CISA Known Exploited Vulnerabilities (KEV)
CISA's Known Exploited Vulnerabilities (KEV) catalog is the authoritative list of security flaws that have been confirmed exploited in real-world attacks. CVEFeed.io mirrors every entry, joins it to full CVE and severity data, and tracks new additions so you can prioritize remediation the moment a vulnerability enters the catalog.
Because each KEV entry carries direct evidence of active exploitation, the catalog is one of the highest-signal inputs for risk-based patch management — start here before triaging vulnerabilities that are only theoretically exploitable.
7.8
CVE-2020-1147 - Microsoft .NET Framework, SharePoint, and Visual Studio Remote Code Execution Vulnerability -
Action Due May 03, 2022 Target Vendor : Microsoft
Description :Microsoft .NET Framework, Microsoft SharePoint, and Visual Studio contain a remote code execution vulnerability when the software fails to check the source markup of XML file input. Successful exploitation allows an attacker to execute code in the context of the process responsible for deserialization of the XML content.
Action :Apply updates per vendor instructions.
Known To Be Used in Ransomware Campaigns? : Unknown
Notes :https://nvd.nist.gov/vuln/detail/CVE-2020-1147
8.1
CVE-2017-9805 - Apache Struts Deserialization of Untrusted Data Vulnerability -
Action Due May 03, 2022 Target Vendor : Apache
Description :Apache Struts REST Plugin uses an XStreamHandler with an instance of XStream for deserialization without any type filtering, which can lead to remote code execution when deserializing XML payloads.
Action :Apply updates per vendor instructions.
Known To Be Used in Ransomware Campaigns? : Unknown
Notes :https://nvd.nist.gov/vuln/detail/CVE-2017-9805
9.8
CVE-2021-42013 - Apache HTTP Server Path Traversal Vulnerability -
Action Due Nov 17, 2021 Target Vendor : Apache
Description :Apache HTTP Server contains a path traversal vulnerability that allows an attacker to perform remote code execution if files outside directories configured by Alias-like directives are not under default require all denied or if CGI scripts are enabled. This CVE ID resolves an incomplete patch for CVE-2021-41773.
Action :Apply updates per vendor instructions.
Known To Be Used in Ransomware Campaigns? : Known Detected Nov 03, 2021
Notes :https://nvd.nist.gov/vuln/detail/CVE-2021-42013
9.8
CVE-2021-41773 - Apache HTTP Server Path Traversal Vulnerability -
Action Due Nov 17, 2021 Target Vendor : Apache
Description :Apache HTTP Server contains a path traversal vulnerability that allows an attacker to perform remote code execution if files outside directories configured by Alias-like directives are not under default �require all denied� or if CGI scripts are enabled. The original patch issued under this CVE ID is insufficient, please review remediation information under CVE-2021-42013.
Action :Apply updates per vendor instructions.
Known To Be Used in Ransomware Campaigns? : Known Detected Nov 03, 2021
Notes :https://nvd.nist.gov/vuln/detail/CVE-2021-41773
7.8
CVE-2019-0211 - Apache HTTP Server Privilege Escalation Vulnerability -
Action Due May 03, 2022 Target Vendor : Apache
Description :Apache HTTP Server, with MPM event, worker or prefork, code executing in less-privileged child processes or threads (including scripts executed by an in-process scripting interpreter) could execute code with the privileges of the parent process (usually root) by manipulating the scoreboard.
Action :Apply updates per vendor instructions.
Known To Be Used in Ransomware Campaigns? : Unknown
Notes :https://nvd.nist.gov/vuln/detail/CVE-2019-0211
6.1
CVE-2021-1879 - Apple iOS, iPadOS, and watchOS WebKit Cross-Site Scripting (XSS) Vulnerability -
Action Due Nov 17, 2021 Target Vendor : Apple
Description :Apple iOS, iPadOS, and watchOS WebKit contain an unspecified vulnerability that allows for universal cross-site scripting (XSS) when processing maliciously crafted web content. This vulnerability could impact HTML parsers that use WebKit, including but not limited to Apple Safari and non-Apple products which rely on WebKit for HTML processing.
