Detections
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Exim 4.88 < 4.99.4 Information Disclosure

medium Nessus Plugin ID 318666

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Synopsis

The remote mail server is potentially affected by an information disclosure vulnerability.

Description

According to its banner, the version of Exim running on the remote host is 4.88 or later but prior to 4.99.4. It is, therefore, potentially affected by an information disclosure vulnerability.

 - 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. (CVE-2026-48840)

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

Solution

Upgrade to Exim 4.99.4 or later.

See Also

http://www.nessus.org/u?8a32b012

Plugin Details

Severity: Medium

ID: 318666

File Name: exim_4_99_4.nasl

Version: 1.3

Type: Remote

Published: 6/4/2026

Updated: 6/9/2026

Configuration: Enable paranoid mode

Supported Sensors: Nessus

Risk Information

VPR

Risk Factor: Low

Score: 2.2

CVSS v2

Risk Factor: Medium

Base Score: 5

Temporal Score: 3.7

Vector: CVSS2#AV:N/AC:L/Au:N/C:P/I:N/A:N

CVSS Score Source: CVE-2026-48840

CVSS v3

Risk Factor: Medium

Base Score: 5.3

Temporal Score: 4.6

Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

Temporal Vector: CVSS:3.0/E:U/RL:O/RC:C

Vulnerability Information

CPE: cpe:/a:exim:exim

Required KB Items: Settings/ParanoidReport

Exploit Ease: No known exploits are available

Patch Publication Date: 5/29/2026

Vulnerability Publication Date: 5/29/2026

Reference Information

CVE: CVE-2026-48840

IAVA: 2026-A-0533