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Ubuntu 14.04 LTS / 16.04 LTS / 18.04 LTS / 20.04 LTS / 22.04 LTS / 24.04 LTS / 25.10 / 26.04 LTS : Inetutils vulnerabilities (USN-8387-1)

high Nessus Plugin ID 320402

Synopsis

The remote Ubuntu host is missing one or more security updates.

Description

The remote Ubuntu 14.04 LTS / 16.04 LTS / 18.04 LTS / 20.04 LTS / 22.04 LTS / 24.04 LTS / 25.10 / 26.04 LTS host has packages installed that are affected by multiple vulnerabilities as referenced in the USN-8387-1 advisory.

 It was discovered that the Inetutils telnet daemon incorrectly handled the CREDENTIALS_DIRECTORY environment variable. An attacker could possibly use this issue to escalate privileges. (CVE-2026-28372)

 It was discovered that the Inetutils telnet daemon did not properly validate buffer bounds when processing LINEMODE SLC suboptions. An attacker could possibly use this issue to cause a denial of service or execute arbitrary code. (CVE-2026-32746)

 It was discovered that the Inetutils telnet client incorrectly handled the NEW_ENVIRON SEND USERVAR option. An attacker could possibly use this issue to read arbitrary environment variables.
 (CVE-2026-32772)

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

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

Solution

Update the affected packages.

See Also

https://ubuntu.com/security/notices/USN-8387-1

Plugin Details

Severity: High

ID: 320402

File Name: ubuntu_USN-8387-1.nasl

Version: 1.1

Type: Local

Agent: unix

Published: 6/11/2026

Updated: 6/11/2026

Supported Sensors: Continuous Assessment, Nessus Agent, Nessus

Risk Information

VPR

Risk Factor: Critical

Score: 9.0

CVSS v2

Risk Factor: Medium

Base Score: 6.8

Temporal Score: 5.3

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

CVSS Score Source: CVE-2026-28372

CVSS v3

Risk Factor: High

Base Score: 7.8

Temporal Score: 7

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

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

Vulnerability Information

CPE: cpe:/o:canonical:ubuntu_linux:20.04:-:lts, cpe:/o:canonical:ubuntu_linux:24.04:-:lts, p-cpe:/a:canonical:ubuntu_linux:inetutils-syslogd, p-cpe:/a:canonical:ubuntu_linux:inetutils-ftp, cpe:/o:canonical:ubuntu_linux:25.10, p-cpe:/a:canonical:ubuntu_linux:inetutils-telnet, cpe:/o:canonical:ubuntu_linux:18.04:-:lts, p-cpe:/a:canonical:ubuntu_linux:inetutils-ping, p-cpe:/a:canonical:ubuntu_linux:inetutils-ftpd, p-cpe:/a:canonical:ubuntu_linux:telnet, cpe:/o:canonical:ubuntu_linux:14.04:-:lts, p-cpe:/a:canonical:ubuntu_linux:telnetd, p-cpe:/a:canonical:ubuntu_linux:inetutils-traceroute, p-cpe:/a:canonical:ubuntu_linux:inetutils-inetd, cpe:/o:canonical:ubuntu_linux:26.04:-:lts, p-cpe:/a:canonical:ubuntu_linux:inetutils-tools, cpe:/o:canonical:ubuntu_linux:16.04:-:lts, cpe:/o:canonical:ubuntu_linux:22.04:-:lts, p-cpe:/a:canonical:ubuntu_linux:inetutils-talkd, p-cpe:/a:canonical:ubuntu_linux:inetutils-telnetd, p-cpe:/a:canonical:ubuntu_linux:inetutils-talk

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

Exploit Available: true

Exploit Ease: Exploits are available

Patch Publication Date: 6/4/2026

Vulnerability Publication Date: 2/27/2026

Reference Information

CVE: CVE-2026-28372, CVE-2026-32746, CVE-2026-32772

USN: 8387-1