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6 vulnerabilities found for OX Dovecot Pro by Open-Xchange GmbH
CVE-2025-30189 (GCVE-0-2025-30189)
Vulnerability from nvd
Published
2025-10-31 09:02
Modified
2025-11-04 21:09
Severity ?
VLAI Severity ?
EPSS score ?
CWE
- CWE-1250 - Improper Preservation of Consistency Between Independent Representations of Shared State
Summary
When cache is enabled, some passdb/userdb drivers incorrectly cache all users with same cache key, causing wrong cached information to be used for these users. After cached login, all subsequent logins are for same user. Install fixed version or disable caching either globally or for the impacted passdb/userdb drivers. No publicly available exploits are known.
References
| URL | Tags | |
|---|---|---|
Impacted products
| Vendor | Product | Version | ||
|---|---|---|---|---|
| Open-Xchange GmbH | OX Dovecot Pro |
Version: 0 ≤ 2.4.0 |
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CVE-2024-23185 (GCVE-0-2024-23185)
Vulnerability from nvd
Published
2024-09-10 14:38
Modified
2025-11-04 16:11
Severity ?
VLAI Severity ?
EPSS score ?
CWE
- CWE-770 - Allocation of Resources Without Limits or Throttling
Summary
Very large headers can cause resource exhaustion when parsing message. The message-parser normally reads reasonably sized chunks of the message. However, when it feeds them to message-header-parser, it starts building up "full_value" buffer out of the smaller chunks. The full_value buffer has no size limit, so large headers can cause large memory usage. It doesn't matter whether it's a single long header line, or a single header split into multiple lines. This bug exists in all Dovecot versions. Incoming mails typically have some size limits set by MTA, so even largest possible header size may still fit into Dovecot's vsz_limit. So attackers probably can't DoS a victim user this way. A user could APPEND larger mails though, allowing them to DoS themselves (although maybe cause some memory issues for the backend in general). One can implement restrictions on headers on MTA component preceding Dovecot. No publicly available exploits are known.
References
| URL | Tags | |
|---|---|---|
Impacted products
| Vendor | Product | Version | ||
|---|---|---|---|---|
| Open-Xchange GmbH | OX Dovecot Pro |
Version: 0 ≤ 2.3.21 |
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CVE-2024-23184 (GCVE-0-2024-23184)
Vulnerability from nvd
Published
2024-09-10 14:33
Modified
2025-11-04 16:11
Severity ?
VLAI Severity ?
EPSS score ?
CWE
- CWE-770 - Allocation of Resources Without Limits or Throttling
Summary
Having a large number of address headers (From, To, Cc, Bcc, etc.) becomes excessively CPU intensive. With 100k header lines CPU usage is already 12 seconds, and in a production environment we observed 500k header lines taking 18 minutes to parse. Since this can be triggered by external actors sending emails to a victim, this is a security issue. An external attacker can send specially crafted messages that consume target system resources and cause outage. One can implement restrictions on address headers on MTA component preceding Dovecot. No publicly available exploits are known.
References
| URL | Tags | |
|---|---|---|
Impacted products
| Vendor | Product | Version | ||
|---|---|---|---|---|
| Open-Xchange GmbH | OX Dovecot Pro |
Version: 0 ≤ 2.3.21 |
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CVE-2025-30189 (GCVE-0-2025-30189)
Vulnerability from cvelistv5
Published
2025-10-31 09:02
Modified
2025-11-04 21:09
Severity ?
VLAI Severity ?
EPSS score ?
CWE
- CWE-1250 - Improper Preservation of Consistency Between Independent Representations of Shared State
Summary
When cache is enabled, some passdb/userdb drivers incorrectly cache all users with same cache key, causing wrong cached information to be used for these users. After cached login, all subsequent logins are for same user. Install fixed version or disable caching either globally or for the impacted passdb/userdb drivers. No publicly available exploits are known.
References
| URL | Tags | |
|---|---|---|
Impacted products
| Vendor | Product | Version | ||
|---|---|---|---|---|
| Open-Xchange GmbH | OX Dovecot Pro |
Version: 0 ≤ 2.4.0 |
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CVE-2024-23185 (GCVE-0-2024-23185)
Vulnerability from cvelistv5
Published
2024-09-10 14:38
Modified
2025-11-04 16:11
Severity ?
VLAI Severity ?
EPSS score ?
CWE
- CWE-770 - Allocation of Resources Without Limits or Throttling
Summary
Very large headers can cause resource exhaustion when parsing message. The message-parser normally reads reasonably sized chunks of the message. However, when it feeds them to message-header-parser, it starts building up "full_value" buffer out of the smaller chunks. The full_value buffer has no size limit, so large headers can cause large memory usage. It doesn't matter whether it's a single long header line, or a single header split into multiple lines. This bug exists in all Dovecot versions. Incoming mails typically have some size limits set by MTA, so even largest possible header size may still fit into Dovecot's vsz_limit. So attackers probably can't DoS a victim user this way. A user could APPEND larger mails though, allowing them to DoS themselves (although maybe cause some memory issues for the backend in general). One can implement restrictions on headers on MTA component preceding Dovecot. No publicly available exploits are known.
References
| URL | Tags | |
|---|---|---|
Impacted products
| Vendor | Product | Version | ||
|---|---|---|---|---|
| Open-Xchange GmbH | OX Dovecot Pro |
Version: 0 ≤ 2.3.21 |
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"value": "Very large headers can cause resource exhaustion when parsing message. The message-parser normally reads reasonably sized chunks of the message. However, when it feeds them to message-header-parser, it starts building up \"full_value\" buffer out of the smaller chunks. The full_value buffer has no size limit, so large headers can cause large memory usage. It doesn\u0027t matter whether it\u0027s a single long header line, or a single header split into multiple lines. This bug exists in all Dovecot versions. Incoming mails typically have some size limits set by MTA, so even largest possible header size may still fit into Dovecot\u0027s vsz_limit. So attackers probably can\u0027t DoS a victim user this way. A user could APPEND larger mails though, allowing them to DoS themselves (although maybe cause some memory issues for the backend in general). One can implement restrictions on headers on MTA component preceding Dovecot. No publicly available exploits are known."
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CVE-2024-23184 (GCVE-0-2024-23184)
Vulnerability from cvelistv5
Published
2024-09-10 14:33
Modified
2025-11-04 16:11
Severity ?
VLAI Severity ?
EPSS score ?
CWE
- CWE-770 - Allocation of Resources Without Limits or Throttling
Summary
Having a large number of address headers (From, To, Cc, Bcc, etc.) becomes excessively CPU intensive. With 100k header lines CPU usage is already 12 seconds, and in a production environment we observed 500k header lines taking 18 minutes to parse. Since this can be triggered by external actors sending emails to a victim, this is a security issue. An external attacker can send specially crafted messages that consume target system resources and cause outage. One can implement restrictions on address headers on MTA component preceding Dovecot. No publicly available exploits are known.
References
| URL | Tags | |
|---|---|---|
Impacted products
| Vendor | Product | Version | ||
|---|---|---|---|---|
| Open-Xchange GmbH | OX Dovecot Pro |
Version: 0 ≤ 2.3.21 |
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