CVE-2026-33603

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Summary

CVECVE-2026-33603
StatePUBLISHED
AssignerOX
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-05-12 14:17:01 UTC
Updated2026-05-18 17:35:35 UTC
DescriptionAttacker 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.

Risk And Classification

Primary CVSS: v3.1 5.3 MEDIUM from [email protected]

CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N

EPSS: 0.000080000 probability, percentile 0.007470000 (date 2026-05-26)

Problem Types: CWE-99 | CWE-99 Improper Control of Resource Identifiers ('Resource Injection')

VersionSourceTypeScoreSeverityVector
3.1[email protected]Primary5.3MEDIUMCVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N
3.1[email protected]Secondary6.8MEDIUMCVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
3.1CNACVSS6.8MEDIUMCVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N

CVSS v3.1 Breakdown

Attack Vector
Adjacent
Attack Complexity
High
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
None
Availability
None

CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Application Dovecot Dovecot All All All All
Application Open-xchange Dovecot All All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Open-Xchange GmbH OX Dovecot Pro affected 3.1.0 semver Not specified
CNA Open-Xchange GmbH OX Dovecot Pro affected 2.4.0 semver Not specified

References

ReferenceSourceLinkTags
documentation.open-xchange.com/dovecot/security/advisories/csaf/2026/oxdc-adv-2026-0002.json [email protected] documentation.open-xchange.com Vendor Advisory
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis
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