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CVE-2026-33603

6.8 MEDIUM

Attacker can use a specially crafted base64 exchange between Dovecot and Client to fake SCRAM TLS channel binding

Published: 2026-05-12 · Last updated: 2026-05-18

Severity and scoring

CVSS
6.8 MEDIUM
Vector
CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
CWE
CWE-99

Affected products

VendorProduct
dovecotdovecot
open-xchangedovecot

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

References

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