7
VulDB Temp Score: 4.5
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 7.2
NVD Vector: 🔍

CVSSv2info

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

NVD Base Score: 🔍

Exploitinginfo

Class: Use after free
CWE: CWE-416 / CWE-119
CAPEC: 🔍
ATT&CK: 🔍

Physical: No
Local: No
Remote: Yes

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Nessus ID: 214387
Nessus Name: Debian dla-4019 : busybox - security update

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔍

Upgrade: BusyBox 1.34.0

Timelineinfo

10/14/2021 🔍
11/17/2021 +34 days 🔍
11/17/2021 +0 days 🔍
04/24/2025 +1254 days 🔍

Sourcesinfo

Advisory: jfrog.com
Status: Confirmed

CVE: CVE-2021-42380 (🔍)
GCVE (CVE): GCVE-0-2021-42380
GCVE (VulDB): GCVE-100-186722

Entryinfo

Created: 11/17/2021 16:57
Updated: 04/24/2025 02:25
Changes: 11/17/2021 16:57 (54), 11/19/2021 11:39 (1), 11/19/2021 11:47 (1), 01/19/2025 15:57 (17), 04/24/2025 02:25 (1)
Complete: 🔍
Cache ID: 216::103

If you want to get best quality of vulnerability data, you may have to visit VulDB.

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