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Common Weakness Enumeration

CWE-416

Allowed

Use After Free

Abstraction: Variant · Status: Stable

API response cwe.mitre.org

The product reuses or references memory after it has been freed. At some point afterward, the memory may be allocated again and saved in another pointer, while the original pointer references a location somewhere within the new allocation. Any operations using the original pointer are no longer valid because the memory "belongs" to the code that operates on the new pointer.

10902 vulnerabilities reference this CWE, most recent first.

CVE-2021-42706 (GCVE-0-2021-42706)

Vulnerability from cvelistv5 – Published: 2021-11-15 14:00 – Updated: 2024-09-16 20:57
VLAI
Title
AzeoTech DAQFactory
Summary
This vulnerability could allow an attacker to disclose information and execute arbitrary code on affected installations of WebAccess/MHI Designer
Severity
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
CWE
Assigner
References
Impacted products
Vendor Product Version
Advantech HMI Designer Affected: All versions , ≤ 2.1.11.0 (custom)
Create a notification for this product.
Date Public
2021-11-09 00:00
Show details on NVD website
To clipboard 

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CVE-2021-42386 (GCVE-0-2021-42386)

Vulnerability from cvelistv5 – Published: 2021-11-15 00:00 – Updated: 2025-11-03 20:34
VLAI
Summary
A use-after-free in Busybox's awk applet leads to denial of service and possibly code execution when processing a crafted awk pattern in the nvalloc function
Severity
7.2 (High)
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
SSVC
Exploitation: none Automatable: no Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2025-04-23 13:31 UTC
CWE
Assigner
References
Impacted products
Vendor Product Version
busybox busybox Affected: unspecified , < 1.34.0 (custom)
Create a notification for this product.
Show details on NVD website
To clipboard 

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CVE-2021-42385 (GCVE-0-2021-42385)

Vulnerability from cvelistv5 – Published: 2021-11-15 00:00 – Updated: 2025-11-03 20:34
VLAI
Summary
A use-after-free in Busybox's awk applet leads to denial of service and possibly code execution when processing a crafted awk pattern in the evaluate function
Severity
7.2 (High)
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
SSVC
Exploitation: none Automatable: no Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2025-04-23 13:32 UTC
CWE
Assigner
References
Impacted products
Vendor Product Version
busybox busybox Affected: unspecified , < 1.34.0 (custom)
Create a notification for this product.
Show details on NVD website
To clipboard 

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CVE-2021-42384 (GCVE-0-2021-42384)

Vulnerability from cvelistv5 – Published: 2021-11-15 00:00 – Updated: 2025-11-03 20:34
VLAI
Summary
A use-after-free in Busybox's awk applet leads to denial of service and possibly code execution when processing a crafted awk pattern in the handle_special function
Severity
7.2 (High)
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
SSVC
Exploitation: none Automatable: no Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2025-04-23 13:32 UTC
CWE
Assigner
References
Impacted products
Vendor Product Version
busybox busybox Affected: unspecified , < 1.34.0 (custom)
Create a notification for this product.
Show details on NVD website
To clipboard 

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CVE-2021-42383 (GCVE-0-2021-42383)

Vulnerability from cvelistv5 – Published: 2021-11-15 00:00 – Updated: 2025-04-23 19:23
VLAI
Summary
A use-after-free in Busybox's awk applet leads to denial of service and possibly code execution when processing a crafted awk pattern in the evaluate function
Severity
7.2 (High)
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
SSVC
Exploitation: none Automatable: no Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2025-04-23 13:32 UTC
CWE
Assigner
References
Impacted products
Vendor Product Version
busybox busybox Affected: unspecified , < 1.34.0 (custom)
Create a notification for this product.
Show details on NVD website
To clipboard 

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CVE-2021-42382 (GCVE-0-2021-42382)

Vulnerability from cvelistv5 – Published: 2021-11-15 00:00 – Updated: 2025-11-03 20:34
VLAI
Summary
A use-after-free in Busybox's awk applet leads to denial of service and possibly code execution when processing a crafted awk pattern in the getvar_s function
Severity
7.2 (High)
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
SSVC
Exploitation: none Automatable: no Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2025-04-23 13:32 UTC
CWE
Assigner
References
Impacted products
Vendor Product Version
busybox busybox Affected: unspecified , < 1.34.0 (custom)
Create a notification for this product.
Show details on NVD website
To clipboard 

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CVE-2021-42381 (GCVE-0-2021-42381)

Vulnerability from cvelistv5 – Published: 2021-11-15 00:00 – Updated: 2025-11-03 20:34
VLAI
Summary
A use-after-free in Busybox's awk applet leads to denial of service and possibly code execution when processing a crafted awk pattern in the hash_init function
Severity
7.2 (High)
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
SSVC
Exploitation: none Automatable: no Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2025-04-23 13:32 UTC
CWE
Assigner
References
Impacted products
Vendor Product Version
busybox busybox Affected: unspecified , < 1.34.0 (custom)
Create a notification for this product.
Show details on NVD website
To clipboard 

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CVE-2021-42380 (GCVE-0-2021-42380)

Vulnerability from cvelistv5 – Published: 2021-11-15 00:00 – Updated: 2025-11-03 20:34
VLAI
Summary
A use-after-free in Busybox's awk applet leads to denial of service and possibly code execution when processing a crafted awk pattern in the clrvar function
Severity
7.2 (High)
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
SSVC
Exploitation: none Automatable: no Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2025-04-23 13:32 UTC
CWE
Assigner
References
Impacted products
Vendor Product Version
busybox busybox Affected: unspecified , < 1.34.0 (custom)
Create a notification for this product.
Show details on NVD website
To clipboard 

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CVE-2021-42379 (GCVE-0-2021-42379)

Vulnerability from cvelistv5 – Published: 2021-11-15 00:00 – Updated: 2025-11-03 20:34
VLAI
Summary
A use-after-free in Busybox's awk applet leads to denial of service and possibly code execution when processing a crafted awk pattern in the next_input_file function
Severity
7.2 (High)
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
SSVC
Exploitation: none Automatable: no Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2025-04-23 13:32 UTC
CWE
Assigner
References
Impacted products
Vendor Product Version
busybox busybox Affected: unspecified , < 1.34.0 (custom)
Create a notification for this product.
Show details on NVD website
To clipboard 

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CVE-2021-42378 (GCVE-0-2021-42378)

Vulnerability from cvelistv5 – Published: 2021-11-15 00:00 – Updated: 2025-11-03 20:34
VLAI
Summary
A use-after-free in Busybox's awk applet leads to denial of service and possibly code execution when processing a crafted awk pattern in the getvar_i function
Severity
7.2 (High)
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
SSVC
Exploitation: none Automatable: no Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2025-04-23 13:32 UTC
CWE
Assigner
References
Impacted products
Vendor Product Version
busybox busybox Affected: unspecified , < 1.34.0 (custom)
Create a notification for this product.
Show details on NVD website
To clipboard 

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Mitigation
Architecture and Design

Strategy: Language Selection

Choose a language that provides automatic memory management.

Mitigation
Implementation

Strategy: Attack Surface Reduction

When freeing pointers, be sure to set them to NULL once they are freed. However, the utilization of multiple or complex data structures may lower the usefulness of this strategy.

No CAPEC attack patterns related to this CWE.

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