2021 Security Vulnerability Report
CVE Statistics for 2021

The average severity was 7.1 out of 10, which was about the same as in 2020.
Products & Vendors with the most security vulnerabilities published in 2021 Vulnerabilities may exist in multiple products or vendors

By Product
By Vendor
By Weakness
#1
XSS
The software does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users.#2
Memory Corruption
The software writes data past the end, or before the beginning, of the intended buffer. Typically, this can result in corruption of data, a crash, or code execution. The software may modify an index or perform pointer arithmetic that references a memory location that is outside of the boundaries of the buffer. A subsequent write operation then produces undefined or unexpected results.#3
SQL Injection
The software constructs all or part of an SQL command using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the intended SQL command when it is sent to a downstream component.#4
Out-of-bounds Read
The software reads data past the end, or before the beginning, of the intended buffer. Typically, this can allow attackers to read sensitive information from other memory locations or cause a crash. A crash can occur when the code reads a variable amount of data and assumes that a sentinel exists to stop the read operation, such as a NUL in a string. The expected sentinel might not be located in the out-of-bounds memory, causing excessive data to be read, leading to a segmentation fault or a buffer overflow. The software may modify an index or perform pointer arithmetic that references a memory location that is outside of the boundaries of the buffer. A subsequent read operation then produces undefined or unexpected results.#5
Directory traversal
The software uses external input to construct a pathname that is intended to identify a file or directory that is located underneath a restricted parent directory, but the software does not properly neutralize special elements within the pathname that can cause the pathname to resolve to a location that is outside of the restricted directory.#6
Dangling pointer
Referencing memory after it has been freed can cause a program to crash, use unexpected values, or execute code.#7
Improper Input Validation
The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly.#8
Session Riding
The web application does not, or can not, sufficiently verify whether a well-formed, valid, consistent request was intentionally provided by the user who submitted the request. When a web server is designed to receive a request from a client without any mechanism for verifying that it was intentionally sent, then it might be possible for an attacker to trick a client into making an unintentional request to the web server which will be treated as an authentic request. This can be done via a URL, image load, XMLHttpRequest, etc. and can result in exposure of data or unintended code execution.#9
Shell injection
The software constructs all or part of an OS command using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the intended OS command when it is sent to a downstream component.#10
Classic Buffer Overflow
The program copies an input buffer to an output buffer without verifying that the size of the input buffer is less than the size of the output buffer, leading to a buffer overflow. A buffer overflow condition exists when a program attempts to put more data in a buffer than it can hold, or when a program attempts to put data in a memory area outside of the boundaries of a buffer. The simplest type of error, and the most common cause of buffer overflows, is the "classic" case in which the program copies the buffer without restricting how much is copied. Other variants exist, but the existence of a classic overflow strongly suggests that the programmer is not considering even the most basic of security protections.#11
NULL Pointer Dereference
A NULL pointer dereference occurs when the application dereferences a pointer that it expects to be valid, but is NULL, typically causing a crash or exit. NULL pointer dereference issues can occur through a number of flaws, including race conditions, and simple programming omissions.#12
Command Injection
The software constructs all or part of a command using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the intended command when it is sent to a downstream component.#13
Improper Privilege Management
The software does not properly assign, modify, track, or check privileges for an actor, creating an unintended sphere of control for that actor.#14
AuthZ
The software performs an authorization check when an actor attempts to access a resource or perform an action, but it does not correctly perform the check. This allows attackers to bypass intended access restrictions.#15
authentification
When an actor claims to have a given identity, the software does not prove or insufficiently proves that the claim is correct.#16
Information Disclosure
The product exposes sensitive information to an actor that is not explicitly authorized to have access to that information.#17
Buffer Overflow
The software performs operations on a memory buffer, but it can read from or write to a memory location that is outside of the intended boundary of the buffer.#18
Unrestricted File Upload
