Critical (9.8) in VMware VMware ESXi and Horizon DaaS. In CISA KEV since 2021-11-03, with known ransomware use. EPSS 98% chance of exploitation in the next 30 days.
OpenSLP as used in ESXi and the Horizon DaaS appliances has a heap overwrite issue. VMware has evaluated the severity of this issue to be in the Critical severity range with a maximum CVSSv3 base score of 9.8.
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
98% chance of exploitation in the next 30 days; higher than 99% of CVEs (scores of 2026-10-31)
CISA KEV
listed 2021-11-03, due 2022-05-03, known ransomware use