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TL;DR – 

The following cybersecurity agencies coauthored this joint Cybersecurity Advisory (CSA):

  • United States: The Cybersecurity and Infrastructure Security Agency (CISA), National Security
    Agency (NSA), and Federal Bureau of Investigation (FBI)
  • Australia: Australian Signals Directorate’s Australian Cyber Security Centre (ACSC)
  • Canada: Canadian Centre for Cyber Security (CCCS)
  • New Zealand: New Zealand National Cyber Security Centre (NCSC-NZ) and Computer
    Emergency Response Team New Zealand (CERT NZ)
  • United Kingdom: National Cyber Security Centre (NCSC-UK)

This advisory provides details on the Common Vulnerabilities and Exposures (CVEs) routinely and frequently exploited by malicious cyber actors in 2022 and the associated Common Weakness Enumeration(s) (CWE). In 2022, malicious cyber actors exploited older software vulnerabilities more frequently than recently disclosed vulnerabilities and targeted unpatched, internet-facing systems. 

Technical Details and Key Findings

Key Findings

In 2022, malicious cyber actors exploited older software vulnerabilities more frequently than recently disclosed vulnerabilities and targeted unpatched, internet-facing systems. Proof of concept (PoC) code was publicly available for many of the software vulnerabilities or vulnerability chains, likely facilitating exploitation by a broader range of malicious cyber actors.

Malicious cyber actors generally have the most success exploiting known vulnerabilities within the first two years of public disclosure—the value of such vulnerabilities gradually decreases as software is patched or upgraded. Timely patching reduces the effectiveness of known, exploitable vulnerabilities, possibly decreasing the pace of malicious cyber actor operations and forcing pursuit of more costly and time-consuming methods (such as developing zero-day exploits or conducting software supply chain operations).

Malicious cyber actors likely prioritize developing exploits for severe and globally prevalent CVEs. While sophisticated actors also develop tools to exploit other vulnerabilities, developing exploits for critical, wide-spread, and publicly known vulnerabilities gives actors low-cost, high-impact tools they can use for several years. Additionally, cyber actors likely give higher priority to vulnerabilities that are more prevalent in their specific targets’ networks. Multiple CVE or CVE chains require the actor to send a malicious web request to the vulnerable device, which often includes unique signatures that can be detected through deep packet inspection.

Top Routinely Exploited Vulnerabilities
The top 12 vulnerabilities the co-authors observed malicious cyber actors routinely
exploiting in 2022:

  • CVE-2018-13379. This vulnerability, affecting Fortinet SSL VPNs, was also routinely exploited in 2020 and 2021. The continued exploitation indicates that many organizations failed to patch software in a timely manner and remain vulnerable to malicious cyber actors.
  • CVE-2021-34473, CVE-2021-31207, CVE-2021-34523. These vulnerabilities, known as ProxyShell, affect Microsoft Exchange email servers. In combination, successful exploitation enables a remote actor to execute arbitrary code. These vulnerabilities reside within the Microsoft Client Access Service (CAS), which typically runs on port 443 in Microsoft Internet Information Services (IIS) (e.g., Microsoft’s web server). CAS is commonly exposed to the internet to enable users to access their email via mobile devices and web browsers.
  • CVE-2021-40539. This vulnerability enables unauthenticated remote code execution (RCE) in Zoho ManageEngine ADSelfService Plus and was linked to the usage of an outdated third-party dependency. Initial exploitation of this vulnerability began in late 2021 and continued throughout 2022.
  • CVE-2021-26084. This vulnerability, affecting Atlassian Confluence Server and Data Center (a web-based collaboration tool used by governments and private companies) could enable an unauthenticated cyber actor to execute arbitrary code on vulnerable systems. This vulnerability quickly became one of the most routinely exploited vulnerabilities after a PoC was released within a week of its disclosure. Attempted mass exploitation of this vulnerability was observed in September 2021.
  • CVE-2021- 44228. This vulnerability, known as Log4Shell, affects Apache’s Log4j library, an open-source logging framework incorporated into thousands of products worldwide. An actor can exploit this vulnerability by submitting a specially crafted request to a vulnerable system, causing the execution of arbitrary code. The request allows a cyber actor to take full control of a system. The actor can then steal information, launch ransomware, or conduct other malicious activity.[1] Malicious cyber actors began exploiting the
    vulnerability after it was publicly disclosed in December 2021, and continued to show high interest in CVE-2021- 44228 through the first half of 2022.
  • CVE-2022-22954, CVE-2022-22960. These vulnerabilities allow RCE, privilege escalation, and authentication bypass in VMware Workspace ONE Access, Identity Manager, and other VMware products. A malicious cyber actor with network access could trigger a
    server-side template injection that may result in remote code execution. Exploitation of CVE-2022-22954 and CVE-2022-22960 began in early 2022 and attempts continued throughout the remainder of the year.
  • CVE-2022-1388. This vulnerability allows unauthenticated malicious cyber actors to bypass iControl REST authentication on F5 BIG-IP application delivery and security software.
  • CVE-2022-30190. This vulnerability impacts the Microsoft Support Diagnostic Tool (MSDT) in Windows. A remote, unauthenticated cyber actor could exploit this vulnerability to take control of an affected system.
  • CVE-2022-26134. This critical RCE vulnerability affects Atlassian Confluence and Data Center. The vulnerability, which was likely initially exploited as a zero-day before public disclosure in June 2022, is related to an older Confluence vulnerability (CVE-2021-26084), which cyber actors also exploited in 2022.

Read the full advisory details on the Common Vulnerabilities and Exposures.

Vulnerability and Configuration Management

  • Update software, operating systems, applications, and firmware on IT network assets in a timely manner. Prioritize patching known exploited vulnerabilities, especially those CVEs identified in this CSA, then critical and high vulnerabilities that allow for remote code execution or denial-of-service on internet-facing equipment. For patch information on CVEs identified in this CSA, refer to the appendix.
    • If a patch for a known exploited or critical vulnerability cannot be quickly applied, implement vendor-approved workarounds.
    • Replace end-of-life software (i.e., software no longer supported by the vendor).
  • Routinely perform automated asset discovery across the entire estate to identify and catalogue all the systems, services, hardware and software.
  • Implement a robust patch management process and centralized patch management system that establishes prioritization of patch applications.
  • Document secure baseline configurations for all IT/OT components, including cloud infrastructure. Monitor, examine, and document any deviations from the initial secure baseline.
  • Perform regular secure system backups and create known good copies of all device configurations for repairs and/or restoration. Store copies off-network in physically secure locations and test regularly.
  • Maintain an updated cybersecurity incident response plan that is tested at least annually and updated within a risk informed time frame to ensure its effectiveness.

Read the full advisory on

CISA Cybersecurity Advisory – August 3, 2023 []

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