CISA ADP Vulnrichment

Answer in brief

CVE-2026-33604 records a Unknown severity vulnerability in CISA ADP Vulnrichment. The current sources do not mark it as known exploited. The current feed maps Open-Xchange GmbH/OX Dovecot CE (generic), Open-Xchange GmbH/OX Dovecot Pro (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Aug 28, 2026Updated Aug 28, 2026Source checked Aug 28, 2026First seen by HOL Aug 28, 2026Material review Aug 28, 2026

Upstream Advisory

Key facts

Risk: Unknown severitySource severity not reported
Exploitation: Not marked as known exploited
Affected software: 2 mapped packages or products
Fix availability: Available

Why this deserves its current priority

A CVSS score is not reported in the current record. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps Open-Xchange GmbH/OX Dovecot CE (generic), Open-Xchange GmbH/OX Dovecot Pro (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
Open-Xchange GmbH/OX Dovecot CEgeneric	>=2.3.0 <2.4.5	2.4.5
Open-Xchange GmbH/OX Dovecot Progeneric	>=2.3.0 <2.3.22.2 \|\| >=3.0.0 <3.0.7 \|\| >=3.1.0 <3.1.6	2.3.22.2, 3.0.7, 3.1.6

Recommended response

Check inventory. Check lockfiles and deployed manifests for Open-Xchange GmbH/OX Dovecot CE, Open-Xchange GmbH/OX Dovecot Pro.
Review the reported fix. Update Open-Xchange GmbH/OX Dovecot CE to 2.4.5; Open-Xchange GmbH/OX Dovecot Pro to 2.3.22.2 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

Published upstream
Aug 28, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Aug 28, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Aug 28, 2026

Sources and claim methodology

Source referencedocumentation.open-xchange.com

Upstream source description

An attacker that can get Dovecot to relay a message, for example through Sieve redirect or submission relay, can use a crafted line ending in the message body to bypass the outbound protection that prevents message content from being interpreted as SMTP commands. A downstream mail server that hasn't yet fixed the SMTP smuggling vulnerability can be tricked into treating part of the message body as new SMTP commands, allowing injection of spoofed email. This is the same vulnerability class as CVE-2023-51764 and CVE-2023-51766. Where you control the receiving mail servers, ensure they reject bare carriage returns in message data. Update to non-vulnerable version. No publicly available exploits are known.

Quoted source text, attributed separately from HOL analysis.