Common Weakness Enumeration

CWE-476

Allowed

NULL Pointer Dereference

Abstraction: Base · Status: Stable

API response cwe.mitre.org

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

6310 vulnerabilities reference this CWE, most recent first.

CVE-2021-4188 (GCVE-0-2021-4188)

Vulnerability from cvelistv5 – Published: 2021-12-30 06:55 – Updated: 2024-08-03 17:16
VLAI
Title
NULL Pointer Dereference in mruby/mruby
Summary
mruby is vulnerable to NULL Pointer Dereference
Severity
6.8 (Medium)
CVSS:3.0/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H
CWE
  • CWE-476 - NULL Pointer Dereference
Assigner
References
Impacted products
Vendor Product Version
mruby mruby/mruby Affected: unspecified , < 3.1 (custom)
Create a notification for this product.
Show details on NVD website
To clipboard 

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CVE-2021-4158 (GCVE-0-2021-4158)

Vulnerability from cvelistv5 – Published: 2022-08-24 15:10 – Updated: 2024-08-03 17:16
VLAI
Summary
A NULL pointer dereference issue was found in the ACPI code of QEMU. A malicious, privileged user within the guest could use this flaw to crash the QEMU process on the host, resulting in a denial of service condition.
Severity
No CVSS data available.
CWE
  • CWE-476 - - NULL Pointer Dereference
Assigner
References
Impacted products
Vendor Product Version
n/a QEMU Affected: Affects v6.0.0 and above.
Show details on NVD website
To clipboard 

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CVE-2021-4145 (GCVE-0-2021-4145)

Vulnerability from cvelistv5 – Published: 2022-01-25 19:11 – Updated: 2024-08-03 17:16
VLAI
Summary
A NULL pointer dereference issue was found in the block mirror layer of QEMU in versions prior to 6.2.0. The `self` pointer is dereferenced in mirror_wait_on_conflicts() without ensuring that it's not NULL. A malicious unprivileged user within the guest could use this flaw to crash the QEMU process on the host when writing data reaches the threshold of mirroring node.
Severity
No CVSS data available.
CWE
Assigner
References
Impacted products
Vendor Product Version
n/a QEMU Affected: qemu-kvm 6.2.0
Show details on NVD website
To clipboard 

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CVE-2021-4110 (GCVE-0-2021-4110)

Vulnerability from cvelistv5 – Published: 2021-12-15 04:40 – Updated: 2024-08-03 17:16
VLAI
Title
NULL Pointer Dereference in mruby/mruby
Summary
mruby is vulnerable to NULL Pointer Dereference
Severity
9.1 (Critical)
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H
CWE
  • CWE-476 - NULL Pointer Dereference
Assigner
References
Impacted products
Vendor Product Version
mruby mruby/mruby Affected: unspecified , < 3.1 (custom)
Create a notification for this product.
Show details on NVD website
To clipboard 

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CVE-2021-4095 (GCVE-0-2021-4095)

Vulnerability from cvelistv5 – Published: 2022-03-08 14:05 – Updated: 2024-08-03 17:16
VLAI
Summary
A NULL pointer dereference was found in the Linux kernel's KVM when dirty ring logging is enabled without an active vCPU context. An unprivileged local attacker on the host may use this flaw to cause a kernel oops condition and thus a denial of service by issuing a KVM_XEN_HVM_SET_ATTR ioctl. This flaw affects Linux kernel versions prior to 5.17-rc1.
Severity
No CVSS data available.
CWE
Assigner
References
Impacted products
Vendor Product Version
n/a kernel Affected: Linux kernel versions prior to 5.17-rc1
Show details on NVD website
To clipboard 

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CVE-2021-4043 (GCVE-0-2021-4043)

Vulnerability from cvelistv5 – Published: 2022-02-04 00:00 – Updated: 2024-11-08 04:55
VLAI
Title
NULL Pointer Dereference in gpac/gpac
Summary
NULL Pointer Dereference in GitHub repository gpac/gpac prior to 1.1.0.
Severity
5.8 (Medium)
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:L
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
  • CWE-476 - NULL Pointer Dereference
Assigner
References
Impacted products
Vendor Product Version
gpac gpac/gpac Affected: unspecified , < 1.1.0 (custom)
Create a notification for this product.
gpac gpac Affected: 0 , < 1.1.0 (custom)
    cpe:2.3:a:gpac:gpac:*:*:*:*:*:*:*:*
 Create a notification for this product.
debian debian_linux Affected: 11.0
    cpe:2.3:o:debian:debian_linux:11.0:*:*:*:*:*:*:*
 Create a notification for this product.
Show details on NVD website
To clipboard 

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CVE-2021-3739 (GCVE-0-2021-3739)

Vulnerability from cvelistv5 – Published: 2022-03-07 15:19 – Updated: 2024-08-03 17:01
VLAI
Summary
A NULL pointer dereference flaw was found in the btrfs_rm_device function in fs/btrfs/volumes.c in the Linux Kernel, where triggering the bug requires ‘CAP_SYS_ADMIN’. This flaw allows a local attacker to crash the system or leak kernel internal information. The highest threat from this vulnerability is to system availability.
Severity
No CVSS data available.
CWE
  • CWE-476 - - NULL Pointer Dereference
Assigner
References
Impacted products
Vendor Product Version
n/a kernel Affected: Fixed in v5.15-rc1 and above.
Show details on NVD website
To clipboard 

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CVE-2021-3671 (GCVE-0-2021-3671)

Vulnerability from cvelistv5 – Published: 2021-10-12 00:00 – Updated: 2024-08-03 17:01
VLAI
Summary
A null pointer de-reference was found in the way samba kerberos server handled missing sname in TGS-REQ (Ticket Granting Server - Request). An authenticated user could use this flaw to crash the samba server.
Severity
No CVSS data available.
CWE
Assigner
References
Impacted products
Vendor Product Version
n/a Samba Affected: Fixed in samba 4.13.12, samba 4.14.8
Show details on NVD website
To clipboard 

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CVE-2021-3596 (GCVE-0-2021-3596)

Vulnerability from cvelistv5 – Published: 2022-02-24 00:00 – Updated: 2024-08-03 17:01
VLAI
Summary
A NULL pointer dereference flaw was found in ImageMagick in versions prior to 7.0.10-31 in ReadSVGImage() in coders/svg.c. This issue is due to not checking the return value from libxml2's xmlCreatePushParserCtxt() and uses the value directly, which leads to a crash and segmentation fault.
Severity
No CVSS data available.
CWE
Assigner
References
Impacted products
Vendor Product Version
n/a ImageMagick Affected: ImageMagick 7.0.10-31
Show details on NVD website
To clipboard 

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CVE-2021-3537 (GCVE-0-2021-3537)

Vulnerability from cvelistv5 – Published: 2021-05-14 19:50 – Updated: 2024-08-03 17:01
VLAI
Summary
A vulnerability found in libxml2 in versions before 2.9.11 shows that it did not propagate errors while parsing XML mixed content, causing a NULL dereference. If an untrusted XML document was parsed in recovery mode and post-validated, the flaw could be used to crash the application. The highest threat from this vulnerability is to system availability.
Severity
No CVSS data available.
CWE
Assigner
References
Impacted products
Vendor Product Version
n/a libxml2 Affected: libxml2 2.9.11
Show details on NVD website
To clipboard 

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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.

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