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.

6310 vulnerabilities reference this CWE, most recent first.

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
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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
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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
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CVE-2019-12654 (GCVE-0-2019-12654)

Vulnerability from cvelistv5 – Published: 2019-09-25 20:16 – Updated: 2024-11-19 18:55
VLAI
Title
Cisco IOS and IOS XE Software Session Initiation Protocol Denial of Service Vulnerability
Summary
A vulnerability in the common Session Initiation Protocol (SIP) library of Cisco IOS and IOS XE Software could allow an unauthenticated, remote attacker to trigger a reload of an affected device, resulting in a denial of service (DoS) condition. The vulnerability is due to insufficient sanity checks on an internal data structure. An attacker could exploit this vulnerability by sending a sequence of malicious SIP messages to an affected device. An exploit could allow the attacker to cause a NULL pointer dereference, resulting in a crash of the iosd process. This triggers a reload of the device.
Severity
8.6 (High)
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H
SSVC
Exploitation: none Automatable: yes Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
Assigner
References
URL Tags
https://tools.cisco.com/security/center/content/C… vendor-advisoryx_refsource_CISCO
Impacted products
Vendor Product Version
Cisco Cisco IOS 15.0(1)XA2 Affected: unspecified , < n/a (custom)
Create a notification for this product.
Date Public
2019-09-25 00:00
Show details on NVD website
To clipboard 

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CVE-2019-12647 (GCVE-0-2019-12647)

Vulnerability from cvelistv5 – Published: 2019-09-25 20:05 – Updated: 2024-11-19 18:56
VLAI
Title
Cisco IOS and IOS XE Software IP Ident Denial of Service Vulnerability
Summary
A vulnerability in the Ident protocol handler of Cisco IOS and IOS XE Software could allow an unauthenticated, remote attacker to cause an affected device to reload. The vulnerability exists because the affected software incorrectly handles memory structures, leading to a NULL pointer dereference. An attacker could exploit this vulnerability by opening a TCP connection to specific ports and sending traffic over that connection. A successful exploit could allow the attacker to cause the affected device to reload, resulting in a denial of service (DoS) condition.
Severity
8.6 (High)
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H
SSVC
Exploitation: none Automatable: yes Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
Assigner
References
URL Tags
https://tools.cisco.com/security/center/content/C… vendor-advisoryx_refsource_CISCO
Impacted products
Vendor Product Version
Cisco Cisco IOS Affected: unspecified , < 12.1(12) (custom)
Create a notification for this product.
Date Public
2019-09-25 00:00
Show details on NVD website
To clipboard 

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CVE-2019-10207 (GCVE-0-2019-10207)

Vulnerability from cvelistv5 – Published: 2019-11-25 13:51 – Updated: 2024-08-04 22:17
VLAI
Summary
A flaw was found in the Linux kernel's Bluetooth implementation of UART, all versions kernel 3.x.x before 4.18.0 and kernel 5.x.x. An attacker with local access and write permissions to the Bluetooth hardware could use this flaw to issue a specially crafted ioctl function call and cause the system to crash.
Severity
4.7 (Medium)
CVSS:3.0/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H
CWE
Assigner
References
Impacted products
Vendor Product Version
Red Hat kernel Affected: all versions kernel 3.x.x before 4.18.0 and kernel 5.x.x
Create a notification for this product.
Show details on NVD website
To clipboard 

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CVE-2019-10140 (GCVE-0-2019-10140)

Vulnerability from cvelistv5 – Published: 2019-08-15 16:50 – Updated: 2024-08-04 22:10
VLAI
Summary
A vulnerability was found in Linux kernel's, versions up to 3.10, implementation of overlayfs. An attacker with local access can create a denial of service situation via NULL pointer dereference in ovl_posix_acl_create function in fs/overlayfs/dir.c. This can allow attackers with ability to create directories on overlayfs to crash the kernel creating a denial of service (DOS).
Severity
5.5 (Medium)
CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
CWE
Assigner
References
Impacted products
Vendor Product Version
OpenSource kernel: Affected: up to kernel-3.10
Create a notification for this product.
Show details on NVD website
To clipboard 

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CVE-2019-5055 (GCVE-0-2019-5055)

Vulnerability from cvelistv5 – Published: 2019-09-11 21:10 – Updated: 2024-08-04 19:47
VLAI
Summary
An exploitable denial-of-service vulnerability exists in the Host Access Point Daemon (hostapd) on the NETGEAR N300 (WNR2000v5 with Firmware Version V1.0.0.70) wireless router. A SOAP request sent in an invalid sequence to the <WFAWLANConfig:1#PutMessage> service can cause a null pointer dereference, resulting in the hostapd service crashing. An unauthenticated attacker can send a specially-crafted SOAP request to trigger this vulnerability.
Severity
7.5 (High)
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CWE
  • CWE-476 - NULL Pointer Dereference
Assigner
References
Impacted products
Vendor Product Version
Netgear N300 WNR2000v5 Affected: Firmware Version V1.0.0.70
Create a notification for this product.
Show details on NVD website
To clipboard 

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CVE-2019-5054 (GCVE-0-2019-5054)

Vulnerability from cvelistv5 – Published: 2019-09-11 21:09 – Updated: 2024-08-04 19:47
VLAI
Summary
An exploitable denial-of-service vulnerability exists in the session handling functionality of the NETGEAR N300 (WNR2000v5 with Firmware Version V1.0.0.70) HTTP server. An HTTP request with an empty User-Agent string sent to a page requiring authentication can cause a null pointer dereference, resulting in the HTTP service crashing. An unauthenticated attacker can send a specially crafted HTTP request to trigger this vulnerability.
Severity
7.5 (High)
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CWE
  • CWE-476 - NULL Pointer Dereference
Assigner
References
Impacted products
Vendor Product Version
Netgear N300 WNR2000v5 Affected: Firmware Version V1.0.0.70
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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