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Ox Dovecot Pro CVE-2025-59032

| EUVDEUVD-2025-209092 HIGH
Improper Input Validation (CWE-20)
2026-03-27 OX GHSA-w2gj-cmfm-c4j4
Denial Of Service Ox Dovecot Pro
7.5
CVSS 3.1 · Vendor: OX
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Severity by source

Vendor (OX) PRIMARY
7.5 HIGH
AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Ubuntu
MEDIUM
qualitative
SUSE
HIGH
qualitative
Red Hat
7.5 HIGH
qualitative

Primary rating from Vendor (OX).

CVSS VectorVendor: OX

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

Lifecycle Timeline

4
Patch released
Mar 31, 2026 - 13:49 nvd
Patch available
EUVD ID Assigned
Mar 27, 2026 - 08:30 euvd
EUVD-2025-209092
Analysis Generated
Mar 27, 2026 - 08:30 vuln.today
CVE Published
Mar 27, 2026 - 08:10 nvd
HIGH 7.5

DescriptionCVE.org

ManageSieve AUTHENTICATE command crashes when using literal as SASL initial response. This can be used to crash ManageSieve service repeatedly, making it unavailable for other users. Control access to ManageSieve port, or disable the service if it's not needed. Alternatively upgrade to a fixed version. No publicly available exploits are known.

AnalysisAI

OX Dovecot Pro ManageSieve service crashes when processing AUTHENTICATE commands with SASL initial responses using literal format, enabling unauthenticated remote attackers to repeatedly crash the service and deny availability to legitimate users (CVSS 7.5, High availability impact). The vulnerability affects OX Dovecot Pro installations with ManageSieve enabled. No public exploit identified at time of analysis, and EPSS data was not provided in available intelligence.

Technical ContextAI

The vulnerability resides in the ManageSieve protocol implementation within OX Dovecot Pro (CPE cpe:2.3:a:open-xchange_gmbh:ox_dovecot_pro). ManageSieve is an IETF protocol (RFC 5804) that allows users to manage server-side mail filtering rules (Sieve scripts). The flaw is classified as CWE-20 (Improper Input Validation), indicating the service fails to properly validate or handle literal syntax when used as a SASL (Simple Authentication and Security Layer) initial response during the AUTHENTICATE command sequence. This input validation failure causes the ManageSieve process to crash, requiring restart and disrupting service availability for all users attempting to manage their mail filters.

RemediationAI

Upgrade to the fixed version of OX Dovecot Pro as specified in the vendor security advisory at https://documentation.open-xchange.com/dovecot/security/advisories/csaf/2026/oxdc-adv-2026-0001.json. Until patching is possible, implement network-level access controls to restrict ManageSieve port access (typically TCP 4190) to only trusted IP ranges or authenticated VPN connections. Organizations not requiring server-side Sieve script management capabilities should disable the ManageSieve service entirely in the Dovecot configuration (set protocols to exclude managesieve). The vendor advisory references a patch available per the CSAF document, though the exact fixed version number was not included in the analyzed intelligence feed.

More in Ox Dovecot Pro

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CVE-2026-42007 CRITICAL
9.1 Aug 28

Use-after-free in the OX Dovecot Pro and Dovecot CE mail-editing code lets an authenticated user who can install a Sieve
CVE-2026-27851 CRITICAL
9.1 May 12

Authentication-layer injection in OX Dovecot Pro (versions up to and including 2.4.3 and 3.1.4) arises from a flaw in th
CVE-2026-24031 HIGH
8.2 Mar 27

Authentication bypass and user enumeration in OX Dovecot Pro (versions up to and including 3.1.0 and the 2.4.x line up t
CVE-2026-42391 HIGH
7.5 Aug 28

Denial of service in OX Dovecot Pro and OX Dovecot CE allows unauthenticated remote attackers to exhaust memory and CPU

CVE-2026-33605 HIGH
7.5 Aug 28

ManageSieve login process in OX Dovecot CE and Pro crashes on receipt of a small malformed pre-authentication command, e
CVE-2026-27852 HIGH
7.5 Aug 28

Memory exhaustion in OX Dovecot Pro and OX Dovecot CE allows any remote sender to deny IMAP service to a targeted user b
CVE-2026-27858 HIGH
7.5 Mar 27

OX Dovecot Pro managesieve-login process crashes repeatedly due to memory exhaustion triggered by unauthenticated attack
CVE-2026-27857 HIGH
7.5 Mar 27

Remote memory-exhaustion denial of service in OX Dovecot Pro (versions up to and including 2.3.0) lets an unauthenticate
CVE-2026-40018 HIGH
7.4 Aug 28

SQL injection in Open-Xchange OX Dovecot Pro and OX Dovecot CE enables unauthenticated remote attackers, under high-comp
CVE-2026-73208 HIGH
7.4 Aug 28

OAuth2 token validation in OX Dovecot Pro and OX Dovecot CE contains a logic error that permits authentication bypass wh
CVE-2026-73209 MEDIUM
6.5 Aug 28

Stack exhaustion via crafted compressed IMAP data in OX Dovecot Pro and OX Dovecot CE allows an authenticated remote att
CVE-2026-52687 MEDIUM
6.5 Aug 28

IMAP compression in OX Dovecot Pro and OX Dovecot CE allows any authenticated user to exhaust the memory of the imap-log

Same weakness CWE-20 – Improper Input Validation

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CVE-2021-44228 CRITICAL POC
10.0
CVE-2024-3400 CRITICAL POC
10.0
CVE-2022-47966 CRITICAL POC
9.8
CVE-2023-22515 CRITICAL POC
9.8
CVE-2009-0927 HIGH POC
8.8
CVE-2017-9791 CRITICAL POC
9.8
CVE-2017-15944 CRITICAL POC
9.8
CVE-2019-0604 CRITICAL POC
9.8

Same technique Denial Of Service

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CVE-2015-5119 CRITICAL POC
9.8
CVE-2011-2462 CRITICAL POC
9.8
CVE-2011-0611 HIGH POC
8.8
CVE-2012-1889 HIGH POC
8.8
CVE-2012-0507 CRITICAL POC
9.8
CVE-2014-1761 HIGH POC
7.8
CVE-2015-5122 CRITICAL POC
9.8
CVE-2011-0609 HIGH POC
7.8

Vendor StatusVendor

Ubuntu

Priority: Medium
dovecot
Release Status Version
trusty needed -
xenial needed -
bionic needed -
focal needed -
jammy needed -
noble needed -
questing needed -
upstream released 2.4.3

Debian

dovecot
Release Status Fixed Version Urgency
bullseye vulnerable 1:2.3.13+dfsg1-2+deb11u1 -
bullseye (security) vulnerable 1:2.3.13+dfsg1-2+deb11u2 -
bookworm, bookworm (security) vulnerable 1:2.3.19.1+dfsg1-2.1+deb12u1 -
trixie vulnerable 1:2.4.1+dfsg1-6+deb13u3 -
trixie (security) vulnerable 1:2.4.1+dfsg1-6+deb13u1 -
forky, sid vulnerable 1:2.4.2+dfsg1-4 -
(unstable) fixed (unfixed) -

SUSE

Severity: High
Product Status
SUSE Linux Enterprise High Performance Computing 15 SP7 Fixed
SUSE Linux Enterprise High Performance Computing 15 SP7 Fixed
SUSE Linux Enterprise Module for Server Applications 15 SP7 Fixed
SUSE Linux Enterprise Module for Server Applications 15 SP7 Fixed
SUSE Linux Enterprise Server 15 SP7 Fixed

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CVE-2025-59032 vulnerability details – vuln.today
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