The remote CentOS Linux 8 host has packages installed that are affected by multiple vulnerabilities as referenced in the CESA-2020:4763 advisory.

  - dovecot: command followed by sufficient number of newlines leads to use-after-free (CVE-2020-10958)

  - dovecot: sending mail with empty quoted localpart leads to DoS (CVE-2020-10967)

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

The Unity Linux 20 host has a package installed that is affected by a vulnerability as referenced in the UTSA-2026-090119 advisory.

    In Dovecot before 2.3.10.1, a crafted SMTP/LMTP message triggers an unauthenticated use-after-free bug in     submission-login, submission, or lmtp, and can lead to a crash under circumstances involving many newlines     after a command.

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

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

This update for dovecot23 to 2.3.10 fixes the following issues :

Security issues fixed :

  - CVE-2020-10957: Fixed a crash caused by malformed NOOP     commands (bsc#1171457).

  - CVE-2020-10958: Fixed a use-after-free when receiving     too many newlines (bsc#1171458).

  - CVE-2020-10967: Fixed a crash in the lmtp and submission     components caused by mails with empty quoted localparts     (bsc#1171456).

Non-security issues fixed :

  - The update to 2.3.10 fixes several bugs. Please refer to     https://dovecot.org/doc/NEWS for a complete list of     changes.

This update was imported from the SUSE:SLE-15-SP1:Update update project.

The version of Tencent Linux installed on the remote TencentOS Server 3 host is prior to tested version. It is, therefore, affected by multiple vulnerabilities as referenced in the TSSA-2022:0115 advisory.

    Package updates are available for TencentOS Server 3 that fix the following vulnerabilities:

    CVE-2019-11500:
    In Dovecot before 2.2.36.4 and 2.3.x before 2.3.7.2 (and Pigeonhole before 0.5.7.2), protocol processing     can fail for quoted strings. This occurs because '\0' characters are mishandled, and can lead to out-of-     bounds writes and remote code execution.

    CVE-2019-3814:
    It was discovered that Dovecot before versions 2.2.36.1 and 2.3.4.1 incorrectly handled client     certificates. A remote attacker in possession of a valid certificate with an empty username field could     possibly use this issue to impersonate other users.

    CVE-2020-10957:
    In Dovecot before 2.3.10.1, unauthenticated sending of malformed parameters to a NOOP command causes a     NULL Pointer Dereference and crash in submission-login, submission, or lmtp.

    CVE-2020-10958:
    In Dovecot before 2.3.10.1, a crafted SMTP/LMTP message triggers an unauthenticated use-after-free bug in     submission-login, submission, or lmtp, and can lead to a crash under circumstances involving many newlines     after a command.

    CVE-2020-10967:
    In Dovecot before 2.3.10.1, remote unauthenticated attackers can crash the lmtp or submission process by     sending mail with an empty localpart.

    CVE-2020-12100:
    In Dovecot before 2.3.11.3, uncontrolled recursion in submission, lmtp, and lda allows remote attackers to     cause a denial of service (resource consumption) via a crafted e-mail message with deeply nested MIME     parts.

    CVE-2020-12673:
    In Dovecot before 2.3.11.3, sending a specially formatted NTLM request will crash the auth service because     of an out-of-bounds read.

    CVE-2020-12674:
    In Dovecot before 2.3.11.3, sending a specially formatted RPA request will crash the auth service because     a length of zero is mishandled.

    CVE-2020-24386:
    An issue was discovered in Dovecot before 2.3.13. By using IMAP IDLE, an authenticated attacker can     trigger unhibernation via attacker-controlled parameters, leading to access to other users' email messages     (and path disclosure).

    CVE-2020-25275:
    Dovecot before 2.3.13 has Improper Input Validation in lda, lmtp, and imap, leading to an application     crash via a crafted email message with certain choices for ten thousand MIME parts.

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

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

The Rocky Linux 8.6 host has packages installed that are affected by multiple vulnerabilities as referenced in the CIQ ciqsa-2026_0035 advisory.

    This advisory aggregates security fixes for the dovecot SRPM in CIQ LTS 8.6. It addresses 21 CVEs:
    CVE-2019-11500, CVE-2020-24386, CVE-2020-25275, CVE-2020-12100, CVE-2017-14461, and 16 more.

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

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

ID	Name	Product	Family	Published	Updated	Severity
145961	CentOS 8 : dovecot (CESA-2020:4763)	Nessus	CentOS Local Security Checks	2/1/2021	3/23/2021	medium
348870	Unity Linux 20.1050e / 20.1060e / 20.1070e Security Update: dovecot (UTSA-2026-090119)	Nessus	Unity Linux Local Security Checks	9/22/2026	9/22/2026	medium
136961	openSUSE Security Update : dovecot23 (openSUSE-2020-720)	Nessus	SuSE Local Security Checks	5/29/2020	3/8/2024	high
239574	TencentOS Server 3: dovecot (TSSA-2022:0115)	Nessus	Tencent Local Security Checks	6/16/2025	11/20/2025	critical
357898	Rocky Linux 8.6 [CIQ] Security Update: dovecot / dovecot-debuginfo / dovecot-debugsource / dovecot-devel / etc Multiple Vulnerabilities (ciqsa-2026_0035)	Nessus	Rocky Linux Local Security Checks	10/1/2026	10/11/2026	critical

Detections

Analytics

Plugins Search

medium

medium

high

critical

critical