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)
-
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].
-
Requirements
Select a programming language that is not susceptible to these issues.
-
Implementation
Check the results of all functions that return a value and verify that the value is non-null before acting upon it.
-
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.
-
Implementation
Explicitly initialize all variables and other data stores, either during declaration or just before the first usage.
Source: MITRE CWE-476
1,545 results · Clear filters · Feed
-
Medium 5.9
strongSwan 4.1.10 through 6.0.7 allows a NULL pointer dereference in the eap-aka plugin.
-
Medium 6.5
A NULL pointer dereference vulnerability exists in the Prism parser component of mruby 4.0.0. An attacker can provide a…
-
Medium 6.2CVE-2026-86547 Public exploit
mrubyc through 4.0.0 NULL Pointer Dereference via OP_ENTER
mrubyc through 4.0.0 contains a null pointer dereference vulnerability in the op_enter() handler in src/vm.c when processing untrusted bytecode. Attackers can craft malicious .mrb bytecode files with OP_ENTER instructions at the top level to crash the embeddi…
-
Medium 6.5
Skype for Business and Lync Denial of Service Vulnerability
Null pointer dereference in Skype for Business allows an authorized attacker to deny service over a network.
-
Medium 5.3
Windows Schannel Denial of Service Vulnerability
Null pointer dereference in Windows Schannel allows an authorized attacker to deny service over a network.
-
Medium 6.5
Windows Active Directory Domain Services Denial of Service Vulnerability
Null pointer dereference in Active Directory Domain Services allows an authorized attacker to deny service over a network.
-
Medium 6.5
Windows Routing and Remote Access Service (RRAS) Denial of Service Vulnerability
Null pointer dereference in Windows Routing and Remote Access Service (RRAS) allows an authorized attacker to deny service over a network.
-
Medium 6.5
Null Pointer Dereference in MongoDB Server 2dsphere Index Key Generation Leads to Denial of Service
A security issue exists in MongoDB's 2dsphere index key generation that can cause a server crash due to a null pointer dereference. When a specially crafted GeoJSON document is inserted into a collection with a 2dsphere index, an inconsistency in geometry par…
-
Medium 6.5
PX4 Autopilot through 1.17.0 Null Pointer Dereference via param select
PX4 Autopilot through 1.17.0 contains a null pointer dereference vulnerability in param_set_default_file() and param_set_backup_file() functions that allows attackers to crash the autopilot process. Attackers can invoke 'param select' or 'param select-backup'…
-
Medium 6.5
IBM i is Affected By Multiple Vulnerabilities in Debug Server
IBM i 7.6, 7.5, 7.4, and 7.3 could allow a remote authenticated attacker to cause a denial of service due to a NULL pointer dereference.
-
Medium 5.9
RTU500 has a vulnerability, where high-load scenarios, such as sending GI requests at short intervals, may cause a NULL…
-
Medium 5.5
NULL pointer dereference vulnerability in Samsung Open Source mTower allows Pointer Manipulation. This issue affects mT…
-
Medium 4.3
FLVMeta AMF Object Parsing amf.c amf_object_get null pointer dereference
A vulnerability was determined in FLVMeta up to 1.2.2. Affected by this vulnerability is the function amf_object_get of the file src/amf.c of the component AMF Object Parsing. This manipulation causes null pointer dereference. The attack may be initiated remo…
-
Medium 5.3
armink struct2json JSON Deserialization s2jdef.h S2J_STRUCT_GET_string_ELEMENT null pointer dereference
A vulnerability has been found in armink struct2json 1.0. This affects the function S2J_STRUCT_GET_string_ELEMENT in the library struct2json/inc/s2jdef.h of the component JSON Deserialization. The manipulation of the argument valuestring leads to null pointer…
-
Medium 4.3
Open5GS Transfer Endpoint namf-handler.c null pointer dereference
A vulnerability was identified in Open5GS up to 2.7.7. This issue affects some unknown processing of the file src/amf/namf-handler.c of the component Transfer Endpoint. Such manipulation leads to null pointer dereference. The attack can be launched remotely. …
-
Medium 5.3
Pre-Authentication NULL Pointer Dereference in UPnP SOAP State Variable Query Processing in TP-Link TL-WR841N
A NULL pointer dereference vulnerability exists in TL-WR841N v14 in the UPnP service when processing SOAP state variable query requests. A specially crafted SOAP query may trigger unexpected termination or instability of the process hosting the UPnP service. …
