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May 2021

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

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All Critical High Medium Low Exploited only Public exploit

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  • Critical 9.8
    CVE-2021-27852 Exploited EPSS 30%

    Deserialization of Untrusted Data vulnerability in CheckboxWeb.dll of Checkbox Survey allows an unauthenticated remote …

    Checkbox Survey
    KEV Apr 11, 2022
  • Critical 9.8
    CVE-2021-21985 Exploited · Ransomware Public exploit Scanner template EPSS 100%

    The vSphere Client (HTML5) contains a remote code execution vulnerability due to lack of input validation in the Virtua…

    Virtualization
    KEV Nov 3, 2021
  • Critical 10.0
    CVE-2021-28799 Exploited · Ransomware Scanner template EPSS 78%

    Improper Authorization Vulnerability in HBS 3 (Hybrid Backup Sync)

    An improper authorization vulnerability has been reported to affect QNAP NAS running HBS 3 (Hybrid Backup Sync. ) If exploited, the vulnerability allows remote attackers to log in to a device. This issue affects: QNAP Systems Inc. HBS 3 versions prior to v16.…

    QNAP Systems HBS 3 HBS 1.3 HBS 2
    KEV Mar 31, 2022
  • Critical 9.8
    CVE-2021-31166 Exploited Public exploit EPSS 100%

    HTTP Protocol Stack Remote Code Execution Vulnerability

    HTTP Protocol Stack Remote Code Execution Vulnerability

    Microsoft Windows 10 Version 20H2 Windows Server version 20H2 Windows 10 Version 2004 Windows
    KEV Apr 6, 2022
  • Critical 9.8
    CVE-2021-31755 Exploited Scanner template EPSS 87%

    An issue was discovered on Tenda AC11 devices with firmware through 02.03.01.104_CN. A stack buffer overflow vulnerabil…

    KEV Nov 3, 2021
  • Critical 9.8
    CVE-2021-32030 Exploited Scanner template EPSS 99%

    The administrator application on ASUS GT-AC2900 devices before 3.0.0.4.386.42643 and Lyra Mini before 3.0.0.4_384_46630…

    KEV Jun 2, 2025
  • Critical 9.8
    CVE-2021-1498 Exploited Public exploit Scanner template EPSS 100%

    Cisco HyperFlex HX Command Injection Vulnerabilities

    Multiple vulnerabilities in the web-based management interface of Cisco HyperFlex HX could allow an unauthenticated, remote attacker to perform command injection attacks against an affected device. For more information about these vulnerabilities, see the Det…

    Cisco Cisco HyperFlex HX Data Platform Network devices
    KEV Nov 3, 2021
  • Critical 9.8
    CVE-2021-1497 Exploited Public exploit Scanner template EPSS 100%

    Cisco HyperFlex HX Command Injection Vulnerabilities

    Multiple vulnerabilities in the web-based management interface of Cisco HyperFlex HX could allow an unauthenticated, remote attacker to perform command injection attacks against an affected device. For more information about these vulnerabilities, see the Det…

    Cisco Cisco HyperFlex HX Data Platform Network devices
    KEV Nov 3, 2021