The software allows the attacker to upload or transfer files of dangerous types that can be automatically processed within the product's environment.#19
AuthZ
The software does not perform an authorization check when an actor attempts to access a resource or perform an action.#20
Integer Overflow or Wraparound
The software performs a calculation that can produce an integer overflow or wraparound, when the logic assumes that the resulting value will always be larger than the original value. This can introduce other weaknesses when the calculation is used for resource management or execution control. An integer overflow or wraparound occurs when an integer value is incremented to a value that is too large to store in the associated representation. When this occurs, the value may wrap to become a very small or negative number. While this may be intended behavior in circumstances that rely on wrapping, it can have security consequences if the wrap is unexpected. This is especially the case if the integer overflow can be triggered using user-supplied inputs. This becomes security-critical when the result is used to control looping, make a security decision, or determine the offset or size in behaviors such as memory allocation, copying, concatenation, etc.#21
Marshaling, Unmarshaling
The application deserializes untrusted data without sufficiently verifying that the resulting data will be valid.#22
SSRF
The web server receives a URL or similar request from an upstream component and retrieves the contents of this URL, but it does not sufficiently ensure that the request is being sent to the expected destination. By providing URLs to unexpected hosts or ports, attackers can make it appear that the server is sending the request, possibly bypassing access controls such as firewalls that prevent the attackers from accessing the URLs directly. The server can be used as a proxy to conduct port scanning of hosts in internal networks, use other URLs such as that can access documents on the system (using file://), or use other protocols such as gopher:// or tftp://, which may provide greater control over the contents of requests.#23
Resource Exhaustion
The software does not properly control the allocation and maintenance of a limited resource, thereby enabling an actor to influence the amount of resources consumed, eventually leading to the exhaustion of available resources.#24
Use of Hard-coded Credentials
The software contains hard-coded credentials, such as a password or cryptographic key, which it uses for its own inbound authentication, outbound communication to external components, or encryption of internal data.#25
Incorrect Default Permissions
During installation, installed file permissions are set to allow anyone to modify those files.By Category
Fortinet FortiWeb
29 vulnerabilities in 2021
Fortinet FortiOS
14 vulnerabilities in 2021
Fortinet FortiManager
12 vulnerabilities in 2021
Content Management
Database
Oracle MySQL
124 vulnerabilities in 2021
MariaDB
15 vulnerabilities in 2021
Couchbase Server
11 vulnerabilities in 2021
Desktop Software
Mozilla Thunderbird
73 vulnerabilities in 2021
Microsoft Office
64 vulnerabilities in 2021
Microsoft Excel
28 vulnerabilities in 2021
Development Tools
Jenkins
29 vulnerabilities in 2021
Microsoft Visual Studio Code
19 vulnerabilities in 2021
Microsoft Visual Studio
6 vulnerabilities in 2021
DevOps
GitLab
156 vulnerabilities in 2021
Kubernetes
6 vulnerabilities in 2021
Docker
2 vulnerabilities in 2021
Microsoft Exchange Server
31 vulnerabilities in 2021
Exim
22 vulnerabilities in 2021
Firmware
Intel Core i5 Processor
2 vulnerabilities in 2021
Intel Core i7 Processor
2 vulnerabilities in 2021
Java Application Servers
Oracle Weblogic Server
44 vulnerabilities in 2021
Apache Tomcat
8 vulnerabilities in 2021
Eclipse Jetty
7 vulnerabilities in 2021
Java Libraries
FasterXML Jackson Databind
12 vulnerabilities in 2021
Libraries
Google Tensorflow
201 vulnerabilities in 2021
OpenSSL
8 vulnerabilities in 2021
Microsoft .NET Core
7 vulnerabilities in 2021
Operating Systems
Debian Linux
1071 vulnerabilities in 2021
Google Android
566 vulnerabilities in 2021
Microsoft Windows Server 2016
496 vulnerabilities in 2021
Runtime Environments
Oracle OpenJDK
20 vulnerabilities in 2021
GoLang Go
16 vulnerabilities in 2021
nodejs node.js
14 vulnerabilities in 2021
Server Software
Microsoft Sharepoint Server
48 vulnerabilities in 2021
Microsoft Sharepoint Enterprise Server
31 vulnerabilities in 2021
OpenBSD OpenSSH
3 vulnerabilities in 2021
Virtualization
Oracle VM VirtualBox
46 vulnerabilities in 2021
QEMU
26 vulnerabilities in 2021
Citrix Xen Desktop
1 vulnerability in 2021
Web Application Framework
Django Project Django
8 vulnerabilities in 2021
Microsoft ASP.NET Core
3 vulnerabilities in 2021
Laravel
1 vulnerability in 2021
Web Applications
Apple iCloud
12 vulnerabilities in 2021
Adobe Magento
1 vulnerability in 2021
Web Browsers
Google Chrome
308 vulnerabilities in 2021
Mozilla Firefox
123 vulnerabilities in 2021
Mozilla FireFox Extended Support Release (ESR)
59 vulnerabilities in 2021
Web Servers
Apache HTTP Server
17 vulnerabilities in 2021
2021 Known Exploited Vulnerabilities
These vulnerabilities may be considered some of the most dangerous vulnerabilities of 2021, because they are both known to have been exploited and have a high severity score. In fact 4 vulnerabilities scored the highest possible CVSS base score, of 10.

