CVE-2026-33603: medium-severity vulnerability in Open-Xchange GmbH OX Dovecot Pro
Published
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13Vexday Risk Score
No sign of exploitation. No public exploitation artifact known so far.
ssvc Trackcvss 6.8epss 0.2%
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.
CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
Affected products
Open-Xchange GmbH · OX Dovecot ProRelated CVEs — Open-Xchange GmbH OX Dovecot Pro
In the same product, most dangerous first.