# CVE-2026-33603

## Summary

- **CVE ID:** CVE-2026-33603
- **Severity:** MEDIUM
- **CVSS Score:** 6.8 (CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N)
- **CWE:** CWE-99
- **Published:** May 12, 2026
- **Last Modified:** May 12, 2026

## 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.

## Affected Products

- Open-Xchange GmbH — OX Dovecot Pro (0)

## References

- [CNA](https://documentation.open-xchange.com/dovecot/security/advisories/csaf/2026/oxdc-adv-2026-0002.json)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.21%
- **EPSS Percentile:** 11.7

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-10._