CVE-2021-22205 vulnerability in ExifTool, disclosed on April 23, 2021

CVE-2021-44228 vulnerability in Log4j2, disclosed on December 10, 2021

CVE-2021-35211 vulnerability in SolarWinds nServ-U, disclosed on July 14, 2021

CVE-2021-22893 vulnerability in Pulse Connect Secure, disclosed on April 23, 2021

CVE-2021-22986 vulnerability in BIG-IP, disclosed on March 31, 2021

CVE-2021-44529 vulnerability in Endpoint Manager Cloud Service Appliance (EPM CSA), disclosed on December 8, 2021

CVE-2021-22005 vulnerability in vCenter Server, disclosed on September 23, 2021

CVE-2021-26084 vulnerability in Confluence Server, disclosed on August 30, 2021

CVE-2021-36260 vulnerability in Security cameras web server, disclosed on September 22, 2021

CVE-2021-42013 vulnerability in HTTP Server, disclosed on October 7, 2021

CVE-2021-40539 vulnerability in ManageEngine ADSelfServicePlus, disclosed on September 7, 2021

CVE-2021-1497 vulnerability in HyperFlex HX, disclosed on May 6, 2021

CVE-2021-20090 vulnerability in Buffalo WSR-2533DHPL2 and WSR-2533DHP3 firmware, disclosed on April 29, 2021

CVE-2021-35464 vulnerability in Access Management server, disclosed on July 22, 2021

CVE-2021-42237 vulnerability in XP, disclosed on November 5, 2021

CVE-2021-21985 vulnerability in vCenter Server, disclosed on May 26, 2021

CVE-2021-38647 vulnerability in Microsoft Azure Open Management Infrastructure (OMI), disclosed on September 15, 2021

CVE-2021-44077 vulnerability in ManageEngine ServiceDesk Plus (SDP) / SupportCenter Plus, disclosed on November 29, 2021

CVE-2021-44515 vulnerability in Desktop Central, disclosed on December 12, 2021

CVE-2021-20038 vulnerability in SMA 100 Appliances, disclosed on December 8, 2021

CVE-2021-3129 vulnerability in Ignition, disclosed on January 12, 2021

CVE-2021-36380 vulnerability in SureLine, disclosed on August 13, 2021

CVE-2021-33044 vulnerability in IP Camera Firmware, disclosed on September 15, 2021

CVE-2021-31755 vulnerability in Tenda AC11 devices, disclosed on May 7, 2021

CVE-2021-40870 vulnerability in Aviatrix Controller, disclosed on September 13, 2021

CVE-2021-27561 vulnerability in Device Management Platform, disclosed on October 15, 2021

CVE-2021-1498 vulnerability in HyperFlex HX, disclosed on May 6, 2021

CVE-2021-22502 vulnerability in Micro Focus Operation Bridge Reporter (OBR), disclosed on February 8, 2021

CVE-2021-42258 vulnerability in BillQuick Web Suite, disclosed on October 22, 2021

CVE-2021-35394 vulnerability in Jungle Software Development Kit (SDK), disclosed on August 16, 2021

CVE-2020-25506 vulnerability in DNS-320, disclosed on February 2, 2021

CVE-2021-35395 vulnerability in Jungle Software Development Kit (SDK), disclosed on August 16, 2021

CVE-2021-33045 vulnerability in IP Camera Firmware, disclosed on September 15, 2021

CVE-2021-21972 vulnerability in vCenter Server, disclosed on February 24, 2021

CVE-2021-31166 vulnerability in HTTP Protocol Stack, disclosed on May 11, 2021

CVE-2020-29557 vulnerability in DIR-825 R1, disclosed on January 29, 2021

CVE-2021-37415 vulnerability in ManageEngine ServiceDesk Plus (SDP), disclosed on September 1, 2021

CVE-2021-28799 vulnerability in Network Attached Storage (NAS), disclosed on May 13, 2021

CVE-2021-22941 vulnerability in ShareFile, disclosed on September 23, 2021

CVE-2020-2509 vulnerability in QNAP Network-Attached Storage (NAS), disclosed on April 17, 2021

CVE-2021-20028 vulnerability in Secure Remote Access (SRA), disclosed on August 4, 2021

CVE-2021-20021 vulnerability in SonicWall Email Security, disclosed on April 9, 2021

CVE-2021-20016 vulnerability in SonicWall SSLVPN SMA100, disclosed on February 4, 2021

CVE-2021-44026 vulnerability in Roundcube Webmail, disclosed on November 19, 2021

CVE-2021-22991 vulnerability in BIG-IP Traffic Management Microkernel, disclosed on March 31, 2021

