CVE-2026-33604
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 Dovecot Pro是德国Open-Xchange公司的一个邮件服务器软件。 Open-Xchange Dovecot Pro 2.3.0版本至2.3.22.2之前版本、3.0.0版本至3.0.7之前版本和3.1.0版本至3.1.6之前版本存在安全漏洞，该漏洞源于对消息正文中精心构造的行尾处理不当，可能绕过出站保护，导致下游邮件服务器将部分消息正文解释为新的SMTP命令，从而注入伪造电子邮件。
Possible ATT&CK Techniques 2 AI
T1010 · Application Window Discovery T1030 · Data Transfer Size LimitsAffected Version Matrix 4
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| Open-Xchange GmbH | OX Dovecot CE | 2.3.0< 2.4.5 |
affected |
| Open-Xchange GmbH | OX Dovecot Pro | 2.3.0< 2.3.22.2 |
affected |
3.0.0< 3.0.7 |
affected | ||
3.1.0< 3.1.6 |
affected |
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I. Basic Information for CVE-2026-33604
Vulnerability Information
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Vulnerability Title
N/A
Source: CVE Program / CVE List V5
Vulnerability Description
An attacker that can get Dovecot to relay a message, for example through Sieve redirect or submission relay, can use a crafted line ending in the message body to bypass the outbound protection that prevents message content from being interpreted as SMTP commands. A downstream mail server that hasn't yet fixed the SMTP smuggling vulnerability can be tricked into treating part of the message body as new SMTP commands, allowing injection of spoofed email. This is the same vulnerability class as CVE-2023-51764 and CVE-2023-51766. Where you control the receiving mail servers, ensure they reject bare carriage returns in message data. Update to non-vulnerable version. No publicly available exploits are known.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
不充分的心理学可接受性
Source: CVE Program / CVE List V5
Vulnerability Title
Open-Xchange Dovecot Pro 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Open-Xchange Dovecot Pro是德国Open-Xchange公司的一个邮件服务器软件。 Open-Xchange Dovecot Pro 2.3.0版本至2.3.22.2之前版本、3.0.0版本至3.0.7之前版本和3.1.0版本至3.1.6之前版本存在安全漏洞，该漏洞源于对消息正文中精心构造的行尾处理不当，可能绕过出站保护，导致下游邮件服务器将部分消息正文解释为新的SMTP命令，从而注入伪造电子邮件。
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 | 2.3.0 ~ 2.3.22.2 | - |
|
| Open-Xchange GmbH | OX Dovecot CE | 2.3.0 ~ 2.4.5 | - |
|
II. Public POCs for CVE-2026-33604
| # | POC Description | Source Link | Shenlong Link |
|---|
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Same Patch Batch · Open-Xchange GmbH · 2026-08-28 · 25 CVEs total
| CVE-2026-42007 | 9.1 CRITICAL | Open-Xchange Dovecot Pro 资源管理错误漏洞 |
| CVE-2026-42391 | 7.5 HIGH | Open-Xchange Dovecot Pro 资源管理错误漏洞 |
| CVE-2026-33605 | 7.5 HIGH | Open-Xchange Dovecot Pro 资源管理错误漏洞 |
| CVE-2026-27852 | 7.5 HIGH | Open-Xchange Dovecot Pro 资源管理错误漏洞 |
| CVE-2026-40018 | 7.4 HIGH | Open-Xchange Dovecot Pro SQL注入漏洞 |
| CVE-2026-73208 | 7.4 HIGH | Open-Xchange Dovecot Pro 授权问题漏洞 |
| CVE-2026-52687 | 6.5 MEDIUM | Open-Xchange Dovecot Pro 资源管理错误漏洞 |
| CVE-2026-73209 | 6.5 MEDIUM | Open-Xchange Dovecot Pro 资源管理错误漏洞 |
| CVE-2026-40014 | 6.5 MEDIUM | Open-Xchange Dovecot Pro 资源管理错误漏洞 |
| CVE-2026-40017 | 6.5 MEDIUM | Open-Xchange Dovecot Pro 资源管理错误漏洞 |
| CVE-2026-40019 | 5.9 MEDIUM | Open-Xchange GmbH OX Dovecot CE 资源管理错误漏洞 |
| CVE-2026-40205 | 5.9 MEDIUM | Open-Xchange Dovecot Pro 授权问题漏洞 |
| CVE-2026-33606 | 4.8 MEDIUM | Open-Xchange Dovecot Pro 输入验证错误漏洞 |
| CVE-2026-42008 | 4.3 MEDIUM | Open-Xchange Dovecot Pro 授权问题漏洞 |
| CVE-2026-33607 | 4.3 MEDIUM | Open-Xchange Dovecot Pro 资源管理错误漏洞 |
| CVE-2026-33263 | 4.3 MEDIUM | Open-Xchange Dovecot Pro 资源管理错误漏洞 |
| CVE-2026-40015 | 4.3 MEDIUM | Open-Xchange Dovecot Pro 缓冲区错误漏洞 |
| CVE-2026-40013 | 4.3 MEDIUM | Open-Xchange Dovecot Pro 缓冲区错误漏洞 |
| CVE-2026-42392 | 4.3 MEDIUM | Open-Xchange Dovecot Pro 信息泄露漏洞 |
| CVE-2026-42395 | 4.3 MEDIUM | Open-Xchange Dovecot Pro 资源管理错误漏洞 |
Showing top 20 of 25 CVEs. View all on vendor page → →
IV. Related Vulnerabilities
V. Comments for CVE-2026-33604
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