Critical (9.8) in hcltech notes. EPSS 2.3% chance of exploitation in the next 30 days.
A vulnerability in the MIME message handling of the Notes client (versions 9 and 10) could potentially be exploited by an unauthenticated attacker resulting in a stack buffer overflow. This could allow a remote attacker to crash the client or inject code into the system which would execute with the privileges of the client.
Severity
CVSS 3.1
9.8 critical
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS
2.3% chance of exploitation in the next 30 days; higher than 82% of CVEs (scores of 2026-10-31)