BusyBox up to 1.33.2 awk Applet hash_init use after free

CVSS Meta Temp Score
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CTI Interest Score
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5.8$0-$5k0.00

Summaryinfo

A vulnerability was found in BusyBox. It has been classified as problematic. This impacts the function hash_init of the component awk Applet. Performing a manipulation results in use after free. This vulnerability was named CVE-2021-42381. The attack may be initiated remotely. There is no available exploit. Upgrading the affected component is recommended.

Detailsinfo

A vulnerability classified as problematic has been found in BusyBox. This affects the function hash_init of the component awk Applet. The manipulation with an unknown input leads to a use after free vulnerability. CWE is classifying the issue as CWE-416. Referencing memory after it has been freed can cause a program to crash, use unexpected values, or execute code. This is going to have an impact on confidentiality, integrity, and availability.

The weakness was presented 11/17/2021. It is possible to read the advisory at jfrog.com. This vulnerability is uniquely identified as CVE-2021-42381 since 10/14/2021. Technical details of the vulnerability 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). Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

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-2021-42381 (🔍)
GCVE (CVE): GCVE-0-2021-42381
GCVE (VulDB): GCVE-100-186723

Entryinfo

Created: 11/17/2021 16:58
Updated: 04/24/2025 02:25
Changes: 11/17/2021 16:58 (54), 11/19/2021 11:54 (1), 11/19/2021 12:02 (1), 01/19/2025 15:57 (17), 04/24/2025 02:25 (1)
Complete: 🔍
Cache ID: 216::103

Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

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