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
1,530 results · Clear filters · Feed
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Medium 5.5
FFmpeg 4.4 through 9.0.2 NULL Pointer Dereference via adx_decode_header()
FFmpeg 4.4 through 9.0.2 contains a NULL pointer dereference vulnerability in libavcodec/adxdec.c because adx_decode_header() updates the channel layout before validating the sample rate. Attackers can supply a crafted ADX/AAX stream with mid-stream new-extra…
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Medium 5.5
FFmpeg through 9.0.2 DPX Encoder NULL Pointer Dereference via encode_gbrp12()
FFmpeg through 9.0.2 contains a NULL pointer dereference vulnerability in libavcodec/dpxenc.c that allows attackers to crash the process via unvalidated bits_per_raw_sample for RGB48 input. Attackers can supply a 12-bit RGB image, such as JPEG 2000, that when…
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Medium 4.7
FFmpeg 7.1 through 9.0.2 NULL Pointer Dereference via ff_dovi_rpu_generate()
FFmpeg 7.1 through 9.0.2 contains a NULL pointer dereference vulnerability in ff_dovi_rpu_generate() in libavcodec/dovi_rpuenc.c that allows attackers to crash applications via crafted Dolby Vision RPU metadata. Attackers can supply streams with default or al…
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Medium 5.5
Fraunhofer HHI VVdeC through 3.2.1 NULL Pointer Dereference via InterPrediction::xPredInterBlk
Fraunhofer HHI VVdeC through 3.2.1 contains a NULL pointer dereference vulnerability in InterPrediction::xPredInterBlk that allows attackers to crash the decoder by switching SPS to enable reference wrap-around. Attackers can supply a crafted VVC bitstream ac…
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Medium 4.9
SiYuan before 3.8.9 Nil Pointer Dereference DoS via MCP resources/read
SiYuan before 3.8.9 contains a nil pointer dereference vulnerability in privateCacheMiddleware that allows authenticated attackers to crash the kernel by reading nonexistent MCP resources. Attackers with a valid API token can send a resources/read request in …
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Medium 6.7
Possible panic from Git source resolver
In BuildKit versions v0.26.0 through v0.34.1, a specific build definition that resolves metadata for the same Git source reference twice can cause the BuildKit daemon to panic and crash, interrupting builds handled by that daemon. The issue is fixed in v0.34.…
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Medium 6.5
NULL Pointer Dereference in Packetbeat Leading to Denial of Service
NULL Pointer Dereference (CWE-476) in the AMQP protocol parser in Packetbeat can lead to denial of service via specially crafted network traffic. An unauthenticated attacker who can send traffic on a network segment that Packetbeat monitors for AMQP can cause…
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Medium 5.4
NULL Pointer Dereference in H5HL_unprotect via Corrupted File
HDF5 through 2.2.0 contains a NULL pointer dereference vulnerability in H5HL_unprotect() in src/H5HL.c. H5HL_protect() pins a single metadata cache entry for a local heap, either the heap prefix or the separate data block, and H5HL_unprotect() unpins it on th…
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Medium 6.9
A NULL pointer dereference in the Linux GPU driver could potentially lead to a kernel crash and result in denial of ser…
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Medium 6.5
FreeRDP before 3.32.2 X11 Client Crash via Zero-Width RDPGFX ResetGraphics
FreeRDP before 3.32.2 contains a NULL pointer dereference vulnerability that allows malicious RDP servers to crash xfreerdp clients by sending a zero-width RDPGFX ResetGraphics PDU. The failed resize in gdi_resize_ex leaves the primary display null without en…
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Medium 4.3
FreeRDP before 3.32.2 Denial of Service via RD Gateway extended-auth packet
