CVE-2026-33603
Affected Version Matrix 2
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| Open-Xchange GmbH | OX Dovecot Pro | ≤ 3.1.0 | affected |
≤ 2.4.0 | affected |
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I. Basic Information for CVE-2026-33603
Vulnerability Information
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Vulnerability Title
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Description
Attacker can use a specially crafted base64 exchange between Dovecot and Client to fake SCRAM TLS channel binding. This requires that the attacker is able to position itself between Dovecot and the client connection. If successful, the attacker can eavesdrop communications between Dovecot and client as MITM proxy. Install fixed version. No publicly available exploits are known.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
Source: NVD (National Vulnerability Database)
Vulnerability Type
对资源描述符的控制不恰当(资源注入)
Source: NVD (National Vulnerability Database)
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以使用特制的base64交换伪造SCRAM TLS通道绑定，可能导致中间人攻击窃听通信。
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 ~ 3.1.0 | - |
II. Public POCs for CVE-2026-33603
| # | POC Description | Source Link | Shenlong Link |
|---|
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No public POC found.
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Same Patch Batch · Open-Xchange GmbH · 2026-05-12 · 5 CVEs total
| CVE-2026-27851 | 7.4 HIGH | Open-Xchange OX Dovecot Pro 安全漏洞 |
| CVE-2026-40016 | 5.3 MEDIUM | Open-Xchange OX Dovecot Pro 资源管理错误漏洞 |
| CVE-2026-42006 | 4.3 MEDIUM | Open-Xchange OX Dovecot Pro 资源管理错误漏洞 |
| CVE-2026-40020 | 3.1 LOW | Open-Xchange OX Dovecot Pro 访问控制错误漏洞 |
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V. Comments for CVE-2026-33603
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