-
Medium 5.3
Pre-Authentication NULL Pointer Dereference in UPnP SOAP Action Request Processing in TP-Link TL-WR841N
A NULL pointer dereference vulnerability exists in TL-WR841N v14 in the UPnP service when processing SOAP action requests. A specially crafted SOAP action request containing unexpected XML content may cause the UPnP daemon to terminate unexpectedly. Successfu…
-
Medium 4.9
PLANET GS-4210-16P2S V3 Stack Buffer Overflow and NULL Pointer Dereference via dispatcher.cgi RADIUS Handlers
PLANET GS-4210-16P2S V3 firmware before 3.441b260626 contains authenticated stack buffer overflow and null pointer dereference vulnerabilities in /cgi-bin/dispatcher.cgi. The web_radiusSrv*_post family of handlers copies the radKey, radKey_0, radDftParamKey, …
-
Medium 4.9
PLANET GS-4210-16P2S V3 Null Pointer Dereference DoS via dispatcher.cgi web_poe_alive_rmtip_post
PLANET GS-4210-16P2S V3 firmware before 3.441b260626 contains an authenticated null pointer dereference vulnerability in /cgi-bin/dispatcher.cgi. The web_poe_alive_rmtip_post handler dereferences the rmtIP parameter without verifying its presence. A remote au…
-
Medium 5.3
Wazuh agent enrollment NULL pointer dereference via malformed manager response
Wazuh is an open-source security platform providing unified XDR and SIEM protection for endpoints and cloud workloads. In versions 4.0.0 through 4.14.6, a malicious or man-in-the-middle enrollment manager can crash a Wazuh agent during enrollment by returning…
-
Medium 5.5
A null pointer dereference was addressed with improved input validation. This issue is fixed in iOS 18.7.9 and iPadOS 1…
-
Medium 5.5
Substance3D - Designer | NULL Pointer Dereference (CWE-476)
Substance3D - Designer 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…
-
Medium 5.9
NULL-pointer dereference in Zephyr OCPP CALLRESULT parsing via unchecked strtok_r/atoi
The OCPP 1.6 client in subsys/net/lib/ocpp/ocpp.c reconstructs a session handle and PDU id from the uid field of a CALLRESULT message. In ocpp_process_server_msg() the code calls atoi(strtok_r(uid, "-", &tmp)) without checking the strtok_r return value. When …
-
Medium 5.3
rclone before v1.75.0 Denial of Service via TUS nil-response panic
rclone before v1.75.0 contains a denial of service vulnerability in the WebDAV TUS creation handler that dereferences a nil response before checking for transport errors. A malicious or compromised configured endpoint can reset connections during TUS uploads …
-
Medium 6.9
OpenEXR: OpenEXRCore exr_attr_set_bytes() accepts NULL type_hint with positive hint_length
OpenEXR is the reference implementation and specification for the EXR high-dynamic-range image file format, widely used in the motion picture industry. Versions 3.4.0 through 3.4.12 contain a NULL pointer dereference in the OpenEXRCore function exr_attr_set_b…
-
Medium 5.3
Bluetooth HAS: NULL-pointer dereference DoS when a bonded peer reconnects before bt_has_register
The Hearing Access Service (HAS) GATT server in subsys/bluetooth/audio/has.c installs a connection-callback set unconditionally via BT_CONN_CB_DEFINE, so security_changed() runs for every connection that establishes security even before the application has ca…
-
Medium 4.9
DrayTek VigorSwitch Multiple Models NULL Pointer Dereference via formlogout
Multiple DrayTek VigorSwitch models contain a null pointer dereference vulnerability in the formlogout function. The vulnerability is caused by missing checks for an empty or absent Cookie header before string handling. A remote attacker can trigger this vuln…
-
Medium 5.3
ggml-org llama.cpp ggml-RPC Server ggml-rpc.cpp graph_compute null pointer dereference
A vulnerability was determined in ggml-org llama.cpp bec4772f6. This affects the function rpc_server::graph_compute of the file ggml/src/ggml-rpc/ggml-rpc.cpp of the component ggml-RPC Server. Executing a manipulation can lead to null pointer dereference. The…
-
Medium 4.4
Incus has a Nil-Pointer Dereference Panic via Instance Backup Import (volume omitted)
Incus is a system container and virtual machine manager. Prior to version 7.1.0, `(*backend).CreateInstanceFromBackup` in `internal/server/storage/backend.go` contains a nil-pointer dereference that an authenticated user with permission to create instances in…
-
Medium 4.7
Vulnerabilities in IBM AIX and PowerVM VIOS
IBM AIX 7.2, and 7.3 and IBM PowerVM VIOS 4.1 could allow a local attacker to cause a denial of service due to a NULL pointer dereference.
