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CWE-476

5,437 CVEs • Abstraction: Base • Likelihood of Exploit: Medium

NULL Pointer Dereference

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

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CVEs (5,437)

CVE
VENDORS
PRODUCTS
UPDATED
PUBLISHED
CVSS
1Openbsd
1Openbsd
Nov 21, 2024
Jun 22, 2021
N/A· v4
7.5 HIGH· v3
5.0 MEDIUM· v2
It was found in FreeBSD 8.0, 6.3 and 4.9, and OpenBSD 4.6 that a null pointer dereference in ftpd/popen.c may lead to remote denial of service of the ftpd service.
1Google
1Android
Jun 17, 2026
Jun 22, 2021
N/A· v4
7.5 HIGH· v3
5.0 MEDIUM· v2
In RenderStruct of protostream_objectsource.cc, there is a possible crash due to a missing null check. This could lead to remote denial of service with no additional execution privileges needed. User interaction is not n...Show more
In RenderStruct of protostream_objectsource.cc, there is a possible crash due to a missing null check. This could lead to remote denial of service with no additional execution privileges needed. User interaction is not needed for exploitation.Product: AndroidVersions: Android-11Android ID: A-179161711Show less
1F Secure
4Cloud Protection For Salesforce
Elements For Microsoft 365Endpoint Protection+1 more
Jun 17, 2026
Jun 21, 2021
N/A· v4
6.5 MEDIUM· v3
4.0 MEDIUM· v2
A Denial-of-Service (DoS) vulnerability was discovered in F-Secure Linux Security whereby the FSAVD component used in certain F-Secure products can crash while scanning larger packages/fuzzed files. The exploit can be tr...Show more
A Denial-of-Service (DoS) vulnerability was discovered in F-Secure Linux Security whereby the FSAVD component used in certain F-Secure products can crash while scanning larger packages/fuzzed files. The exploit can be triggered remotely by an attacker. A successful attack will result in Denial-of-Service (DoS) of the Anti-Virus engine.Show less
4Apache
DebianFedoraproject+1 more
6Debian Linux
Enterprise Manager Ops CenterFedora+3 more
Jun 17, 2026
Jun 15, 2021
N/A· v4
7.5 HIGH· v3
5.0 MEDIUM· v2
Apache HTTP Server protocol handler for the HTTP/2 protocol checks received request headers against the size limitations as configured for the server and used for the HTTP/1 protocol as well. On violation of these restri...Show more
Apache HTTP Server protocol handler for the HTTP/2 protocol checks received request headers against the size limitations as configured for the server and used for the HTTP/1 protocol as well. On violation of these restrictions and HTTP response is sent to the client with a status code indicating why the request was rejected. This rejection response was not fully initialised in the HTTP/2 protocol handler if the offending header was the very first one received or appeared in a a footer. This led to a NULL pointer dereference on initialised memory, crashing reliably the child process. Since such a triggering HTTP/2 request is easy to craft and submit, this can be exploited to DoS the server. This issue affected mod_http2 1.15.17 and Apache HTTP Server version 2.4.47 only. Apache HTTP Server 2.4.47 was never released.Show less
2Debian
Long Range Zip Project
2Debian Linux
Long Range Zip
Jun 17, 2026
Jun 10, 2021
N/A· v4
5.5 MEDIUM· v3
4.3 MEDIUM· v2
A null pointer dereference was discovered in ucompthread in stream.c in Irzip 0.631 which allows attackers to cause a denial of service (DOS) via a crafted compressed file.
2Debian
Long Range Zip Project
2Debian Linux
Long Range Zip
Jun 17, 2026
Jun 10, 2021
N/A· v4
5.5 MEDIUM· v3
4.3 MEDIUM· v2
A null pointer dereference was discovered lzo_decompress_buf in stream.c in Irzip 0.621 which allows an attacker to cause a denial of service (DOS) via a crafted compressed file.
2Fedoraproject
Trusteddomain
2Fedora
Opendmarc
Jun 17, 2026
Jun 10, 2021
N/A· v4
7.5 HIGH· v3
5.0 MEDIUM· v2
