Microsoft’s December 2025 Patch Tuesday Addresses 57 Vulnerabilities, Including an Actively Exploited Zero-Day

11 Dec 2025

CybersecurityTechnologyThreatszero-dayvulnerability reportingknown exploited vulnerabilities (KEV)Patch TuesdayCybersecurity and Infrastructure Security Agency (CISA)Zero Day Initiativevulnerabilitiesvulnerability disclosureMicrosoftTrend Micro

Microsoft’s final Patch Tuesday of 2025 addressed 57 vulnerabilities, including one zero-day vulnerability that is being actively exploited in the wild. This brings the total number of security updates released by Microsoft in 2025 to 1,139, marking the second-highest annual total after 2020, according to data from Trend Micro. While the article does not provide specific CVE identifiers or technical details about the vulnerabilities, it highlights the ongoing challenge of managing software vulnerabilities in enterprise environments. The involvement of the Cybersecurity and Infrastructure Security Agency (CISA) and the Zero Day Initiative underscores the importance of coordinated vulnerability disclosure and response. For cybersecurity professionals, this update reinforces the critical need for timely patch management processes, particularly in light of the continued prevalence of zero-day exploits. Organizations should prioritize the deployment of these updates to mitigate potential risks associated with known vulnerabilities. However, without additional technical details, a deeper analysis of the specific flaws is not possible at this time.