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 remote NewStart CGSL host, running version CORE 5.04 / MAIN 5.04, has dovecot packages installed that are affected by multiple vulnerabilities:

  - 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-2020-12100)

  - 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-2020-12673)

  - 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-2020-12674)

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

Several vulnerabilities have been discovered in the Dovecot email server.

  - CVE-2020-12100     Receiving mail with deeply nested MIME parts leads to     resource exhaustion as Dovecot attempts to parse it.

  - CVE-2020-12673     Dovecot's NTLM implementation does not correctly check     message buffer size, which leads to a crash when reading     past allocation.

  - CVE-2020-12674     Dovecot's RPA mechanism implementation accepts     zero-length message, which leads to assert-crash later     on.

The remote Ubuntu 16.04 LTS / 18.04 LTS / 20.04 LTS host has packages installed that are affected by multiple vulnerabilities as referenced in the USN-4456-1 advisory.

    It was discovered that Dovecot incorrectly handled deeply nested MIME parts. A remote attacker could     possibly use this issue to cause Dovecot to consume resources, resulting in a denial of service.
    (CVE-2020-12100)

    It was discovered that Dovecot incorrectly handled memory when using NTLM. A remote attacker could     possibly use this issue to cause Dovecot to crash, resulting in a denial of service. (CVE-2020-12673)

    It was discovered that the Dovecot RPA mechanism incorrectly handled zero-length messages. A remote     attacker could possibly use this issue to cause Dovecot to crash, resulting in a denial of service.
    (CVE-2020-12674)

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.

This update for dovecot23 fixes the following issues :

CVE-2020-12673: improper implementation of NTLM does not check message buffer size (bsc#1174922).

CVE-2020-12674: improper implementation of RPA mechanism (bsc#1174923).

Note that Tenable Network Security has extracted the preceding description block directly from the SUSE security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

The remote Redhat Enterprise Linux 7 host has packages installed that are affected by multiple vulnerabilities as referenced in the RHSA-2020:3617 advisory.

    Dovecot is an IMAP server for Linux and other UNIX-like systems, written primarily with security in mind.
    It also contains a small POP3 server, and supports e-mail in either the maildir or mbox format. The SQL     drivers and authentication plug-ins are provided as subpackages.

    Security Fix(es):

    * dovecot: Resource exhaustion via deeply nested MIME parts (CVE-2020-12100)

    * dovecot: Out of bound reads in dovecot NTLM implementation (CVE-2020-12673)

    * dovecot: Crash due to assert in RPA implementation (CVE-2020-12674)

    For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and     other related information, refer to the CVE page(s) listed in the References section.

Tenable has extracted the preceding description block directly from the Red Hat Enterprise 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 Unity Linux 20 host has a package installed that is affected by a vulnerability as referenced in the UTSA-2026-090088 advisory.

    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.

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.

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.

The remote Redhat Enterprise Linux 8 host has packages installed that are affected by multiple vulnerabilities as referenced in the RHSA-2020:3736 advisory.

    Dovecot is an IMAP server for Linux and other UNIX-like systems, written primarily with security in mind.
    It also contains a small POP3 server, and supports e-mail in either the maildir or mbox format. The SQL     drivers and authentication plug-ins are provided as subpackages.

    Security Fix(es):

    * dovecot: Resource exhaustion via deeply nested MIME parts (CVE-2020-12100)

    * dovecot: Out of bound reads in dovecot NTLM implementation (CVE-2020-12673)

    * dovecot: Crash due to assert in RPA implementation (CVE-2020-12674)

    For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and     other related information, refer to the CVE page(s) listed in the References section.

Tenable has extracted the preceding description block directly from the Red Hat Enterprise 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 version of dovecot installed on the remote host is prior to 2.2.36-6. It is, therefore, affected by multiple vulnerabilities as referenced in the ALAS2-2020-1489 advisory.

    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. A flaw was found in dovecot. An attacker can use the way dovecot handles     RPA (Remote Passphrase Authentication) to crash the authentication process repeatedly preventing login.
    The highest threat from this vulnerability is to system availability. (CVE-2020-12674)

    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. A flaw was found in dovecot. A remote attacker could cause a denial of service by repeatedly     sending emails containing MIME parts containing malicious content of which dovecot will attempt to parse.
    The highest threat from this vulnerability is to system availability. (CVE-2020-12100)

    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. A flaw was found in dovecot. An out-of-bounds read flaw was found in the way     dovecot handled NTLM authentication allowing an attacker to crash the dovecot auth process repeatedly     preventing login. The highest threat from this vulnerability is to system availability. (CVE-2020-12673)

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

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

According to the versions of the dovecot packages installed, the EulerOS installation on the remote host is affected by the following vulnerabilities :

  - 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-2020-12673)

  - 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-2020-12674)

Note that Tenable Network Security has extracted the preceding description block directly from the EulerOS security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

Aki Tuomi reports :

Parsing mails with a large number of MIME parts could have resulted in excessive CPU usage or a crash due to running out of stack memory..

