CVE-2026-33603

medium Red Hat
CVSS v3 Base Score
6.8
CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
EPSS Score
0.0%
Exploitation probability in 30 days
Top 99% most likely to be exploited
Attack Characteristics
Attack Vector
Adjacent
Attack Complexity
High
Privileges Required
None
User Interaction
None
Confidentiality
High
Integrity
High
Availability
None
Published: May 12, 2026 (58 days ago)
Last Modified: May 12, 2026
Vendor: Red Hat
Source: REDHAT

Description

A flaw was found in Dovecot. An attacker, positioned as a Man-in-the-Middle (MITM) between Dovecot and a client, can exploit a specially crafted base64 exchange to fake SCRAM TLS channel binding. This allows the attacker to eavesdrop on communications between Dovecot and the client, leading to information disclosure.

CWE

CWE-940

Affected Products

Red Hat Enterprise Linux 10Red Hat Enterprise Linux 6Red Hat Enterprise Linux 8Red Hat Enterprise Linux 9

References

🔗 bugzilla.redhat.com 🔗 www.cve.org 🔗 nvd.nist.gov 🔗 documentation.open-xchange.com