Patch Sonar

Zero-days under active attack, explained in plain English

Zero-day report: January 2025

CISA added 14 exploited vulnerabilities to its catalog in January 2025, 2 fewer than December (16). 7 were zero-days, listed within a week of going public. 6 are known to be used by ransomware. The most-hit vendor was Microsoft, with 3.

14exploited flaws added
7zero-days
6used by ransomware
11vendors affected

By technology

Most-hit vendors

Every flaw added in January 2025

← December 2024February 2025 →

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