Weakness (CWE)
CWE-476: NULL Pointer Dereference
The product dereferences a pointer that it expects to be valid but is NULL.
How to prevent it (5 mitigations)
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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].
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Requirements
Select a programming language that is not susceptible to these issues.
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Implementation
Check the results of all functions that return a value and verify that the value is non-null before acting upon it.
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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.
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Implementation
Explicitly initialize all variables and other data stores, either during declaration or just before the first usage.
Source: MITRE CWE-476
2,664 results · Feed
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High 7.1
Starting daemon with --cdi-disabled flag can lead to panic on specific builds
If BuildKit daemon is started with --cdi-disabled it can lead to daemon panic when builds try to use CDI devices. This can happen maliciously or by accident.
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High 8.7
Apache Thrift: c_glib multiplexed processor crashes on a message it cannot route
NULL Pointer Dereference, Use of Uninitialized Variable vulnerability in Apache Thrift c_glib bindings. This issue affects Apache Thrift: before 0.25.0. Users are recommended to upgrade to version 0.25.0, which fixes the issue.
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High 8.7
Apache Thrift: PHP `thrift_protocol` accelerator dereferences a missing container-element spec
NULL pointer dereference vulnerability in Apache Thrift PHP bindings. This issue affects Apache Thrift: before 0.25.0. Users are recommended to upgrade to version 0.25.0, which fixes the issue.
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Medium 6.5
RT-Labs AB C-Open CANopen NULL pointer dereference
RT-Labs AB C-Open CANopen contains a NULL pointer dereference if the LSS protocol is used to configure the device. An object defined by the user application may not have all required subindexes for object 0x1018. An unauthenticated, remote attacker with acces…
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High 7.1
Unauthenticated Onboarding Connect NULL Pointer Dereference Denial of Service Vulnerability in TP-Link Tapo C120 & C200
Tapo C120 v1 and C200 v5 contain a NULL pointer dereference in the HTTPS onboarding connect request parser. The interface is reachable without authentication after initial setup and does not validate that a password field is present for certain authenticatio…
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High 7.5CVE-2026-63686 Public exploit
Apache HTTP Server: mod_xml2enc crash on charset conversion failure
A NULL pointer dereference in mod_xml2enc in Apache Software Foundation Apache HTTP Server before 2.4.69 on all platforms allows an untrusted backend server to cause a denial of service via a proxied response with a charset whose conversion partially succeeds…
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High 7.5
Apache HTTP Server: mod_heartmonitor denial of service
NULL Pointer Dereference vulnerability in Apache HTTP Servers mod_heartmonitor over unicast listener. This issue affects Apache HTTP Server: from 2.4.0 through 2.4.68.
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Medium 4.4
NVIDIA GPU Display Driver for Windows and Linux contains a vulnerability in the kernel mode layer where an attacker cou…
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Medium 4.4
NVIDIA GPU Display Driver for Windows and Linux contains a vulnerability in the firmware where an attacker could cause …
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Medium 5.5
NVIDIA GPU Display Driver for Windows contains a vulnerability in the kernel module where an attacker with local access…
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Medium 5.5
NVIDIA GPU Display Driver for Linux contains a vulnerability in the kernel mode layer where an unprivileged user could …
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Medium 5.5
NVIDIA GPU Display Driver for Linux contains a vulnerability in the kernel module where an unprivileged local user coul…
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Medium 5.5
NVIDIA GPU Display Driver for Linux contains a vulnerability in the kernel mode driver where a local user may cause a n…
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High 7.8
NVIDIA GPU Display Driver for Linux contains a vulnerability in the kernel mode layer where a user could cause a NULL p…
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High 7.5
A NULL pointer dereference vulnerability exists in Pgpool-II, which may allow an unauthenticated attacker to cause abno…
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High 8.7
Fireware OS Pre-Authentication NULL Pointer Dereference Allows Remote Denial of Service
A NULL pointer dereference vulnerability in the WatchGuard Fireware OS authentication process allows a remote, unauthenticated attacker to crash the management daemon by sending a specially request to the login interface, resulting in a denial of service.
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High 7.1
Fireware OS Missing Authorization in wgagent Management API Allows Denial of Service - Variant A
A missing authorization vulnerability in the wgagent management daemon's session initialization function allows an authenticated, low-privileged user (including a read-only or guest administrator account) to crash the wgagent process and read arbitrary files …
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High 8.2
Fireware OS NULL Pointer Dereference in NetFlow IPv6 Traffic Processing Allows Remote Denial of Service
A NULL pointer dereference vulnerability in Fireware OS's NetFlow packet-processing feature allows a remote, unauthenticated attacker to cause a denial of service by sending a specially crafted IPv6 packet.