-
Medium 5.7
Libevent: Null Pointer Dereference in `evws_new_session`
Libevent is an event notification library. Prior to 2.2.2-alpha, libevent can dereference invalid list pointers in ws.c when evws_new_session enters its error path after evhttp_start_ws_ succeeds but bufferevent_enable_locking_ fails. evws_connection_free see…
-
Medium 6.5
Ipa: freeipa: null pointer dereference in `ipa-enrollment` extended operation (`join_oid`) via missing request value
A flaw was found in the `ipa-enrollment` SLAPI plugin. A remote authenticated client can exploit a null pointer dereference vulnerability by sending a malformed Lightweight Directory Access Protocol (LDAP) extended operation. By omitting the request value for…
-
Medium 4.7
NULL Pointer Dereference in Wireshark
H.245 protocol dissector crash in 4.6.0 to 4.6.7 and 4.4.0 to 4.4.18 allows denial of service
-
Medium 5.5
NULL Pointer Dereference in Wireshark
Bluetooth BR/EDR FHS protocol dissector crash in 4.6.0 to 4.6.7 and 4.4.0 to 4.4.18 allows denial of service
-
Medium 4.7
NULL Pointer Dereference in Wireshark
CMS protocol dissector crash in 4.6.0 to 4.6.7 and 4.4.0 to 4.4.18 allows denial of service
-
Medium 6.5
Vulnerabilities in IBM AIX and PowerVM VIOS
IBM AIX 7.2, and 7.3 and IBM PowerVM VIOS 4.1 could allow a remote attacker to cause a denial of service due to a null pointer dereference.
-
Medium 5.3
Vulnerabilities in IBM AIX and PowerVM VIOS
IBM AIX 7.2, and 7.3 and IBM PowerVM VIOS 4.1 could allow a remote attacker to cause a denial of service due to a NULL pointer dereference.
-
Medium 6.5
WeKan Board Export REST Endpoints: NULL Pointer Dereference on Invalid authToken Leads to Uncaught Exception / Remote Denial of Service
Wekan is open source kanban built with Meteor. Prior to 10.38, the /api/boards/:boardId/export, /api/boards/:boardId/attachments/:attachmentId/export, /api/boards/:boardId/export/csv, and /api/boards/:boardId/exportExcel handlers in models/export.js and model…
-
Medium 4.3
Modcluster-core: mod_cluster advertise listener: unauthenticated dos via crafted multicast datagram
A flaw was found in mod_cluster's AdvertiseListenerImpl (org.jboss.modcluster core module). A single crafted UDP multicast datagram with a valid HTTP status line and a "Server:" header but without the "Date:", "Digest:", and "Sequence:" headers triggers a Nul…
-
Medium 5.3
kin-openapi openapi3filter: unauthenticated nil-pointer panic when validating a request against a `content` parameter whose media type has no schema
kin-openapi is a Go project for handling OpenAPI files. From 0.2.0 until 0.144.0, openapi3filter.ValidateRequest can encounter a NULL-pointer-dereference denial of service when an operation declares a content parameter whose application/json media type has no…