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CVE-2026-33603

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。

CVSS 6.8 · Medium EPSS 0.23% · P13

Affected Version Matrix 2

VendorProduct Version RangeStatus
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: CVE Program / CVE List V5
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: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
对资源描述符的控制不恰当(资源注入)
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

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III. Intelligence Information for CVE-2026-33603

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Vendor Advisories for CVE-2026-33603 (1)

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

IV. Related Vulnerabilities

Same product: OX Dovecot Pro
Same vendor: Open-Xchange GmbH
Same weakness: CWE-99

V. Comments for CVE-2026-33603

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