Common Weakness Enumeration

CWE-476

Allowed

NULL Pointer Dereference

Abstraction: Base · Status: Stable

API response cwe.mitre.org

The product dereferences a pointer that it expects to be valid but is NULL.

6359 vulnerabilities reference this CWE, most recent first.

CVE-2019-14878 (GCVE-0-2019-14878)

Vulnerability from cvelistv5 – Published: 2020-03-19 15:04 – Updated: 2024-08-05 00:26
VLAI
Summary
In the __d2b function of the newlib libc library, all versions prior to 3.3.0 (see newlib/libc/stdlib/mprec.c), Balloc is used to allocate a big integer, however no check is performed to verify if the allocation succeeded or not. Accessing _x will trigger a null pointer dereference bug in case of a memory allocation failure.
Severity
6.5 (Medium)
CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
CWE
Assigner
References
Impacted products
Vendor Product Version
Red Hat newlib Affected: all newlib versions prior to 3.3.0
Create a notification for this product.
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CVE-2019-14877 (GCVE-0-2019-14877)

Vulnerability from cvelistv5 – Published: 2020-03-19 15:04 – Updated: 2024-08-05 00:26
VLAI
Summary
In the __mdiff function of the newlib libc library, all versions prior to 3.3.0 (see newlib/libc/stdlib/mprec.c), Balloc is used to allocate big integers, however no check is performed to verify if the allocation succeeded or not. The access to _wds and _sign will trigger a null pointer dereference bug in case of a memory allocation failure.
Severity
6.5 (Medium)
CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
CWE
Assigner
References
Impacted products
Vendor Product Version
Red Hat newlib Affected: all newlib versions prior to 3.3.0
Create a notification for this product.
Show details on NVD website
To clipboard 

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CVE-2019-14876 (GCVE-0-2019-14876)

Vulnerability from cvelistv5 – Published: 2020-03-19 15:08 – Updated: 2024-08-05 00:26
VLAI
Summary
In the __lshift function of the newlib libc library, all versions prior to 3.3.0 (see newlib/libc/stdlib/mprec.c), Balloc is used to allocate a big integer, however no check is performed to verify if the allocation succeeded or not. The access to b1 will trigger a null pointer dereference bug in case of a memory allocation failure.
Severity
6.5 (Medium)
CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
CWE
Assigner
References
Impacted products
Vendor Product Version
Red Hat newlib Affected: all newlib versions prior to 3.3.0
Create a notification for this product.
Show details on NVD website
To clipboard 

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CVE-2019-14875 (GCVE-0-2019-14875)

Vulnerability from cvelistv5 – Published: 2020-03-19 15:08 – Updated: 2024-08-05 00:26
VLAI
Summary
In the __multiply function of the newlib libc library, all versions prior to 3.3.0 (see newlib/libc/stdlib/mprec.c), Balloc is used to allocate a big integer, however no check is performed to verify if the allocation succeeded or not. The access of _x[0] will trigger a null pointer dereference bug in case of a memory allocation failure.
Severity
6.5 (Medium)
CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
CWE
Assigner
References
Impacted products
Vendor Product Version
Red Hat newlib Affected: all newlib versions prior to 3.3.0
Create a notification for this product.
Show details on NVD website
To clipboard 

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CVE-2019-14874 (GCVE-0-2019-14874)

Vulnerability from cvelistv5 – Published: 2020-03-19 15:07 – Updated: 2024-08-05 00:26
VLAI
Summary
In the __i2b function of the newlib libc library, all versions prior to 3.3.0 (see newlib/libc/stdlib/mprec.c), Balloc is used to allocate a big integer, however no check is performed to verify if the allocation succeeded or not. The access of _ x[0] will trigger a null pointer dereference bug in case of a memory allocation failure.
Severity
6.5 (Medium)
CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
CWE
Assigner
References
Impacted products
Vendor Product Version
Red Hat newlib Affected: all newlib versions prior to 3.3.0
Create a notification for this product.
Show details on NVD website
To clipboard 

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CVE-2019-14873 (GCVE-0-2019-14873)

