Exim Mail Transfer Agent (MTA) Improper Input Validation

Added to KEV
2022-01-10
Federal due date
2022-07-10
Vendor
Exim
Product
Mail Transfer Agent (MTA)
EPSS
99.9th percentile (score 0.939, as of 2026-06-08)
NVD CVSS v3.1
Ransomware use
Unknown
Upstream
https://nvd.nist.gov/vuln/detail/CVE-2019-10149

CISA short description

Improper validation of recipient address in deliver_message() function in /src/deliver.c may lead to remote command 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.