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December 2021

Vulnerabilities first published in this month (UTC), newest first.

← November 2021 2021 / December January 2022 →
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  9. 954
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All Critical High Medium Low Exploited only Public exploit

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  • High 7.5
    CVE-2021-22054 Exploited Public exploit EPSS 100%

    VMware Workspace ONE UEM console 20.0.8 prior to 20.0.8.37, 20.11.0 prior to 20.11.0.40, 21.2.0 prior to 21.2.0.27, and…

    KEV Mar 9, 2026
  • High 7.8
    CVE-2021-43226 Exploited · Ransomware Public exploit

    Windows Common Log File System Driver Elevation of Privilege Vulnerability

    Windows Common Log File System Driver Elevation of Privilege Vulnerability

    Microsoft Windows Server 2019 Windows Server 2019 (Server Core installation) Windows 10 Version 1809 Windows
    KEV Oct 6, 2025
  • Critical 9.0
    CVE-2021-45046 Exploited · Ransomware Public exploit EPSS 100%

    Apache Log4j2 Thread Context Message Pattern and Context Lookup Pattern vulnerable to a denial of service attack

    It was found that the fix to address CVE-2021-44228 in Apache Log4j 2.15.0 was incomplete in certain non-default configurations. This could allows attackers with control over Thread Context Map (MDC) input data when the logging configuration uses a non-defaul…

    Apache Software Foundation Apache Log4j apache-log4j2 org.apache.logging.log4j:log4j-core Debian Ubuntu Maven
    KEV May 1, 2023
  • Critical 10.0
    CVE-2021-44228 Exploited · Ransomware Public exploit EPSS 100%

    Apache Log4j2 JNDI features do not protect against attacker controlled LDAP and other JNDI related endpoints

    Apache Log4j2 2.0-beta9 through 2.15.0 (excluding security releases 2.12.2, 2.12.3, and 2.3.1) JNDI features used in configuration, log messages, and parameters do not protect against attacker controlled LDAP and other JNDI related endpoints. An attacker who …

    Apache Software Foundation Apache Log4j2 apache-log4j2 org.apache.logging.log4j:log4j-core Debian Ubuntu Maven
    KEV Dec 10, 2021
  • Critical 9.8
    CVE-2021-20038 Exploited · Ransomware Public exploit EPSS 100%

    A Stack-based buffer overflow vulnerability in SMA100 Apache httpd server's mod_cgi module environment variables allows…

    SonicWall SonicWall SMA100 Network devices
    KEV Jan 28, 2022
  • Critical 9.8
    CVE-2021-44529 Exploited · Ransomware Public exploit EPSS 99%

    A code injection vulnerability in the Ivanti EPM Cloud Services Appliance (CSA) allows an unauthenticated user to execu…

    KEV Mar 25, 2024
  • High 7.5
    CVE-2021-43798 Exploited Public exploit EPSS 89%

    Grafana path traversal

    Grafana is an open-source platform for monitoring and observability. Grafana versions 8.0.0-beta1 through 8.3.0 (except for patched versions) iss vulnerable to directory traversal, allowing access to local files. The vulnerable URL path is: `<grafana_host_url…

    Grafana Grafana github.com/grafana/grafana grafana Web / CMS Alpine Go
    KEV Oct 9, 2025
  • High 8.1
    CVE-2021-23758 Exploited Public exploit EPSS 83%

    Deserialization of Untrusted Data

    All versions of package ajaxpro.2 are vulnerable to Deserialization of Untrusted Data due to the possibility of deserialization of arbitrary .NET classes, which can be abused to gain remote code execution.

    AjaxNetProfessional NuGet
    KEV Aug 26, 2026