CVE-2026-33603

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.

Scoring

Severity
MEDIUM
CVSS base score
6.8
CVSS vector
CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
EPSS probability
0.21%
CWE
CWE-99
Published
2026-05-12
Last modified
2026-05-12

Affected products

Weakness type

Related vulnerabilities

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