FreeRDP before 3.32.2 contains a denial of service vulnerability where rdg_process_packet dispatches a PKT_TYPE_EXTENDED_AUTH_MSG without verifying negotiated mode or auth context. A malicious or compromised RD Gateway can send the extended-auth packet before…
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Medium 5.5
The Sleuth Kit through 4.15.0 NULL Pointer Dereference via decmpfs LZVN Decompression
The Sleuth Kit through 4.15.0 contains a NULL pointer dereference vulnerability in decmpfs_decompress_lzvn_attr() that allows attackers to crash the tool by supplying a crafted HFS+ image. Attackers can set a huge uncompressed_size in an LZVN inline com.apple…
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Medium 6.5
Picotls has NULL pointer dereference during handshake, when running as a client
Picotls is a TLS protocol library that allows users select different crypto backends based on their use case. In affected revisions through 44bc503, when picotls is used as a `client-side TLS stack`, a peer can send a `HelloRetryRequest` followed by a `spoofe…
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Medium 5.3
Nezha 2.0.0 before 2.4.0 Startup NULL Pointer Dereference via Orphaned Service History
Nezha 2.0.0 before 2.4.0 contains a NULL pointer dereference vulnerability in ServiceSentinel.loadTodayStats that allows authenticated users to crash the dashboard by deleting a service. Attackers can delete their own service via POST /api/v1/batch-delete/ser…
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Medium 6.5
Gst-plugins-base: gst-plugins-base: null-pointer dereference in mdvdsub subtitle parser via missing closing-brace check
A flaw was found in GStreamer's gst-plugins-base MicroDVD subtitle parser. When processing a specially crafted subtitle file, the parser may dereference a NULL pointer, causing the application to crash when a user opens or plays media with a malformed MicroDV…
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Medium 6.5
Gst-plugins-bad: gst-plugins-bad: null pointer dereference in h.264 mvc sps cleanup during parse failure
A flaw was found in the H.264 video parser in gst-plugins-bad. When processing a specially crafted H.264 video file or network stream with malformed Multiview (MVC) Sequence Parameter Set data, the parser can dereference a NULL pointer during the cleanup of p…
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Medium 4.3
NULL pointer dereference vulnerability in QCborValue to JSON conversion impacts Qt
A NULL pointer dereference vulnerability in the Qt QCborValue to JSON conversion of the Qt Core module.
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Medium 5.9
Forge: TLS client crash when the server sends no certificate
Forge (also called node-forge) is a native implementation of Transport Layer Security in JavaScript. Prior to 1.4.1, the affected implementation used forge.tls.createConnection(), c.session.serverCertificate, RSA key exchange to process the relevant input or …
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Medium 6.5
389-ds-base: 389-ds-base: null pointer dereference via modifydn using an attribute's schema alias name causes denial of service
A NULL pointer dereference flaw was found in 389-ds-base. This flaw occurs when a ModifyDN (rename) operation uses an attribute's schema alias name (such as "commonName") instead of its canonical name (such as "cn") as the new relative distinguished name. An …
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Medium 5.9
libexpat through 2.9.0 NULL Pointer Dereference via External Entity Subparser
libexpat through 2.9.0 contains a NULL pointer dereference vulnerability in externalEntityInitProcessor2() in lib/xmlparse.c that mishandles the XML_TOK_NONE token from empty input. Attackers who control stream chunking can force an empty non-final first pars…
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Medium 6.5
Tanium addressed a denial of service vulnerability in Enforce.
Tanium addressed a denial of service vulnerability in Enforce.