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High 7.1
NULL pointer dereference when evicting the last MSRP attribute in a participant's list
In Eclipse ThreadX NetX Duo versions 6.4.0 through 6.5.2.202603a, built with VLAN and SRP support, evicting the last attribute in an MRP participant's list writes through a null successor pointer. An unauthenticated station on the same Layer 2 segment can fau…
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High 7.1
NULL Pointer Dereference on MSRP Attribute Table Exhaustion
In Eclipse ThreadX NetX Duo versions 6.4.0 through 6.5.2.202603a, built with VLAN and SRP support, the MSRP attribute lookup writes through the null pointer returned by its allocator when the ten-entry attribute table is full. An unauthenticated station on th…
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Medium 6.5
PX4 Autopilot through 1.17.0 NULL Pointer Dereference via sd_stress
PX4 Autopilot through 1.17.0 contains a NULL pointer dereference vulnerability in the sd_stress command where the -b byte count parameter is parsed without validation before being passed to malloc() and memset(). Attackers with shell access, including through…
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Medium 6.5
Kubevirt: kubevirt: virt-controller nil-pointer dereference via malformed ephemeral volume
A flaw was found in KubeVirt. An authenticated user with permission to create Virtual Machine Instances (VMIs) can cause a Denial of Service (DoS) by submitting a virtual machine definition with an empty ephemeral volume. The virt-controller component fails t…
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Medium 5.3
NULL Pointer Dereference in CMP Client Revocation Response Handling
Issue summary: A CMP client that requests certificate revocation on the basis of a PKCS#10 CSR may dereference a NULL pointer and terminate abnormally when processing a crafted revocation response. Impact summary: The NULL pointer dereference happens on a rea…
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Medium 5.5
NULL Pointer Dereference in Wireshark
PEAK CAN TRC file parser crash in 4.6.0 to 4.6.8 allows denial of service
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Medium 5.9
NULL pointer dereference in Zephyr LwM2M client when the CoAP Block1 context pool is exhausted
parse_write_op() in subsys/net/lib/lwm2m/lwm2m_message_handling.c handles inbound CoAP WRITE/CREATE requests that carry a Block1 option. For the first block of a transfer it called init_block_ctx() and then immediately stored the peer-selected block size with…
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Medium 5.3
Trusted Domain Project OpenARC libopenarc arc-canon.c arc_parse_canon_t null pointer dereference
A security flaw has been discovered in Trusted Domain Project OpenARC up to 1.0.0.Beta1. Impacted is the function arc_parse_canon_t in the library libopenarc/arc-canon.c of the component libopenarc. The manipulation results in null pointer dereference. The at…
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Medium 5.3
Trusted Domain Project OpenDMARC SPF Parser opendmarc_spf.c opendmarc_spf_ipv6_explode null pointer dereference
A flaw has been found in Trusted Domain Project OpenDMARC up to 1.4.2. Affected by this vulnerability is the function opendmarc_spf_ipv6_explode in the library libopendmarc/opendmarc_spf.c of the component SPF Parser. This manipulation of the argument cp caus…
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Medium 6.2
Espruino 2v29 (commit bffc6d0) contains a NULL pointer dereference vulnerability in jslGetRawString() in src/jslex.c. C…
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High 7.5
libde265 commit 4d45a6b contains a NULL pointer dereference vulnerability in the NAL parsing path. When de265_push_NAL(…
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Medium 5.5
OpenEXR 3.4.14 contains a NULL Pointer Dereference in the C++ attribute parsing path. A specially crafted EXR file cont…
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High 7.5
NULL pointer dereference in SCRAM client-final-message parsing in PgBouncer
Missing validation of a mandatory attribute in the SCRAM client-final-message parser in PgBouncer through 1.25.2 allows an unauthenticated remote attacker to crash the process. A malformed message can make the parser report success while leaving a required va…
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High 7.4
Deference after null check in as_rrc
NULL pointer dereference vulnerability in ASR Crane，Falcon on Linux (as_rrc module) allows Pointer Manipulation. This vulnerability is associated with program file 3g.mod/lib/src/urrsir.c.
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Medium 5.5
InDesign Desktop | NULL Pointer Dereference (CWE-476)
InDesign Desktop is affected by a NULL Pointer Dereference vulnerability that could result in an application denial-of-service. An attacker could exploit this vulnerability to crash the application, leading to a denial-of-service condition. Exploitation of th…
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Medium 5.5
InDesign Desktop | NULL Pointer Dereference (CWE-476)
InDesign Desktop is affected by a NULL Pointer Dereference vulnerability that could result in an application denial-of-service. An attacker could exploit this vulnerability to crash the application, leading to a denial-of-service condition. Exploitation of th…
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Medium 5.5
Notepad++: Null pointer dereference in NPPM_SAVESESSION message handler causes crash (DoS)
Notepad++ is a free and open-source source code editor. Prior to 8.9.8, the NPPM_SAVESESSION handler in PowerEditor/src/NppBigSwitch.cpp converts lParam to a sessionInfo pointer and dereferences its nbFile, files, and sessionFilePathName members without check…
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Medium 5.5
A NULL pointer dereference vulnerability exists in the gf_sg_vrml_field_clone() function of GPAC 2d7da22e (26.08-DEV). …
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High 7.5
Envoy ext_authz: request `:path` pseudoheader dereferenced w/o null check
Envoy is an open source edge and service proxy designed for cloud-native applications. Prior to 1.36.10, 1.37.6, 1.38.4, and 1.39.1, Envoy's ext_authz filter assumes that a request contains a :path pseudoheader when applying query_parameters_to_set or query_p…
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Medium 5.9
Envoy: HTTP/3 connection pool selection null-derefs in ProdClusterManagerFactory::allocateConnPool when transport_socket_options is null
Envoy is an open source edge and service proxy designed for cloud-native applications. Prior to 1.36.10, 1.37.6, 1.38.4, and 1.39.1, Envoy's ProdClusterManagerFactory::allocateConnPool dereferences transport_socket_options while selecting an HTTP/3 connection…
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Low 3.3
Suricata datasets: NULL pointer dereference in JSON/NDJSON dataset loading
Suricata is a network Intrusion Detection System, Intrusion Prevention System and Network Security Monitoring engine. From 8.0.0 until 8.0.6, src/datasets-context-json.c assumes that a configured JSON or NDJSON dataset value_key resolves to a string. A truste…
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Medium 5.5
WinFsp through 2.2.26215 NULL Pointer Dereference via Fast I/O
WinFsp through 2.2.26215 contains a null pointer dereference vulnerability in the kernel driver's Fast I/O device control handler that fails to validate the volume context before use. An unprivileged local user can trigger a denial of service by opening the W…