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.

6350 vulnerabilities reference this CWE, most recent first.

CVE-2021-22570 (GCVE-0-2021-22570)

Vulnerability from cvelistv5 – Published: 2022-01-26 00:00 – Updated: 2025-04-21 13:56
VLAI
Title
Nullptr Dereference in Protobuf
Summary
Nullptr dereference when a null char is present in a proto symbol. The symbol is parsed incorrectly, leading to an unchecked call into the proto file's name during generation of the resulting error message. Since the symbol is incorrectly parsed, the file is nullptr. We recommend upgrading to version 3.15.0 or greater.
Severity
6.5 (Medium)
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
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
Google LLC Protobuf Affected: unspecified , < 3.15.0 (custom)
Create a notification for this product.
Show details on NVD website
To clipboard 

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CVE-2021-21702 (GCVE-0-2021-21702)

Vulnerability from cvelistv5 – Published: 2021-02-15 04:10 – Updated: 2024-09-16 17:34
VLAI
Title
Null Dereference in SoapClient
Summary
In PHP versions 7.3.x below 7.3.27, 7.4.x below 7.4.15 and 8.0.x below 8.0.2, when using SOAP extension to connect to a SOAP server, a malicious SOAP server could return malformed XML data as a response that would cause PHP to access a null pointer and thus cause a crash.
Severity
5.3 (Medium)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
CWE
  • CWE-476 - NULL Pointer Dereference
Assigner
php
References
Impacted products
Vendor Product Version
PHP Group PHP Affected: 7.3.x , < 7.3.27 (custom)
Affected: 7.4.x , < 7.4.15 (custom)
Affected: 8.0.X , < 8.0.2 (custom)
Create a notification for this product.
Date Public
2021-02-01 00:00
Credits
Reported by jgalindo at datto dot com
Show details on NVD website
To clipboard 

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CVE-2021-21057 (GCVE-0-2021-21057)

Vulnerability from cvelistv5 – Published: 2021-02-11 19:42 – Updated: 2024-09-17 02:06
VLAI
Title
Acrobat Reader DC Invalid Memory Read Due To An Uninitialized Pointer
Summary
Acrobat Reader DC versions versions 2020.013.20074 (and earlier), 2020.001.30018 (and earlier) and 2017.011.30188 (and earlier) are affected by a null pointer dereference vulnerability when parsing a specially crafted PDF file. An unauthenticated attacker could leverage this vulnerability to achieve denial of service in the context of the current user. Exploitation of this issue requires user interaction in that a victim must open a malicious file.
Severity
6.6 (Medium)
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:H
CWE
  • CWE-476 - NULL Pointer Dereference (CWE-476)
Assigner
References
Impacted products
Vendor Product Version
Adobe Acrobat Reader Affected: unspecified , ≤ 2020.013.20074 (custom)
Affected: unspecified , ≤ 2020.001.30018 (custom)
Affected: unspecified , ≤ 2017.011.30188 (custom)
Affected: unspecified , ≤ None (custom)
Create a notification for this product.
Date Public
2021-02-09 00:00
Show details on NVD website
To clipboard 

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CVE-2021-20299 (GCVE-0-2021-20299)

Vulnerability from cvelistv5 – Published: 2022-03-16 00:00 – Updated: 2024-08-03 17:37
VLAI
Summary
A flaw was found in OpenEXR's Multipart input file functionality. A crafted multi-part input file with no actual parts can trigger a NULL pointer dereference. 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 OpenEXR Affected: Affected before v2.5.4
Show details on NVD website
To clipboard 

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CVE-2021-20296 (GCVE-0-2021-20296)

Vulnerability from cvelistv5 – Published: 2021-04-01 00:00 – Updated: 2024-08-03 17:37
VLAI
Summary
A flaw was found in OpenEXR in versions before 3.0.0-beta. A crafted input file supplied by an attacker, that is processed by the Dwa decompression functionality of OpenEXR's IlmImf library, could cause a NULL pointer dereference. 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 OpenEXR Affected: OpenEXR 3.0.0-beta
Show details on NVD website
To clipboard 

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CVE-2021-20274 (GCVE-0-2021-20274)

Vulnerability from cvelistv5 – Published: 2021-03-09 13:11 – Updated: 2024-08-03 17:37
VLAI
Summary
A flaw was found in privoxy before 3.0.32. A crash may occur due a NULL-pointer dereference when the socks server misbehaves.
Severity
No CVSS data available.
CWE
Assigner
References
Impacted products
Vendor Product Version
n/a privoxy Affected: privoxy 3.0.32
Show details on NVD website
To clipboard 

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CVE-2021-20213 (GCVE-0-2021-20213)

Vulnerability from cvelistv5 – Published: 2021-03-25 18:57 – Updated: 2024-08-03 17:30
VLAI
Summary
A flaw was found in Privoxy in versions before 3.0.29. Dereference of a NULL-pointer that could result in a crash if accept-intercepted-requests was enabled, Privoxy failed to get the request destination from the Host header and a memory allocation failed.
Severity
No CVSS data available.
CWE
Assigner
References
Impacted products
Vendor Product Version
n/a privoxy Affected: Privoxy 3.0.29
Show details on NVD website
To clipboard 

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CVE-2021-20196 (GCVE-0-2021-20196)

Vulnerability from cvelistv5 – Published: 2021-05-26 21:16 – Updated: 2024-08-03 17:30
VLAI
Summary
A NULL pointer dereference flaw was found in the floppy disk emulator of QEMU. This issue occurs while processing read/write ioport commands if the selected floppy drive is not initialized with a block device. 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.
Severity
No CVSS data available.
CWE
Assigner
References
Impacted products
Vendor Product Version
n/a qemu Affected: vulnerable up to (including) qemu 5.2.0
Show details on NVD website
To clipboard 

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CVE-2021-4217 (GCVE-0-2021-4217)

Vulnerability from cvelistv5 – Published: 2022-08-24 15:08 – Updated: 2024-08-03 17:16
VLAI
Summary
A flaw was found in unzip. The vulnerability occurs due to improper handling of Unicode strings, which can lead to a null pointer dereference. This flaw allows an attacker to input a specially crafted zip file, leading to a crash or code execution.
Severity
No CVSS data available.
CWE
  • CWE-476 - - NULL Pointer Dereference
Assigner
References
Impacted products
Vendor Product Version
n/a unzip Affected: unzip 6.0
Show details on NVD website
To clipboard 

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CVE-2021-4209 (GCVE-0-2021-4209)

Vulnerability from cvelistv5 – Published: 2022-08-24 15:07 – Updated: 2024-08-03 17:16
VLAI
Summary
A NULL pointer dereference flaw was found in GnuTLS. As Nettle's hash update functions internally call memcpy, providing zero-length input may cause undefined behavior. This flaw leads to a denial of service after authentication in rare circumstances.
Severity
No CVSS data available.
CWE
  • CWE-476 - - NULL Pointer Dereference
Assigner
References
Impacted products
Vendor Product Version
n/a GnuTLS Affected: Fixed in gnutls v3.7.3
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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