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Medium 6.5
libcss through 0.9.2 NULL Pointer Dereference via Media-Query Parser
libcss through 0.9.2 contains a NULL pointer dereference vulnerability in mq_parse_media_query() that allows remote attackers to crash consumers by supplying media lists ending in a comma. Attackers can serve a stylesheet whose @media or @import media list ha…
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Medium 6.5
A null pointer dereference was addressed with improved validation. This issue is fixed in iOS 26.7.2 and iPadOS 26.7.2,…
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Medium 4.6
A null pointer dereference was addressed with improved validation. This issue is fixed in iOS 26.7.2 and iPadOS 26.7.2,…
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Medium 6.2
ONNX: Null Pointer Dereference in ScanInferenceFunction Due to Missing Required Attribute
Open Neural Network Exchange (ONNX) is an open standard for machine learning interoperability. From 1.4.0 until 1.22.0, ScanInferenceFunction, ScanInferenceFunction_opset8, and ScanInferenceFunction_opset9 do not safely validate the required num_scan_inputs a…
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Medium 6.5
Bluetooth Classic HFP AG wipes an object still linked in the SDP request list on connect failure, causing a NULL dereference
In the Bluetooth Classic Hands-Free Profile Audio Gateway role, hfp_ag_create() in subsys/bluetooth/host/classic/hfp_ag.c starts an SDP discovery toward the peer, which links the embedded ag->sdp_param._node into the SDP client's pending request list in subsy…
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Medium 5.5
Gssproxy: gssproxy: null pointer dereference in gssx_init_sec_context crashes daemon
A NULL pointer dereference vulnerability was found in gssproxy. When a GSSX_INIT_SEC_CONTEXT request is received with the target_name field absent, the daemon dereferences the resulting NULL pointer and crashes. The request requires no authentication, allowin…
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Medium 6.5
Null Pointer Dereference in Mailbox Error Handling
SOEM version 2.0.0 and earlier contains a vulnerability where a malicious device can crash the master system. When the software receives an error response, it clears an internal pointer but continues processing. If another message arrives before timeout, the …
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Medium 5.9
Apache Traffic Server: Nullptr dereference in net_write_io on a POST half-close with chunked response
Apache Traffic Server can crash with a null pointer dereference when a client POST request is torn down via half-close while a chunked origin response is being reparsed from a reentrant write-ready callback, a timing-dependent race introduced by the CVE-2021-…
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Medium 5.8
Multiple Cisco Products Snort 3 Generic Routing Encapsulation Denial of Service Vulnerabilities
Multiple Cisco products are affected by a vulnerability in the generic routing encapsulation (GRE) tunnel decapsulation feature of the Snort 3 Detection Engine that could allow an unauthenticated, remote attacker to cause an unexpected restart of the Snort 3 …
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Medium 6.5
Apache bRPC: Null pointer dereference in MySQL reply parser leading to client crash
The MySQL client response parser in Apache bRPC dereferences a null pointer when the server peer sends a zero-payload-length response packet. A response packet whose declared payload length is zero is accepted by the frame-length check (is_full_package), afte…
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Medium 5.3
Apache bRPC: NULL Pointer Dereference in RTMP createStream Error Path Leading to Remote Denial of Service
NULL pointer dereference in the RTMP protocol implementation in Apache bRPC (version < 1.18.0) on all platforms allows remote attackers to crash the server (denial of service) via a crafted createStream command. Root Cause: When an RTMP service rejects a crea…
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Medium 4.0
Null-pointer dereference in QTriangulator reachable through VectorImage
A malicious SVG can trigger an integer overflow which in turn triggers a null-pointer dereference in VectorImage QML Type.
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Medium 6.5
FreeRDP 3.0.0 before 3.32.0 null-pointer dereference via emulated smartcard
FreeRDP 3.0.0 before 3.32.0 contains a null-pointer dereference in the smartcard emulation backend that accepts a null per-reader name in SCardGetStatusChange requests. A malicious RDP server can send a crafted reader-state entry with a null szReader, causing…
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Medium 5.5
A NULL pointer dereference in the gf_ac4_presentation_ch_mode function (/media_tools/av_parsers.c) of GPAC Project/MP4B…
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Medium 5.5
A NULL pointer dereference in the StatSFVec2f function (/scene_manager/scene_stats.c) of GPAC Project/MP4Box before 2.5…
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Medium 5.5
A segmentation violation in the gf_isom_get_esd function (/isomedia/isom_read.c) of GPAC Project/MP4Box before 2.5 allo…
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Medium 5.5
A segmentation violation in the check_media_profile function (/mp4box/mp4box.c) of GPAC Project/MP4Box before 2.5 allow…
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Medium 5.5
A NULL pointer dereference in the dasher_insert_timeline_entry function (/filters/dasher.c) of GPAC Project/MP4Box befo…
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Medium 5.5
HarfBuzz 8.0.0 through 14.6.0 WebAssembly Shaper NULL Pointer Dereference DoS
HarfBuzz from 8.0.0 through 14.6.0 contains a NULL pointer dereference vulnerability in the experimental WebAssembly shaper host imports buffer_set_contents, face_create, and font_set_coords. Attackers can supply a crafted font whose embedded wasm module pass…