Hazard

Is CVE-2022-21999 being exploited?

Ransomware crews are using this

CISA has linked this vulnerability to known ransomware campaigns. Treat any exposed instance as an active incident, not a patching ticket.

Microsoft Windows Print Spooler Privilege Escalation Vulnerability

Microsoft · Windows

CVSS 7.8 EPSS 42% no public exploit indexed ransomware Fix deadline passed 15 April 2022

What it is

Microsoft Windows Print Spooler contains an unspecified vulnerability which can allow for privilege escalation.

Why we say that

  • Linked by CISA to known ransomware campaigns
  • CISA's federal remediation deadline (2022-04-15) has passed
  • Listed in the CISA Known Exploited Vulnerabilities catalogue

Every line above comes from a named public source. Where the evidence is thin, we say so rather than inventing confidence — see methodology.

What to do

Apply updates per vendor instructions.

What it costs when this goes wrong

This is where UK enforcement meets the vulnerability record. This vulnerability is used in ransomware campaigns; here is what ransomware has cost UK organisations at the regulator.

All UK cases caused by ransomware →