Common Weakness Enumeration

CWE-476

Allowed

NULL Pointer Dereference

Abstraction: Base · Status: Stable

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

1661 vulnerabilities reference this CWE, most recent first.

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.
SSVC
Exploitation: none Automatable: yes Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2024-11-19 17:22 UTC
CWE
Assigner
cisco CNA
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

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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.
SSVC
Exploitation: none Automatable: yes Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2024-11-19 17:23 UTC
CWE
Assigner
cisco CNA
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

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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.
CWE
Assigner
redhat CNA
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

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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).
CWE
Assigner
redhat CNA
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

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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.
CWE
  • CWE-476 - NULL Pointer Dereference
Assigner
talos CNA
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

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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.
CWE
  • CWE-476 - NULL Pointer Dereference
Assigner
talos CNA
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

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CVE-2019-5010 (GCVE-0-2019-5010)

Vulnerability from cvelistv5 – Published: 2019-10-31 20:05 – Updated: 2026-10-07 18:55
VLAI
Summary
An exploitable denial-of-service vulnerability exists in the X509 certificate parser of Python.org Python 2.7.11 / 3.6.6. A specially crafted X509 certificate can cause a NULL pointer dereference, resulting in a denial of service. An attacker can initiate or accept TLS connections using crafted certificates to trigger this vulnerability.
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-10-07 18:55 UTC
CWE
  • CWE-476 - NULL Pointer Dereference
Assigner
talos CNA
References
Impacted products
Vendor Product Version
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Show details on NVD website

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CVE-2019-3995 (GCVE-0-2019-3995)

Vulnerability from cvelistv5 – Published: 2019-12-17 21:59 – Updated: 2024-08-04 19:26
VLAI
Summary
ELOG 3.1.4-57bea22 and below is affected by a denial of service vulnerability due to a NULL pointer dereference. A remote unauthenticated attacker can crash the ELOG server by sending a crafted HTTP GET request.
Severity
No CVSS data available.
CWE
  • CWE-476 - NULL Pointer Dereference
Assigner
tenable CNA
References
Impacted products
Vendor Product Version
n/a ELOG Affected: ELOG 3.1.4-57bea22 and below
Show details on NVD website

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CVE-2019-3840 (GCVE-0-2019-3840)

Vulnerability from cvelistv5 – Published: 2019-03-27 12:24 – Updated: 2024-08-04 19:19
VLAI
Summary
A NULL pointer dereference flaw was discovered in libvirt before version 5.0.0 in the way it gets interface information through the QEMU agent. An attacker in a guest VM can use this flaw to crash libvirtd and cause a denial of service.
CWE
Assigner
redhat CNA
Impacted products
Show details on NVD website

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CVE-2019-1922 (GCVE-0-2019-1922)

Vulnerability from cvelistv5 – Published: 2019-07-06 01:25 – Updated: 2024-11-21 19:19
VLAI
Title
Cisco IP Phone 7800 and 8800 Series Session Initiation Protocol Denial of Service Vulnerability
Summary
A vulnerability in Cisco SIP IP Phone Software for Cisco IP Phone 7800 Series and 8800 Series could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition on an affected phone. The vulnerability is due to insufficient validation of input Session Initiation Protocol (SIP) packets. An attacker could exploit this vulnerability by altering the SIP replies that are sent to the affected phone during the registration process. A successful exploit could allow the attacker to cause the phone to reboot and not complete the registration process.
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2024-11-21 18:57 UTC
CWE
Assigner
cisco CNA
References
URL Tags
https://tools.cisco.com/security/center/content/C… vendor-advisoryx_refsource_CISCO
Impacted products
Vendor Product Version
Cisco Cisco IP Phone 8800 Series Software Affected: unspecified , < 12.0(1)MN130 (custom)
Create a notification for this product.
Date Public
2019-07-03 00:00
Show details on NVD website

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      },
      "title": "Cisco IP Phone 7800 and 8800 Series Session Initiation Protocol Denial of Service Vulnerability",
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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.