Nation-state APTs also commonly exploited CVE-2020-15505 and CVE-2020-5902. Actors can exploit the vulnerability to steal the unencrypted credentials for all users on a compromised Pulse VPN server and retain unauthorized credentials for all users on a compromised Pulse VPN server and can retain unauthorize access after the system is patched unless all compromised credentials are changed. The CVE-2019-11510 vulnerability in Pulse Connect Secure VPN was also frequently targeted by nation-state APTs. Identified as emerging targets in early 2020, unremediated instances of CVE-2019-19781 and CVE-2019-11510 continued to be exploited throughout the year by nation-state advanced persistent threat actors (APTs) who leveraged these and other vulnerabilities, such as CVE-2018-13379, in VPN services to compromise an array of organizations, including those involved in COVID-19 vaccine development. Nation-state and criminal cyber actors most likely favor using this vulnerability because it is easy to exploit, Citrix servers are widespread, and exploitation enables the actors to perform unauthorized RCE on a target system. Government technical analysis.CVE-2019-19781 is a recently disclosed critical vulnerability in Citrix’s Application Delivery Controller (ADC)-a load balancing application for web, application, and database servers widely use throughout the United States. Among these vulnerabilities, CVE-2019-19781 was the most exploited flaw in 2020, according to U.S.
INTERNET LOCK 6.0.4 KEY HOW TO
See the Contact Information section below for how to reach CISA to report an incident or request technical assistance. Organizations that have not remediated these vulnerabilities should investigate for the presence of IOCs and, if compromised, initiate incident response and recovery plans. Most can be remediated by patching and updating systems. Organizations are encouraged to remediate or mitigate vulnerabilities as quickly as possible to reduce the risk of exploitation. Adversaries’ use of known vulnerabilities complicates attribution, reduces costs, and minimizes risk because they are not investing in developing a zero-day exploit for their exclusive use, which they risk losing if it becomes known. Malicious cyber actors will most likely continue to use older known vulnerabilities, such as CVE-2017-11882 affecting Microsoft Office, as long as they remain effective and systems remain unpatched. Among those highly exploited in 2021 are vulnerabilities in Microsoft, Pulse, Accellion, VMware, and Fortinet.ĬISA, ACSC, the NCSC, and FBI assess that public and private organizations worldwide remain vulnerable to compromise from the exploitation of these CVEs. In 2021, malicious cyber actors continued to target vulnerabilities in perimeter-type devices.
Table 1:Top Routinely Exploited CVEs in 2020
INTERNET LOCK 6.0.4 KEY PATCH
Many VPN gateway devices remained unpatched during 2020, with the growth of remote work options challenging the ability of organizations to conduct rigorous patch management.ĬISA, ACSC, the NCSC, and FBI consider the vulnerabilities listed in table 1 to be the topmost regularly exploited CVEs by cyber actors during 2020.
INTERNET LOCK 6.0.4 KEY SOFTWARE
The rapid shift and increased use of remote work options, such as virtual private networks (VPNs) and cloud-based environments, likely placed additional burden on cyber defenders struggling to maintain and keep pace with routine software patching.įour of the most targeted vulnerabilities in 2020 affected remote work, VPNs, or cloud-based technologies. Cyber actor exploitation of more recently disclosed software flaws in 2020 probably stems, in part, from the expansion of remote work options amid the COVID-19 pandemic.
Government, a majority of the top vulnerabilities targeted in 2020 were disclosed during the past two years. In 2020, cyber actors readily exploited recently disclosed vulnerabilities to compromise unpatched systems.
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