CVE-2020-2506 vulnerability in Helpdesk, disclosed on February 3, 2021

CVE-2021-27852 vulnerability in Checkbox Survey, disclosed on May 27, 2021

CVE-2021-30116 vulnerability in Kaseya VSA, disclosed on July 9, 2021

CVE-2021-27103 vulnerability in FTA, disclosed on February 16, 2021

CVE-2021-27104 vulnerability in FTA, disclosed on February 16, 2021

CVE-2021-27101 vulnerability in FTA, disclosed on February 16, 2021

CVE-2021-1871 vulnerability in iOS, disclosed on April 2, 2021

CVE-2021-27877 vulnerability in Backup Exec Agent, disclosed on March 1, 2021

CVE-2021-1870 vulnerability in iOS, disclosed on April 2, 2021

CVE-2021-30633 vulnerability in Chrome, disclosed on October 8, 2021

CVE-2020-16017 vulnerability in Chrome, disclosed on January 8, 2021

CVE-2021-37973 vulnerability in Chrome, disclosed on October 8, 2021

CVE-2021-34473 vulnerability in Microsoft Exchange Server, disclosed on July 14, 2021

CVE-2021-26855 vulnerability in Microsoft Exchange Server, disclosed on March 3, 2021

CVE-2021-32648 vulnerability in October CMS, disclosed on August 26, 2021

CVE-2021-40438 vulnerability in Apache, disclosed on September 16, 2021

CVE-2021-45046 vulnerability in Log4j2, disclosed on December 14, 2021

CVE-2021-34523 vulnerability in Microsoft Exchange Server, disclosed on July 14, 2021

CVE-2021-40444 vulnerability in Microsoft MSHTML, disclosed on September 15, 2021

CVE-2021-34527 vulnerability in Windows, disclosed on July 2, 2021

CVE-2021-42321 vulnerability in Exchange, disclosed on November 10, 2021

CVE-2021-25296 vulnerability in Nagios XI, disclosed on February 15, 2021

CVE-2021-21220 vulnerability in Chromium V8 Engine, disclosed on April 26, 2021

CVE-2021-21017 vulnerability in Acrobat and Reader, disclosed on February 11, 2021

CVE-2021-26411 vulnerability in Microsoft Edge, Internet Explorer, disclosed on March 11, 2021

CVE-2021-38163 vulnerability in NetWeaver, disclosed on September 14, 2021

CVE-2021-30632 vulnerability in Chrome, disclosed on October 8, 2021

CVE-2021-25298 vulnerability in Nagios XI, disclosed on February 15, 2021

CVE-2021-30551 vulnerability in Chromium V8 Engine, disclosed on June 15, 2021

CVE-2021-38003 vulnerability in Chromium V8 Engine, disclosed on November 23, 2021

CVE-2021-21224 vulnerability in Chromium V8 Engine, disclosed on April 26, 2021

CVE-2021-37975 vulnerability in Chrome, disclosed on October 8, 2021

CVE-2021-25297 vulnerability in Nagios XI, disclosed on February 15, 2021

CVE-2021-22894 vulnerability in Pulse Connect Secure, disclosed on May 27, 2021

CVE-2021-27860 vulnerability in WARP, IPVPN, and MPVPN software, disclosed on December 8, 2021

CVE-2021-21166 vulnerability in Chrome, disclosed on March 9, 2021

CVE-2021-21148 vulnerability in Chromium V8 Engine, disclosed on February 9, 2021

CVE-2020-16013 vulnerability in Chromium V8 Engine, disclosed on January 8, 2021

CVE-2021-21206 vulnerability in Chromium Blink, disclosed on April 26, 2021

CVE-2021-28550 vulnerability in Acrobat and Reader, disclosed on September 2, 2021

CVE-2021-22899 vulnerability in Pulse Connect Secure, disclosed on May 27, 2021

CVE-2020-6572 vulnerability in Chrome, disclosed on January 14, 2021

CVE-2021-30554 vulnerability in Chrome, disclosed on July 2, 2021

CVE-2021-21193 vulnerability in Chromium V8 Engine, disclosed on March 16, 2021

CVE-2021-30563 vulnerability in Chrome, disclosed on August 3, 2021

CVE-2021-28663 vulnerability in Mali Graphics Processing Unit (GPU), disclosed on May 10, 2021

CVE-2021-27085 vulnerability in Internet Explorer, disclosed on March 11, 2021

CVE-2021-36741 vulnerability in Trend Micro Multiple Products, disclosed on July 29, 2021

CVE-2021-30858 vulnerability in iOS and iPadOS, disclosed on August 24, 2021

CVE-2021-27878 vulnerability in Backup Exec Agent, disclosed on March 1, 2021

CVE-2021-29256 vulnerability in Mali Graphics Processing Unit (GPU), disclosed on May 24, 2021

CVE-2021-30666 vulnerability in iOS, disclosed on September 8, 2021

CVE-2021-30665 vulnerability in Safari, disclosed on September 8, 2021

CVE-2021-30761 vulnerability in iOS, disclosed on September 8, 2021

CVE-2021-28664 vulnerability in Mali Graphics Processing Unit (GPU), disclosed on May 10, 2021
Report Last Updated: May 21, 2025
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