Exim before 4.100.1, when Proxy-Protocol is used with an attacker-controlled proxy, allows attackers to read certain uninitialized data from stack memory.
CVSS Score
7.5
EPSS Score
0.002
Published
2026-09-19
Exim before 4.100.1 allows SMTP smuggling in which the received message does not match any sent message, and instead depends on crafted data sent after a rejection during DATA processing.
CVSS Score
4.0
EPSS Score
0.002
Published
2026-09-19
Exim before 4.100.1, when Proxy-Protocol is used with an attacker-controlled proxy, has an out-of-bounds write.
CVSS Score
7.0
EPSS Score
0.003
Published
2026-09-19
Exim before 4.100.1, when certain non-default TLS settings are used with GnuTLS, has a use-after-free.
CVSS Score
3.7
EPSS Score
0.003
Published
2026-09-19
Exim before 4.99.5 allows directory traversal to access files outside of the spool area, and consequently gain privileges, because arguments related to queue-name are mishandled.
CVSS Score
8.4
EPSS Score
0.004
Published
2026-07-24
Exim before 4.99.5 allows .forward privilege escalation because force_command for a pipe transport is mishandled.
CVSS Score
7.4
EPSS Score
0.001
Published
2026-07-24
Exim before 4.99.1, with certain non-default rate-limit configurations, allows a remote heap-based buffer overflow because database records are cast directly to internal structures without validation.
CVSS Score
7.0
EPSS Score
0.005
Published
2025-12-14
Exim through 4.97.1 misparses a multiline RFC 2231 header filename, and thus remote attackers can bypass a $mime_filename extension-blocking protection mechanism, and potentially deliver executable attachments to the mailboxes of end users.
CVSS Score
5.4
EPSS Score
0.415
Published
2024-07-04
Exim AUTH Out-Of-Bounds Write Remote Code Execution Vulnerability. This vulnerability allows remote attackers to execute arbitrary code on affected installations of Exim. Authentication is not required to exploit this vulnerability.
The specific flaw exists within the smtp service, which listens on TCP port 25 by default. The issue results from the lack of proper validation of user-supplied data, which can result in a write past the end of a buffer. An attacker can leverage this vulnerability to execute code in the context of the service account.
. Was ZDI-CAN-17434.
CVSS Score
9.8
EPSS Score
0.122
Published
2024-05-03
Exim SMTP Challenge Stack-based Buffer Overflow Remote Code Execution Vulnerability. This vulnerability allows remote attackers to execute arbitrary code on affected installations of Exim. Authentication is not required to exploit this vulnerability.
The specific flaw exists within the handling of NTLM challenge requests. The issue results from the lack of proper validation of the length of user-supplied data prior to copying it to a fixed-length stack-based buffer. An attacker can leverage this vulnerability to execute code in the context of the service account.
. Was ZDI-CAN-17515.
CVSS Score
8.1
EPSS Score
0.038
Published
2024-05-03
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