Vulnerability from cvelistv5 – Published: 2020-03-19 15:04 – Updated: 2024-08-05 00:26
VLAI
Summary
In the __multadd function of the newlib libc library, prior to versions 3.3.0 (see newlib/libc/stdlib/mprec.c), Balloc is used to allocate a big integer, however no check is performed to verify if the allocation succeeded or not. This will trigger a null pointer dereference bug in case of a memory allocation failure.
Severity
6.5 (Medium)
CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
CWE
Assigner
References
Impacted products
Vendor Product Version
Red Hat newlib Affected: all newlib versions prior to 3.3.0
Create a notification for this product.
Show details on NVD website
To clipboard 

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CVE-2019-14872 (GCVE-0-2019-14872)

Vulnerability from cvelistv5 – Published: 2020-03-19 12:35 – Updated: 2024-08-05 00:26
VLAI
Summary
The _dtoa_r function of the newlib libc library, prior to version 3.3.0, performs multiple memory allocations without checking their return value. This could result in NULL pointer dereference.
Severity
6.5 (Medium)
CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
CWE
Assigner
References
Impacted products
Vendor Product Version
Red Hat newlib Affected: all newlib versions prior to 3.3.0
Create a notification for this product.
Show details on NVD website
To clipboard 

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CVE-2019-14871 (GCVE-0-2019-14871)

Vulnerability from cvelistv5 – Published: 2020-03-18 15:43 – Updated: 2024-08-05 00:26
VLAI
Summary
The REENT_CHECK macro (see newlib/libc/include/sys/reent.h) as used by REENT_CHECK_TM, REENT_CHECK_MISC, REENT_CHECK_MP and other newlib macros in versions prior to 3.3.0, does not check for memory allocation problems when the DEBUG flag is unset (as is the case in production firmware builds).
Severity
6.5 (Medium)
CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
CWE
Assigner
References
Impacted products
Vendor Product Version
Red Hat newlib Affected: all newlib versions prior to 3.3.0
Create a notification for this product.
Show details on NVD website
To clipboard 

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CVE-2019-14847 (GCVE-0-2019-14847)

Vulnerability from cvelistv5 – Published: 2019-11-06 00:00 – Updated: 2024-08-05 00:26
VLAI
Summary
A flaw was found in samba 4.0.0 before samba 4.9.15 and samba 4.10.x before 4.10.10. An attacker can crash AD DC LDAP server via dirsync resulting in denial of service. Privilege escalation is not possible with this issue.
Severity
4.9 (Medium)
CVSS:3.0/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H
CWE
Assigner
References
Impacted products
Vendor Product Version
Samba samba Affected: samba 4.0.0 before samba 4.9.15, samba 4.10.x before 4.10.10
Create a notification for this product.
Show details on NVD website
To clipboard 

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CVE-2019-13542 (GCVE-0-2019-13542)

Vulnerability from cvelistv5 – Published: 2019-09-17 18:56 – Updated: 2024-08-04 23:57
VLAI
Summary
3S-Smart Software Solutions GmbH CODESYS V3 OPC UA Server, all versions 3.5.11.0 to 3.5.15.0, allows an attacker to send crafted requests from a trusted OPC UA client that cause a NULL pointer dereference, which may trigger a denial-of-service condition.
Severity
No CVSS data available.
CWE
  • CWE-476 - NULL POINTER DEREFERENCE CWE-476
Assigner
References
Impacted products
Vendor Product Version
GmbH 3S-Smart Software Solutions GmbH CODESYS V3 OPC UA Server Affected: all versions 3.5.11.0 to 3.5.15.0
Create a notification for this product.
Show details on NVD website
To clipboard 

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Mitigation MIT-56
Implementation

For any pointers that could have been modified or provided from a function that can return NULL, check the pointer for NULL before use. When working with a multithreaded or otherwise asynchronous environment, ensure that proper locking APIs are used to lock before the check, and unlock when it has finished [REF-1484].

Mitigation
Requirements

Select a programming language that is not susceptible to these issues.

Mitigation
Implementation

Check the results of all functions that return a value and verify that the value is non-null before acting upon it.

Mitigation
Architecture and Design

Identify all variables and data stores that receive information from external sources, and apply input validation to make sure that they are only initialized to expected values.

Mitigation
Implementation

Explicitly initialize all variables and other data stores, either during declaration or just before the first usage.

No CAPEC attack patterns related to this CWE.

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