🛡️ CVE-2026-33603
🟡 CVSS 6.8 — Medium ✅ No Known Exploit CWE-99 NVD
6.8
CVSS Score
0 Low4 Medium7 High9 Critical10

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.

Details

Severity MEDIUM
CVSS Score 6.8
CVSS Vector CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
CWE CWE-99
Public Exploit ✅ No
Source NVD
Published 2026-05-12
Updated 2026-06-02
Modified 2026-05-18
Fix URL N/A

Affected Packages

Software From version Fixed in
dovecot 3.1.5
unknown

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