CVE-2020-25275

dovecot: Denial of service via mail MIME parsing

Severity Score

7.5

*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

*SSVC

Descriptions

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.

Dovecot versiones anteriores a 2.3.13, presenta una Comprobación de Entrada Inapropiada en lda, lmtp e imap, conllevando a un bloqueo de la aplicación por medio de un mensaje de correo electrónico diseñado con determinadas opciones para diez mil partes MIME.

It was discovered that Dovecot incorrectly handled certain imap hibernation commands. A remote authenticated attacker could possibly use this issue to access other users' email. This issue only affected Ubuntu 18.04 LTS, Ubuntu 20.04 LTS, and Ubuntu 20.10. Innokentii Sennovskiy discovered that Dovecot incorrectly handled MIME parsing. A remote attacker could possibly use this issue to cause Dovecot to crash, resulting in a denial of service. Various other issues were also addressed.

*Credits: N/A

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

None

Availability

High

Attack Vector

Network

Attack Complexity

Low

Authentication

None

Confidentiality

None

Integrity

None

Availability

Partial

* Common Vulnerability Scoring System

SSVC

Decision:-

Exploitation

Automatable

Tech. Impact

* Organization's Worst-case Scenario

Timeline

2020-09-11 CVE Reserved
2021-01-04 CVE Published
2024-08-04 CVE Updated
2025-04-02 EPSS Updated
---------- Exploited in Wild
---------- KEV Due Date
---------- First Exploit

CWE

CWE-20: Improper Input Validation

CAPEC

References (10)

URL	Tag	Source
http://packetstormsecurity.com/files/160841/Dovecot-2.3.11.3-Denial-Of-Service.html	Third Party Advisory
http://seclists.org/fulldisclosure/2021/Jan/18	Mailing List
http://www.openwall.com/lists/oss-security/2021/01/04/3	Mailing List

URL	Date	SRC

URL	Date	SRC

URL	Date	SRC
https://dovecot.org/pipermail/dovecot-news/2021-January/000451.html	2023-11-07
https://dovecot.org/security	2023-11-07
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/GXDKFLOCUP7I4ELGQ2F4P5TGC6NXMYV7	2023-11-07
https://security.gentoo.org/glsa/202101-01	2023-11-07
https://www.debian.org/security/2021/dsa-4825	2023-11-07
https://access.redhat.com/security/cve/CVE-2020-25275	2021-05-18
https://bugzilla.redhat.com/show_bug.cgi?id=1912460	2021-05-18

Affected Vendors, Products, and Versions

Vendor		Product				Version		Other		Status
Vendor	Product	Version	Other	Status	<-- -->	Vendor	Product	Version	Other	Status
Dovecot Search vendor "Dovecot"		Dovecot Search vendor "Dovecot" for product "Dovecot"				< 2.3.13 Search vendor "Dovecot" for product "Dovecot" and version " < 2.3.13"		-		Affected
Debian Search vendor "Debian"		Debian Linux Search vendor "Debian" for product "Debian Linux"				10.0 Search vendor "Debian" for product "Debian Linux" and version "10.0"		-		Affected
Fedoraproject Search vendor "Fedoraproject"		Fedora Search vendor "Fedoraproject" for product "Fedora"				32 Search vendor "Fedoraproject" for product "Fedora" and version "32"		-		Affected