In collaboration with CISA, the NSA, and the FBI, Five Eyes cybersecurity authorities have issued today a list of the 12 most exploited vulnerabilities throughout 2022.

Cybersecurity agencies in the United States, Australia, Canada, New Zealand, and the United Kingdom called on organizations worldwide to address these security flaws and deploy patch management systems to minimize their exposure to potential attacks.

Threat actors increasingly focused their attacks on outdated software vulnerabilities rather than recently disclosed ones during the previous year, specifically targeting systems left unpatched and exposed on the Internet.

“In 2022, malicious cyber actors exploited older software vulnerabilities more frequently than recently disclosed vulnerabilities and targeted unpatched, internet-facing systems,” the joint advisory reads.

“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.”

While the Common Vulnerabilities and Exposures (CVE) Program published over 25,000 new security vulnerabilities until the end of 2022, only five vulnerabilities made it to the list of the top 12 flaws exploited in attacks the same year.

Below is the list of the 12 most exploited security flaws last year and relevant links to the National Vulnerability Database entries.

The first spot goes to CVE-2018-13379, a Fortinet SSL VPN vulnerability the company fixed four years ago, in May 2019. The bug was abused by state hackers to breach U.S. government elections support systems.

Today’s advisory also highlights¬†an additional 30 vulnerabilities often used to compromise organizations, including information on how security teams can decrease their exposure to attacks exploiting them.

To secure their systems and reduce the risk of a breach, the authoring agencies urged vendors, designers, developers, and end-user organizations to implement mitigation measures outlined in the advisory.

In June, MITRE unveiled the list of the 25 most prevalent and dangerous software weaknesses that persisted over the last two years. Two years ago, it also shared the topmost dangerous programming, design, and architecture hardware security flaws.

CISA and the FBI also released a compilation of the top 10 most exploited security flaws between 2016 and 2019.

“Organizations continue using unpatched software and systems, leaving easily discovered openings for cyber actors to target,” warned Neal Ziring, the Technical Director for NSA’s Cybersecurity Directorate.

“Older vulnerabilities can provide low-cost and high impact means for these actors to access sensitive data.”



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