Exim Buffer Overflow Vulnerability (CVE-2018-6789)
Severity: critical · Patch status: patched · Since 2021-11-03 · CVE-2018-6789
Exim contains a buffer overflow vulnerability in the base64d function part of the SMTP listener that may allow for remote code execution. CISA added CVE-2018-6789 to its Known Exploited Vulnerabilities catalog on Nov 3, 2021, 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 May 3, 2022 (BOD 22-01); treat that as the outer limit.
Sources
All live incidents on Threat Watch
