CVE-2023-51766

Exim before 4.97.1 allows SMTP smuggling in certain PIPELINING/CHUNKING configurations

published December 24, 2023

CVSS
—
EPSS
1%
Percentile
65.4
In the wild
Unconfirmed
What it is

Exim before 4.97.1 allows SMTP smuggling in certain PIPELINING/CHUNKING configurations. Remote attackers can use a published exploitation technique to inject e-mail messages with a spoofed MAIL FROM address, allowing bypass of an SPF protection mechanism. This occurs because Exim supports <LF>.<CR><LF> but some other popular e-mail servers do not.

The record
Technical detail
CVSS
Not scored
CVSS v4.0
Not supplied
EPSS
0.01102 · 65.4th percentile
Published
2023-12-24T00:00Z
EPSS history
Timeline
  • 24 DEC 00:00Z
    Exim before 4.97.1 allows SMTP smuggling in certain PIPELINING/CHUNKING configurations
    cvelistv5