Debian dsa-6309 : exim4 - security update

high Nessus Plugin ID 317932

Synopsis

The remote Debian host is missing a security-related update.

Description

The remote Debian 12 / 13 host has packages installed that are affected by a vulnerability as referenced in the dsa-6309 advisory.

- ------------------------------------------------------------------------- Debian Security Advisory DSA-6309-1 [email protected] https://www.debian.org/security/ Salvatore Bonaccorso May 29, 2026 https://www.debian.org/security/faq
- -------------------------------------------------------------------------

Package : exim4 CVE ID : CVE-2026-48840

Warisjeet Singh discovered that Exim, a mail transport agent, does not properly handle PROXY frames whose declared payload length is too short for the claimed address family, which may result in information disclosure in configurations with SUPPORT_PROXY and 'host_proxy' set.

For the oldstable distribution (bookworm), this problem has been fixed in version 4.96-15+deb12u10.

For the stable distribution (trixie), this problem has been fixed in version 4.98.2-1+deb13u3.

We recommend that you upgrade your exim4 packages.

For the detailed security status of exim4 please refer to its security tracker page at:
https://security-tracker.debian.org/tracker/exim4

Further information about Debian Security Advisories, how to apply these updates to your system and frequently asked questions can be found at: https://www.debian.org/security/

Mailing list: [email protected]

Tenable has extracted the preceding description block directly from the Debian security advisory.

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

Solution

Upgrade the exim4 packages.

Plugin Details

Severity: High

ID: 317932

File Name: debian_DSA-6309.nasl

Version: 1.1

Type: Local

Agent: unix

Family: Debian Local Security Checks

Published: 5/29/2026

Updated: 5/29/2026

Supported Sensors: Agentless Assessment, Continuous Assessment, Frictionless Assessment Agent, Nessus Agent, Nessus

Risk Information

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: High

Base Score: 7.5

Temporal Score: 6.5

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

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

Vulnerability Information

CPE: p-cpe:/a:debian:debian_linux:exim4, p-cpe:/a:debian:debian_linux:exim4-base, p-cpe:/a:debian:debian_linux:exim4-dev, p-cpe:/a:debian:debian_linux:exim4-daemon-light, p-cpe:/a:debian:debian_linux:exim4-config, cpe:/o:debian:debian_linux:13.0, p-cpe:/a:debian:debian_linux:eximon4, cpe:/o:debian:debian_linux:12.0, p-cpe:/a:debian:debian_linux:exim4-daemon-heavy

Required KB Items: Host/local_checks_enabled, Host/Debian/release, Host/Debian/dpkg-l

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

Detections

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