Detections
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Linux Distros Unpatched Vulnerability : CVE-2026-27855
medium Nessus Plugin ID 304111
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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.- Dovecot OTP authentication is vulnerable to replay attack under specific conditions. If auth cache is enabled, and username is altered in passdb, then OTP credentials can be cached so that same OTP reply is valid. An attacker able to observe an OTP exchange is able to log in as the user. If authentication happens over unsecure connection, switch to SCRAM protocol. Alternatively ensure the communcations are secured, and if possible switch to OAUTH2 or SCRAM. No publicly available exploits are known.
(CVE-2026-27855)
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-2026-27855
Plugin Details
Severity: Medium
ID: 304111
File Name: unpatched_CVE_2026_27855.nasl
Version: 1.5
Type: Local
Agent: unix
Family: Misc.
Published: 3/28/2026
Updated: 4/17/2026
Supported Sensors: Frictionless Assessment AWS, Frictionless Assessment Azure, Frictionless Assessment Agent, Nessus Agent, Agentless Assessment, Nessus
Risk Information
VPR
Risk Factor: Medium
Score: 6.0
CVSS v2
Risk Factor: Medium
Base Score: 5.8
Temporal Score: 4.9
Vector: CVSS2#AV:N/AC:M/Au:N/C:P/I:P/A:N
CVSS Score Source: CVE-2026-27855
CVSS v3
Risk Factor: Medium
Base Score: 6.8
Temporal Score: 6.2
Vector: CVSS:3.0/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N
Temporal Vector: CVSS:3.0/E:U/RL:U/RC:C
Vulnerability Information
CPE: cpe:/o:canonical:ubuntu_linux:16.04:-:lts, p-cpe:/a:canonical:ubuntu_linux:dovecot, cpe:/o:debian:debian_linux:11.0, p-cpe:/a:centos:centos:dovecot-pigeonhole, cpe:/o:centos:centos:7, p-cpe:/a:centos:centos:dovecot, p-cpe:/a:redhat:enterprise_linux:dovecot-pigeonhole, p-cpe:/a:centos:centos:dovecot-pgsql, p-cpe:/a:redhat:enterprise_linux:dovecot, cpe:/o:canonical:ubuntu_linux:18.04:-:lts, p-cpe:/a:debian:debian_linux:dovecot, cpe:/o:redhat:enterprise_linux:7, p-cpe:/a:centos:centos:dovecot-devel, cpe:/o:canonical:ubuntu_linux:20.04:-:lts, p-cpe:/a:centos:centos:dovecot-mysql, p-cpe:/a:redhat:enterprise_linux:dovecot-mysql, cpe:/o:canonical:ubuntu_linux:14.04:-:lts, p-cpe:/a:redhat:enterprise_linux:dovecot-devel, p-cpe:/a:redhat:enterprise_linux:dovecot-pgsql
Required KB Items: Host/local_checks_enabled, Host/cpu, global_settings/vendor_unpatched, Host/OS/identifier
Exploit Ease: No known exploits are available
Vulnerability Publication Date: 3/27/2026
Reference Information
CVE: CVE-2026-27855