Dovecot's NTLM implementation does not correctly check message buffer size, which leads to reading past allocation which can lead to crash

lmtp/submission: Issuing the RCPT command with an address that has the empty quoted string as local-part causes the lmtp service to crash.

Dovecot's RPA mechanism implementation accepts zero-length message, which leads to assert-crash later on.

Several vulnerabilities have been discovered in the Dovecot email server.

CVE-2020-12100

Receiving mail with deeply nested MIME parts leads to resource exhaustion as Dovecot attempts to parse it.

CVE-2020-12673

Dovecot's NTLM implementation does not correctly check message buffer size, which leads to a crash when reading past allocation.

CVE-2020-12674

Dovecot's RPA mechanism implementation accepts zero-length message, which leads to assert-crash later on.

For Debian 9 stretch, these problems have been fixed in version 1:2.2.27-3+deb9u6.

We recommend that you upgrade your dovecot packages.

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

NOTE: Tenable Network Security has extracted the preceding description block directly from the DLA security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

The remote MiracleLinux 8 host has packages installed that are affected by multiple vulnerabilities as referenced in the AXSA:2020-546:03 advisory.

    * dovecot: Resource exhaustion via deeply nested MIME parts (CVE-2020-12100)
      * dovecot: Out of bound reads in dovecot NTLM implementation (CVE-2020-12673)
      * dovecot: Crash due to assert in RPA implementation (CVE-2020-12674)

Tenable has extracted the preceding description block directly from the MiracleLinux 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 remote MiracleLinux 7 host has packages installed that are affected by multiple vulnerabilities as referenced in the AXSA:2020-288:02 advisory.

    * dovecot: Resource exhaustion via deeply nested MIME parts (CVE-2020-12100)
      * dovecot: Out of bound reads in dovecot NTLM implementation (CVE-2020-12673)
      * dovecot: Crash due to assert in RPA implementation (CVE-2020-12674)

Tenable has extracted the preceding description block directly from the MiracleLinux 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	名称	产品	系列	发布时间	最近更新时间	严重程度
239574	TencentOS Server 3: dovecot (TSSA-2022:0115)	Nessus	Tencent Local Security Checks	2025/6/16	2025/11/20	critical
147381	NewStart CGSL CORE 5.04 / MAIN 5.04 : dovecot Multiple Vulnerabilities (NS-SA-2021-0041)	Nessus	NewStart CGSL Local Security Checks	2021/3/10	2024/1/11	high
139553	Debian DSA-4745-1 : dovecot - security update	Nessus	Debian Local Security Checks	2020/8/13	2024/2/26	high
139567	Ubuntu 16.04 LTS / 18.04 LTS / 20.04 LTS : Dovecot vulnerabilities (USN-4456-1)	Nessus	Ubuntu Local Security Checks	2020/8/13	2024/8/29	high
139689	SUSE SLES15 Security Update : dovecot23 (SUSE-SU-2020:2267-1)	Nessus	SuSE Local Security Checks	2020/8/19	2024/2/23	high
140204	RHEL 7 : dovecot (RHSA-2020:3617)	Nessus	Red Hat Local Security Checks	2020/9/3	2024/11/7	high
349059	Unity Linux 20.1050e / 20.1060e / 20.1070e Security Update: dovecot (UTSA-2026-090088)	Nessus	Unity Linux Local Security Checks	2026/9/22	2026/9/22	high
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	2026/10/1	2026/10/11	critical
140582	RHEL 8 : dovecot (RHSA-2020:3736)	Nessus	Red Hat Local Security Checks	2020/9/14	2024/11/7	high
140636	Amazon Linux 2 : dovecot (ALAS-2020-1489)	Nessus	Amazon Linux Local Security Checks	2020/9/17	2024/12/11	high
140884	EulerOS 2.0 SP3 : dovecot (EulerOS-SA-2020-2117)	Nessus	Huawei Local Security Checks	2020/9/28	2024/2/19	high
139589	FreeBSD : mail/dovecot -- multiple vulnerabilities (87a07de1-e55e-4d51-bb64-8d117829a26a)	Nessus	FreeBSD Local Security Checks	2020/8/14	2020/8/20	high
139626	Debian DLA-2328-1 : dovecot security update	Nessus	Debian Local Security Checks	2020/8/18	2024/2/26	high
294138	MiracleLinux 8 : dovecot-2.3.8-2.el8.2 (AXSA:2020-546:03)	Nessus	Miracle Linux Local Security Checks	2026/1/20	2026/1/20	high
294188	MiracleLinux 7 : dovecot-2.2.36-6.el7.1 (AXSA:2020-288:02)	Nessus	Miracle Linux Local Security Checks	2026/1/20	2026/1/20	high

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