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Linux Distros Unpatched Vulnerability : CVE-2026-33603

medium Nessus Plugin ID 315673

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Synopsis

The Linux/Unix host has one or more packages installed with a vulnerability that the vendor indicates will not be patched.

Description

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available.

 - Attacker can use a specially crafted base64 exchange between Dovecot and Client to fake SCRAM TLS channel binding. This requires that the attacker is able to position itself between Dovecot and the client connection. If successful, the attacker can eavesdrop communications between Dovecot and client as MITM proxy. Install fixed version. No publicly available exploits are known. (CVE-2026-33603)

Note that Nessus relies on the presence of the package as reported by the vendor.

Solution

There is no known solution at this time.

See Also

https://access.redhat.com/security/cve/cve-2026-33603

https://ubuntu.com/security/CVE-2026-33603

Plugin Details

Severity: Medium

ID: 315673

File Name: unpatched_CVE_2026_33603.nasl

Version: 1.11

Type: Local

Agent: unix

Family: Misc.

Published: 5/20/2026

Updated: 6/10/2026

Supported Sensors: Agentless Assessment, Frictionless Assessment Agent, Frictionless Assessment AWS, Frictionless Assessment Azure, Nessus Agent, Nessus

Risk Information

VPR

Risk Factor: Medium

Score: 4.4

CVSS v2

Risk Factor: Medium

Base Score: 4.6

Temporal Score: 3.9

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

CVSS Score Source: CVE-2026-33603

CVSS v3

Risk Factor: Medium

Base Score: 5.3

Temporal Score: 4.9

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

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

Vulnerability Information

CPE: cpe:/o:canonical:ubuntu_linux:20.04:-:lts, p-cpe:/a:centos:centos:dovecot, cpe:/o:redhat:enterprise_linux:6, p-cpe:/a:redhat:enterprise_linux:dovecot-devel, p-cpe:/a:centos:centos:dovecot-devel, cpe:/o:redhat:enterprise_linux:9, cpe:/o:canonical:ubuntu_linux:18.04:-:lts, p-cpe:/a:centos:centos:dovecot-mysql, p-cpe:/a:redhat:enterprise_linux:dovecot-mysql, cpe:/o:centos:centos:8, p-cpe:/a:redhat:enterprise_linux:dovecot-pigeonhole, p-cpe:/a:centos:centos:dovecot-pigeonhole, cpe:/o:redhat:enterprise_linux:8, cpe:/o:redhat:enterprise_linux:10, cpe:/o:canonical:ubuntu_linux:14.04:-:lts, p-cpe:/a:centos:centos:dovecot-pgsql, cpe:/o:canonical:ubuntu_linux:16.04:-:lts, p-cpe:/a:redhat:enterprise_linux:dovecot-pgsql, p-cpe:/a:redhat:enterprise_linux:dovecot, p-cpe:/a:canonical:ubuntu_linux:dovecot

Required KB Items: Host/cpu, Host/local_checks_enabled, global_settings/vendor_unpatched, Host/OS/identifier

Exploit Ease: No known exploits are available

Vulnerability Publication Date: 5/12/2026

Reference Information

CVE: CVE-2026-33603