OpenDMARC 1.4.1 and 1.4.1.1 allows remote attackers to cause a denial of service (NULL pointer dereference and application crash) via a multi-value From header field.
4Apache
DebianFedoraproject+1 more
6Debian Linux
Enterprise Manager Ops CenterFedora+3 more
Jun 17, 2026
Jun 10, 2021
N/A· v4
7.5 HIGH· v3
5.0 MEDIUM· v2
Apache HTTP Server versions 2.4.0 to 2.4.46 A specially crafted Cookie header handled by mod_session can cause a NULL pointer dereference and crash, leading to a possible Denial Of Service
4Apache
DebianFedoraproject+1 more
6Debian Linux
Enterprise Manager Ops CenterFedora+3 more
Jun 17, 2026
Jun 10, 2021
N/A· v4
7.5 HIGH· v3
5.0 MEDIUM· v2
Apache HTTP Server versions 2.4.41 to 2.4.46 mod_proxy_http can be made to crash (NULL pointer dereference) with specially crafted requests using both Content-Length and Transfer-Encoding headers, leading to a Denial of...Show more
Apache HTTP Server versions 2.4.41 to 2.4.46 mod_proxy_http can be made to crash (NULL pointer dereference) with specially crafted requests using both Content-Length and Transfer-Encoding headers, leading to a Denial of ServiceShow less
1Sap
1Netweaver As Abap
Jun 17, 2026
Jun 9, 2021
N/A· v4
7.5 HIGH· v3
5.0 MEDIUM· v2
SAP NetWeaver ABAP Server and ABAP Platform (Enqueue Server), versions - KRNL32NUC - 7.22,7.22EXT, KRNL64NUC - 7.22,7.22EXT,7.49, KRNL64UC - 8.04,7.22,7.22EXT,7.49,7.53,7.73, KERNEL - 7.22,8.04,7.49,7.53,7.73, allows an...Show more
SAP NetWeaver ABAP Server and ABAP Platform (Enqueue Server), versions - KRNL32NUC - 7.22,7.22EXT, KRNL64NUC - 7.22,7.22EXT,7.49, KRNL64UC - 8.04,7.22,7.22EXT,7.49,7.53,7.73, KERNEL - 7.22,8.04,7.49,7.53,7.73, allows an unauthenticated attacker without specific knowledge of the system to send a specially crafted packet over a network which will trigger an internal error in the system due to improper input validation in method EnqConvUniToSrvReq() causing the system to crash and rendering it unavailable. In this attack, no data in the system can be viewed or modified.Show less
1Sap
1Netweaver As Abap
Jun 17, 2026
Jun 9, 2021
N/A· v4
7.5 HIGH· v3
5.0 MEDIUM· v2
SAP NetWeaver ABAP Server and ABAP Platform (Enqueue Server), versions - KRNL32NUC - 7.22,7.22EXT, KRNL64NUC - 7.22,7.22EXT,7.49, KRNL64UC - 8.04,7.22,7.22EXT,7.49,7.53,7.73, KERNEL - 7.22,8.04,7.49,7.53,7.73, allows an...Show more
SAP NetWeaver ABAP Server and ABAP Platform (Enqueue Server), versions - KRNL32NUC - 7.22,7.22EXT, KRNL64NUC - 7.22,7.22EXT,7.49, KRNL64UC - 8.04,7.22,7.22EXT,7.49,7.53,7.73, KERNEL - 7.22,8.04,7.49,7.53,7.73, allows an unauthenticated attacker without specific knowledge of the system to send a specially crafted packet over a network which will trigger an internal error in the system due to improper input validation in method EnqConvUniToSrvReq() causing the system to crash and rendering it unavailable. In this attack, no data in the system can be viewed or modified.Show less
1Sap
1Netweaver As Abap
Jun 17, 2026
Jun 9, 2021
N/A· v4
7.5 HIGH· v3
5.0 MEDIUM· v2
SAP NetWeaver ABAP Server and ABAP Platform (Enqueue Server), versions - KRNL32NUC - 7.22,7.22EXT, KRNL64NUC - 7.22,7.22EXT,7.49, KRNL64UC - 8.04,7.22,7.22EXT,7.49,7.53,7.73, KERNEL - 7.22,8.04,7.49,7.53,7.73, allows an...Show more
SAP NetWeaver ABAP Server and ABAP Platform (Enqueue Server), versions - KRNL32NUC - 7.22,7.22EXT, KRNL64NUC - 7.22,7.22EXT,7.49, KRNL64UC - 8.04,7.22,7.22EXT,7.49,7.53,7.73, KERNEL - 7.22,8.04,7.49,7.53,7.73, allows an unauthenticated attacker without specific knowledge of the system to send a specially crafted packet over a network which will trigger an internal error in the system due to improper input validation in method EnqConvUniToSrvReq() causing the system to crash and rendering it unavailable. In this attack, no data in the system can be viewed or modified.Show less
1Sap
1Netweaver As Abap
Jun 17, 2026
Jun 9, 2021
N/A· v4
7.5 HIGH· v3
5.0 MEDIUM· v2
