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
0.004
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
0.003
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
0.004
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
0.003
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 4.88 before 4.99.4, in some proxy configurations, mishandles certain short payloads, leading to disclosure of uninitialized stack memory values to a client.
CVSS Score
5.3
EPSS Score
0.003
Published
2026-05-30
In Exim before 4.99.2, on systems using musl libc (not glibc), an attacker can crash the connection instance when malformed DNS data is present in PTR records. This is caused by a dn_expand oddity in octal printing.
CVSS Score
5.9
EPSS Score
0.004
Published
2026-04-30
In Exim before 4.99.2, when JSON lookup is enabled, an out-of-bounds heap write can occur when a JSON operator encounters malformed JSON in an untrusted header, because of an incorrect implementation of \ skipping.
CVSS Score
6.5
EPSS Score
0.003
Published
2026-04-30
In Exim before 4.99.2, when utf8 operators are enabled, there is an out-of-bounds read if large UTF-8 trailing characters are present (malformed UTF-8 header data). Information might be divulged within an error message produced during handling of an unrelated e-mail message.
CVSS Score
3.7
EPSS Score
0.002
Published
2026-04-30
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