Microsoft Windows Secondary Logon Service Privilege Escalation Vulnerability (CVE-2016-0099)
Severity: high · Patch status: patched · Since 2022-03-03 · CVE-2016-0099
A privilege escalation vulnerability exists in Microsoft Windows if the Windows Secondary Logon Service fails to properly manage request handles in memory. An attacker who successfully exploited this vulnerability could run arbitrary code as an administrator. CISA added CVE-2016-0099 to its Known Exploited Vulnerabilities catalog on Mar 3, 2022, which means attackers are exploiting it in the wild. CISA reports known use in ransomware campaigns.
What to do
- Apply updates per vendor instructions.
- US federal agencies must remediate by Mar 24, 2022 (BOD 22-01); treat that as the outer limit.
Sources
All live incidents on Threat Watch
