Patch Sonar

Zero-days under active attack, explained in plain English

Zero-day report: March 2025

CISA added 32 exploited vulnerabilities to its catalog in March 2025, 5 more than February (27). 14 were zero-days, listed within a week of going public. 4 are known to be used by ransomware. The most-hit vendor was Microsoft, with 7.

32exploited flaws added
14zero-days
4used by ransomware
18vendors affected

By technology

Most-hit vendors

Every flaw added in March 2025

← February 2025April 2025 →

Source: CISA's Known Exploited Vulnerabilities catalog, by the date CISA added each flaw. Ransomware use is CISA's flag.