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CVE-2026-27858

Quick assessment

Affected
Open-Xchange GmbH OX Dovecot Pro
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Open-Xchange OX Dovecot Pro是德国Open-Xchange公司的一个邮件存储与投递系统。 Open-Xchange OX Dovecot Pro存在安全漏洞，该漏洞源于攻击者可在身份验证前发送特制消息分配大量内存，可能导致进程崩溃。

CVSS 7.5 · High EPSS 1.04% · P63

Affected Version Matrix 3

VendorProduct Version RangeStatus
Open-Xchange GmbH OX Dovecot Pro ≤ 2.3.0 affected
≤ 3.1.0 affected
≤ 2.4.0 affected
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I. Basic Information for CVE-2026-27858

Vulnerability Information
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Vulnerability Title
N/A
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
未加控制的资源消耗(资源穷尽)
Source: CVE Program / CVE List V5
Vulnerability Title
Open-Xchange OX Dovecot Pro 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Open-Xchange OX Dovecot Pro是德国Open-Xchange公司的一个邮件存储与投递系统。 Open-Xchange OX Dovecot Pro存在安全漏洞，该漏洞源于攻击者可在身份验证前发送特制消息分配大量内存，可能导致进程崩溃。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Open-Xchange GmbH OX Dovecot Pro 0 ~ 2.3.0 -

II. Public POCs for CVE-2026-27858

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III. Intelligence Information for CVE-2026-27858

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Same Patch Batch · Open-Xchange GmbH · 2026-03-27 · 11 CVEs total

CVE-2026-24031 7.7 HIGH Open-Xchange OX Dovecot Pro 安全漏洞
CVE-2025-59032 7.5 HIGH Open-Xchange OX Dovecot Pro 安全漏洞
CVE-2026-27856 7.4 HIGH Open-Xchange OX Dovecot Pro 安全漏洞
CVE-2026-27855 6.8 MEDIUM Open-Xchange OX Dovecot Pro 安全漏洞
CVE-2026-0394 5.3 MEDIUM Open-Xchange OX Dovecot Pro 安全漏洞
CVE-2026-27859 5.3 MEDIUM Open-Xchange OX Dovecot Pro 安全漏洞
CVE-2025-59028 5.3 MEDIUM Open-Xchange OX Dovecot Pro 安全漏洞
CVE-2026-27857 4.3 MEDIUM Open-Xchange OX Dovecot Pro 安全漏洞
CVE-2025-59031 4.3 MEDIUM Open-Xchange OX Dovecot Pro 安全漏洞
CVE-2026-27860 3.7 LOW Open-Xchange OX Dovecot Pro 安全漏洞

IV. Related Vulnerabilities

Same product: OX Dovecot Pro
Same vendor: Open-Xchange GmbH
Same weakness: CWE-400

V. Comments for CVE-2026-27858

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