Exim Heap-Based Buffer Overflow Vulnerability

Added to KEV
2022-03-25
Federal due date
2022-04-15
Vendor
Exim
Product
Exim
EPSS
98.0th percentile (score 0.519, as of 2026-06-08)
NVD CVSS v3.1
Ransomware use
Unknown
Upstream
https://nvd.nist.gov/vuln/detail/CVE-2010-4344

CISA short description

Heap-based buffer overflow in the string_vformat function in string.c in Exim before 4.70 allows remote attackers to execute arbitrary code via an SMTP session.

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.