known ransomware use

SolarWinds Serv-U Remote Code Execution Vulnerability

Added to KEV
2021-11-03
Federal due date
2021-11-17
Vendor
SolarWinds
Product
Serv-U
EPSS
100.0th percentile (score 0.943, as of 2026-06-08)
NVD CVSS v3.1
Ransomware use
Known
Upstream
https://nvd.nist.gov/vuln/detail/CVE-2021-35211

CISA short description

SolarWinds Serv-U contains an unspecified memory escape vulnerability which can allow for remote code execution.

Required action

Apply updates per vendor instructions.

EPSS percentile is the FIRST.org exploit-probability ranking as of the date noted above; it moves daily. CVSS reflects NVD's analysis at time of publication.