CVE-2026-27859
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。 OX Dovecot Pro存在安全漏洞，该漏洞源于包含过多RFC 2231 MIME参数的邮件消息可能导致CPU使用过高，可能导致拒绝服务攻击。
Possible ATT&CK Techniques 1 AI
T1496 · Resource Hijacking
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I. Basic Information for CVE-2026-27859
Vulnerability Information
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Vulnerability Title
N/A
Source: CVE Program / CVE List V5
Vulnerability Description
A mail message containing excessive amount of RFC 2231 MIME parameters causes LMTP to use too much CPU. A suitably formatted mail message causes mail delivery process to consume large amounts of CPU time. Use MTA capabilities to limit RFC 2231 MIME parameters in mail messages, or upgrade to fixed version where the processing is limited. 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:L
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。 OX Dovecot Pro存在安全漏洞，该漏洞源于包含过多RFC 2231 MIME参数的邮件消息可能导致CPU使用过高，可能导致拒绝服务攻击。
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 ~ 3.0.2 | - |
|
II. Public POCs for CVE-2026-27859
| # | POC Description | Source Link | Shenlong Link |
|---|
AI-Generated POC
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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-2026-27858 | 7.5 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-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 |
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V. Comments for CVE-2026-27859
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