Remediation Gaps Persist as Exploited Vulnerabilities Dominate Attack Surface, Verizon Finds

Only about a quarter of the vulnerabilities that the Cybersecurity and Infrastructure Security Agency (CISA) has identified as actively exploited were fully patched, according to a new analysis released by Verizon. The study also revealed that exploitation of these flaws has become the most frequent method attackers use to gain an initial foothold, accounting for 31% of all entry points observed in the data set.

Verizon’s research examined a broad sample of security incidents reported to the agency and other public sources. By cross‑referencing the incidents with CISA’s list of known exploited vulnerabilities, the analysts were able to track how often each weakness was addressed after detection. The resulting remediation rate of 26% signals a substantial lag between identification and mitigation, especially given the high stakes associated with publicly disclosed exploit techniques.

CISA maintains a regularly updated catalog of vulnerabilities that have been confirmed in the wild, offering organizations a prioritized list of threats that demand immediate attention. The agency’s intent is to streamline defensive efforts by highlighting flaws that adversaries are already leveraging, thereby reducing the window of exposure for critical infrastructure and private‑sector networks alike.

Several factors contribute to the low remediation figure. Many organizations operate on extended patch cycles, often constrained by legacy systems, testing requirements, or limited staffing. In some cases, the exploit may target components that are deeply embedded in operational technology, making swift updates technically challenging or potentially disruptive to essential services.

The findings underscore a growing disconnect between threat intelligence and practical security operations. When exploitation becomes the leading initial access vector, the cost of delayed patching escalates, as attackers can more readily bypass traditional defenses such as firewalls or credential‑based controls.

Industry observers note that the shift toward exploitation‑driven breaches aligns with broader trends in cybercrime, including the rise of ransomware groups that prioritize quick, high‑impact entry methods. The study’s data suggest that defenders must move beyond reactive patching and adopt more proactive measures, such as threat‑informed vulnerability management and automated remediation workflows.

Looking ahead, CISA and other federal agencies are expected to reinforce guidance on rapid patch deployment and to promote information‑sharing frameworks that help organizations act on exploit alerts faster. Verizon’s report serves as a reminder that without accelerated remediation, the gap between known threats and applied fixes will continue to leave networks vulnerable to the very exploits that have already been publicly documented.