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
Exim before 4.99.3, in certain GnuTLS configurations, has a remotely reachable use-after-free in the BDAT body parsing path. It is triggered when a client sends a TLS close_notify mid-body during a CHUNKING transfer, followed by a final cleartext byte on the same TCP connection. This can lead to heap corruption. An unauthenticated network attacker exploiting this vulnerability could execute arbitrary code.
CVSS Score
9.8
EPSS Score
0.012
Published
2026-05-12
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
In Exim before 4.99.2, when the SPA authentication driver is used with an adversarial SPA resource, there can be an out-of-bounds write that crashes the connection instance, or erroneous data processing that divulges data from uninitialized heap memory.
CVSS Score
4.8
EPSS Score
0.004
Published
2026-04-30
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
0.004
Published
2025-12-14
A use-after-free in Exim 4.96 through 4.98.1 could allow users (with command-line access) to escalate privileges.
CVSS Score
8.1
EPSS Score
0.005
Published
2025-03-28
Exim 4.98 before 4.98.1, when SQLite hints and ETRN serialization are used, allows remote SQL injection. (Resolving SQL injection requires an update to 4.99.1 in certain non-default rate-limit configurations.)
CVSS Score
7.5
EPSS Score
0.758
Published
2025-02-21
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
0.412
Published
2024-07-04
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