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CVE-2026-33603

medium CVSS 6.8 EPSS 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.

Versions it affects

Software versions checked with the free lookup that CVE-2026-33603 applies to, and the release that fixes it where the sources name one.

Dovecot 2.2.36

At a glance

Severity
Medium
CVSS base score
6.8 out of 10
Known exploited
Not in CISA's catalogue of exploited vulnerabilities
EPSS
0.2% probability of exploitation in the next 30 days, higher than 12% of scored vulnerabilities
Weakness
CWE-99
Published
2026-05-12
NVD CVE.org

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