Action :Apply updates per vendor instructions.
Known To Be Used in Ransomware Campaigns? : Unknown
Notes :https://nvd.nist.gov/vuln/detail/CVE-2021-1879
9.8
CVE-2019-11580 - Atlassian Crowd and Crowd Data Center Remote Code Execution Vulnerability -
Action Due May 03, 2022 Target Vendor : Atlassian
Description :Atlassian Crowd and Crowd Data Center contain a remote code execution vulnerability resulting from a pdkinstall development plugin being incorrectly enabled in release builds.
Action :Apply updates per vendor instructions.
Known To Be Used in Ransomware Campaigns? : Known Detected Feb 26, 2026
Notes :https://nvd.nist.gov/vuln/detail/CVE-2019-11580
10.0
CVE-2019-3396 - Atlassian Confluence Server and Data Center Server-Side Template Injection Vulnerability -
Action Due May 03, 2022 Target Vendor : Atlassian
Description :Atlassian Confluence Server and Data Center contain a server-side template injection vulnerability that may allow an attacker to achieve path traversal and remote code execution.
Action :Apply updates per vendor instructions.
Known To Be Used in Ransomware Campaigns? : Known Detected Nov 03, 2021
Notes :https://nvd.nist.gov/vuln/detail/CVE-2019-3396
9.8
CVE-2021-42258 - BQE BillQuick Web Suite SQL Injection Vulnerability -
Action Due Nov 17, 2021 Target Vendor : BQE
Description :BQE BillQuick Web Suite contains an SQL injection vulnerability when accessing the username parameter that may allow for unauthenticated, remote code execution.
Action :Apply updates per vendor instructions.
Known To Be Used in Ransomware Campaigns? : Known Detected Nov 03, 2021
Notes :https://nvd.nist.gov/vuln/detail/CVE-2021-42258
10.0
CVE-2021-1497 - Cisco HyperFlex HX Installer Virtual Machine Command Injection Vulnerability -
Action Due Nov 17, 2021 Target Vendor : Cisco
Description :Cisco HyperFlex HX Installer Virtual Machine contains an insufficient input validation vulnerability which could allow an attacker to execute commands on an affected device as the root user.
Action :Apply updates per vendor instructions.
Known To Be Used in Ransomware Campaigns? : Unknown
Notes :https://nvd.nist.gov/vuln/detail/CVE-2021-1497
9.8
CVE-2016-4437 - Apache Shiro Code Execution Vulnerability -
Action Due May 03, 2022 Target Vendor : Apache
Description :Apache Shiro contains a vulnerability which may allow remote attackers to execute code or bypass intended access restrictions via an unspecified request parameter when a cipher key has not been configured for the "remember me" feature.
Action :Apply updates per vendor instructions.
Known To Be Used in Ransomware Campaigns? : Unknown
Notes :https://nvd.nist.gov/vuln/detail/CVE-2016-4437
10.0
CVE-2020-29583 - Zyxel Multiple Products Use of Hard-Coded Credentials Vulnerability -
Action Due May 03, 2022 Target Vendor : Zyxel
Description :Zyxel firewalls (ATP, USG, VM) and AP Controllers (NXC2500 and NXC5500) contain a use of hard-coded credentials vulnerability in an undocumented account ("zyfwp") with an unchangeable password.
Action :Apply updates per vendor instructions.
Known To Be Used in Ransomware Campaigns? : Unknown
Notes :https://nvd.nist.gov/vuln/detail/CVE-2020-29583
4.3
CVE-2020-9819 - Apple iOS, iPadOS, and watchOS Memory Corruption Vulnerability -
Action Due May 03, 2022 Target Vendor : Apple
Description :Apple iOS, iPadOS, and watchOS Mail contains a memory corruption vulnerability that may allow heap corruption when processing a maliciously crafted mail message.
Action :Apply updates per vendor instructions.