SAP NetWeaver ABAP Server and ABAP Platform (Dispatcher), versions - KRNL32NUC - 7.22,7.22EXT, KRNL32UC - 7.22,7.22EXT, KRNL64NUC - 7.22,7.22EXT,7.49, KRNL64UC - 8.04,7.22,7.22EXT,7.49,7.53,7.73, KERNEL - 7.22,8.04,7.49,...Show more
SAP NetWeaver ABAP Server and ABAP Platform (Dispatcher), versions - KRNL32NUC - 7.22,7.22EXT, KRNL32UC - 7.22,7.22EXT, KRNL64NUC - 7.22,7.22EXT,7.49, KRNL64UC - 8.04,7.22,7.22EXT,7.49,7.53,7.73, KERNEL - 7.22,8.04,7.49,7.53,7.73,7.77,7.81,7.82,7.83, allows an unauthenticated attacker without specific knowledge of the system to send a specially crafted packet over a network which will trigger an internal error in the system due to improper input validation in method ThSncIn() causing the system to crash and rendering it unavailable. In this attack, no data in the system can be viewed or modified.Show less
1Tianocore
1Edk2
Jun 17, 2026
Jun 3, 2021
N/A· v4
7.8 HIGH· v3
4.6 MEDIUM· v2
Null pointer dereference in Tianocore EDK2 may allow an authenticated user to potentially enable escalation of privilege via local access.
4Debian
FedoraprojectQemu+1 more
5Debian Linux
Enterprise LinuxFedora+2 more
Jun 17, 2026
Jun 2, 2021
N/A· v4
6.5 MEDIUM· v3
2.1 LOW· v2
The ahci_commit_buf function in ide/ahci.c in QEMU allows attackers to cause a denial of service (NULL dereference) when the command header 'ad->cur_cmd' is null.
2Fedoraproject
Qemu
2Fedora
Qemu
Jun 17, 2026
Jun 2, 2021
N/A· v4
6.0 MEDIUM· v3
2.1 LOW· v2
A NULL pointer dereference flaw was found in the megasas-gen2 SCSI host bus adapter emulation of QEMU in versions before and including 6.0. This issue occurs in the megasas_command_cancelled() callback function while dro...Show more
A NULL pointer dereference flaw was found in the megasas-gen2 SCSI host bus adapter emulation of QEMU in versions before and including 6.0. This issue occurs in the megasas_command_cancelled() callback function while dropping a SCSI request. This flaw allows a privileged guest user to crash the QEMU process on the host, resulting in a denial of service. The highest threat from this vulnerability is to system availability.Show less
3Fedoraproject
Nitro Enclaves ProjectRedhat
3Enterprise Linux
FedoraNitro Enclaves
Jun 17, 2026
Jun 1, 2021
N/A· v4
6.7 MEDIUM· v3
7.2 HIGH· v2
A flaw null pointer dereference in the Nitro Enclaves kernel driver was found in the way that Enclaves VMs forces closures on the enclave file descriptor. A local user of a host machine could use this flaw to crash the s...Show more
A flaw null pointer dereference in the Nitro Enclaves kernel driver was found in the way that Enclaves VMs forces closures on the enclave file descriptor. A local user of a host machine could use this flaw to crash the system or escalate their privileges on the system.Show less
1Gnu
1Gama
Jun 17, 2026
May 28, 2021
N/A· v4
7.5 HIGH· v3
5.0 MEDIUM· v2
A NULL-pointer deference issue was discovered in GNU_gama::set() in ellipsoid.h in Gama 2.04 which can lead to a denial of service (DOS) via segment faults caused by crafted inputs.
1Redhat
1389 Directory Server
Jun 17, 2026
May 28, 2021
N/A· v4
6.5 MEDIUM· v3
4.0 MEDIUM· v2
When using a sync_repl client in 389-ds-base, an authenticated attacker can cause a NULL pointer dereference using a specially crafted query, causing a crash.
2Debian
Qemu
2Debian Linux
Qemu
Jun 17, 2026
May 28, 2021
N/A· v4
4.4 MEDIUM· v3
2.1 LOW· v2
A NULL pointer dereference flaw was found in the am53c974 SCSI host bus adapter emulation of QEMU in versions before 6.0.0. This issue occurs while handling the 'Information Transfer' command. This flaw allows a privileg...Show more
A NULL pointer dereference flaw was found in the am53c974 SCSI host bus adapter emulation of QEMU in versions before 6.0.0. This issue occurs while handling the 'Information Transfer' command. This flaw allows a privileged guest user to crash the QEMU process on the host, resulting in a denial of service. The highest threat from this vulnerability is to system availability.Show less