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Ox Dovecot Pro CVE-2026-27858

| EUVDEUVD-2026-16569 HIGH
Uncontrolled Resource Consumption (CWE-400)
2026-03-27 OX
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-2026-16569
Analysis Generated
Mar 27, 2026 - 08:30 vuln.today
CVE Published
Mar 27, 2026 - 08:10 nvd
HIGH 7.5

DescriptionCVE.org

Attacker can send a specifically crafted message before authentication that causes managesieve to allocate large amount of memory. Attacker can force managesieve-login to be unavailable by repeatedly crashing the process. Protect access to managesieve protocol, or install fixed version. No publicly available exploits are known.

AnalysisAI

OX Dovecot Pro managesieve-login process crashes repeatedly due to memory exhaustion triggered by unauthenticated attackers sending crafted messages. The vulnerability enables remote denial of service against the managesieve protocol without authentication (CVSS:3.1/AV:N/AC:L/PR:N/UI:N), with a CVSS score of 7.5 (High severity). No public exploit identified at time of analysis, and the vendor has released a security advisory with remediation guidance.

Technical ContextAI

The vulnerability affects the managesieve protocol implementation in OX Dovecot Pro, identified by CPE cpe:2.3:a:open-xchange_gmbh:ox_dovecot_pro. Managesieve (RFC 5804) is a protocol for remotely managing Sieve mail filtering scripts on a mail server. The flaw is classified as CWE-400 (Uncontrolled Resource Consumption), indicating the managesieve-login process fails to properly validate or limit memory allocation when processing specially crafted messages during the pre-authentication phase. This allows attackers to exhaust available memory resources before any authentication checks occur, making the service unavailable through repeated process crashes.

RemediationAI

Install 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 (exact patch version details available in the CSAF advisory). As an interim mitigation measure, restrict network access to the managesieve protocol (typically port 4190) using firewall rules or access control lists to limit exposure to trusted IP ranges only. Organizations not actively using Sieve script management should disable the managesieve service entirely until patching is completed. The advisory notes that no publicly available exploits are known, providing a reasonable window for controlled deployment of patches.

More in Ox Dovecot Pro

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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-2026-42007 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-2026-24031 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-2025-59032 HIGH
7.5 Mar 27

OX Dovecot Pro ManageSieve service crashes when processing AUTHENTICATE commands with SASL initial responses using liter
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-2026-42391 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-2026-73208 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-2026-40018 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-2026-73209 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-400 – Uncontrolled Resource Consumption

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CVE-2023-44487 HIGH POC
7.5
CVE-2026-45498 HIGH POC
7.5
CVE-2016-8610 HIGH
7.5
CVE-2026-28318 HIGH POC
7.5
CVE-2023-38180 HIGH
7.5
CVE-2025-26673 HIGH
7.5
CVE-2015-7978 HIGH
7.5
CVE-2025-27473 HIGH
7.5

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-2026-27858 vulnerability details – vuln.today
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