Known To Be Used in Ransomware Campaigns? : Unknown
Notes :https://nvd.nist.gov/vuln/detail/CVE-2020-9819
8.8
CVE-2021-30762 - Apple iOS WebKit Use-After-Free Vulnerability -
Action Due Nov 17, 2021 Target Vendor : Apple
Description :Apple iOS WebKit contains a use-after-free vulnerability that leads to code execution when processing maliciously crafted web content. This vulnerability could impact HTML parsers that use WebKit, including but not limited to Apple Safari and non-Apple products which rely on WebKit for HTML processing.
Action :Apply updates per vendor instructions.
Known To Be Used in Ransomware Campaigns? : Unknown
Notes :https://nvd.nist.gov/vuln/detail/CVE-2021-30762
8.8
CVE-2021-21148 - Google Chromium V8 Heap Buffer Overflow Vulnerability -
Action Due Nov 17, 2021 Target Vendor : Google
Description :Google Chromium V8 Engine contains a heap buffer overflow vulnerability that allows a remote attacker to potentially exploit heap corruption via a crafted HTML page. This vulnerability could affect multiple web browsers that utilize Chromium, including, but not limited to, Google Chrome, Microsoft Edge, and Opera.
Action :Apply updates per vendor instructions.
Known To Be Used in Ransomware Campaigns? : Unknown
Notes :https://nvd.nist.gov/vuln/detail/CVE-2021-21148
6.6
CVE-2021-31207 - Microsoft Exchange Server Security Feature Bypass Vulnerability -
Action Due Nov 17, 2021 Target Vendor : Microsoft
Description :Microsoft Exchange Server contains an unspecified vulnerability that allows for security feature bypass.
Action :Apply updates per vendor instructions.
Known To Be Used in Ransomware Campaigns? : Known Detected Nov 03, 2021
Notes :https://nvd.nist.gov/vuln/detail/CVE-2021-31207
9.8
CVE-2021-20090 - Arcadyan Buffalo Firmware Path Traversal Vulnerability -
Action Due Nov 17, 2021 Target Vendor : Arcadyan
Description :Arcadyan Buffalo firmware contains a path traversal vulnerability that could allow unauthenticated, remote attackers to bypass authentication and access sensitive information. This vulnerability affects multiple routers across several different vendors.
Action :Apply updates per vendor instructions.
Known To Be Used in Ransomware Campaigns? : Unknown
Notes :https://nvd.nist.gov/vuln/detail/CVE-2021-20090
5.5
CVE-2021-27562 - Arm Trusted Firmware Out-of-Bounds Write Vulnerability -
Action Due Nov 17, 2021 Target Vendor : Arm
Description :Arm Trusted Firmware contains an out-of-bounds write vulnerability allowing the non-secure (NS) world to trigger a system halt, overwrite secure data, or print out secure data when calling secure functions under the non-secure processing environment (NSPE) handler mode. This vulnerability affects Yealink Device Management servers.
Action :Apply updates per vendor instructions.
Known To Be Used in Ransomware Campaigns? : Unknown
Notes :https://nvd.nist.gov/vuln/detail/CVE-2021-27562
7.5
CVE-2018-0296 - Cisco Adaptive Security Appliance (ASA) Denial-of-Service Vulnerability -
Action Due May 03, 2022 Target Vendor : Cisco
Description :Cisco Adaptive Security Appliance (ASA) contains an improper input validation vulnerability with HTTP URLs. Exploitation could allow an attacker to cause a denial-of-service (DoS) condition or information disclosure.
Action :Apply updates per vendor instructions.
Known To Be Used in Ransomware Campaigns? : Unknown
Notes :https://nvd.nist.gov/vuln/detail/CVE-2018-0296
7.5
CVE-2019-13608 - Citrix StoreFront Server XML External Entity (XXE) Processing Vulnerability -
Action Due May 03, 2022 Target Vendor : Citrix
Description :Citrix StoreFront Server contains an XML External Entity (XXE) processing vulnerability that may allow an unauthenticated attacker to retrieve potentially sensitive information.
Action :Apply updates per vendor instructions.
Known To Be Used in Ransomware Campaigns? : Known Detected Nov 03, 2021
Notes :https://nvd.nist.gov/vuln/detail/CVE-2019-13608