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Search Results (304 CVEs found)
| CVE | Vendors | Products | Updated | CVSS v3.1 |
|---|---|---|---|---|
| CVE-2026-42395 | 1 Open-xchange | 2 Ox Dovecot Ce, Ox Dovecot Pro | 2026-09-01 | 4.3 Medium |
| A host listed as a trusted proxy can send forwarding information containing a NUL byte, which crashes the login process on the following login attempt. The login process is terminated, which can cause degradation or denial of service for logins. Deployments that do not configure trusted proxies are not affected. Restrict the list of trusted proxy networks to hosts that are fully under your control. Update to non-vulnerable version. No publicly available exploits are known. | ||||
| CVE-2026-52681 | 1 Open-xchange | 2 Ox Dovecot Ce, Ox Dovecot Pro | 2026-09-01 | 3.1 Low |
| Sieve CPU resource usage is tracked in the compiled script, so an attacker that has valid credentials can reset the accounting by repeatedly changing the active script. Compiled script files are also not removed when a script is deleted or renamed. The configured Sieve CPU limit can be bypassed, allowing sustained CPU consumption, and the leftover files increase disk consumption. Both can cause degradation of service for mail delivery. Monitor system for abnormal CPU usage and disk consumption. Update to non-vulnerable version. No publicly available exploits are known. | ||||
| CVE-2026-52687 | 1 Open-xchange | 2 Ox Dovecot Ce, Ox Dovecot Pro | 2026-09-01 | 6.5 Medium |
| An attacker that has valid credentials can select a compression algorithm for the IMAP connection whose decompression state requires a large amount of memory, and open several such connections. The memory limit of the process is reached with only a few connections, terminating the process and all connections it handles, which can cause degradation or denial of service for IMAP. Disable IMAP compression. Alternatively limit the number of connections handled by a single imap-login process, though this has a performance impact. Update to non-vulnerable version. No publicly available exploits are known. | ||||
| CVE-2026-73208 | 1 Open-xchange | 2 Ox Dovecot Ce, Ox Dovecot Pro | 2026-09-01 | 7.4 High |
| An attacker that holds a token intended for a different purpose can authenticate, because when an OAuth2 token response does not contain a scope claim, the audience claim is used in its place and checked against the configured required scopes. These are different concepts, and the audience claim does not describe what a token is allowed to do. A token that grants no relevant permissions can be accepted because its intended recipient value happens to match a configured scope name, granting access that should have been denied. It also hides an identity provider misconfiguration where scopes are not being issued at all. Ensure the identity provider issues a scope claim for all tokens used with Dovecot, and that configured scope names do not match audience values. Update to non-vulnerable version. No publicly available exploits are known. | ||||
| CVE-2026-73209 | 1 Open-xchange | 2 Ox Dovecot Ce, Ox Dovecot Pro | 2026-09-01 | 6.5 Medium |
| An attacker that has valid credentials can send crafted compressed data that causes the affected process to exhaust its stack and crash. The affected process is terminated, which can cause degradation or denial of service for IMAP. Update to non-vulnerable version. No publicly available exploits are known. | ||||
| CVE-2026-27851 | 2 Dovecot, Open-xchange | 3 Dovecot, Dovecot, Ox Dovecot Pro | 2026-08-14 | 7.4 High |
| When safe filter is used with variable expansion, all following pipelines on the same string are incorrectly interpreted as safe too, enabling unsafe data to be unescaped. This can enable SQL / LDAP injection attacks when used in authentication. Avoid using safe filter until on fixed version. No publicly available exploits are known. | ||||
| CVE-2026-42006 | 2 Dovecot, Open-xchange | 3 Dovecot, Dovecot, Ox Dovecot Pro | 2026-08-14 | 4.3 Medium |
| An attacker can cause uncontrolled memory usage with excessive bracing over IMAP. The fix in CVE-2026-27857 was incomplete, only blocking one way of doing this, so there was still another way left open. In particular, the fix was for closing braces, but you could still use open braces to bypass the limit. Using excessive bracing, attacker can cause memory usage up to configured memory limit. Install fixed version, or configure vsz_limit for imap process to low value. No publicly available exploits are known. | ||||
| CVE-2026-24031 | 2 Dovecot, Open-xchange | 3 Dovecot, Dovecot, Ox Dovecot Pro | 2026-06-30 | 7.7 High |
| Dovecot SQL based authentication can be bypassed when auth_username_chars is cleared by admin. This vulnerability allows bypassing authentication for any user and user enumeration. Do not clear auth_username_chars. If this is not possible, install latest fixed version. No publicly available exploits are known. | ||||
| CVE-2026-40020 | 2 Dovecot, Open-xchange | 3 Dovecot, Dovecot, Ox Dovecot Pro | 2026-05-18 | 3.1 Low |
| Attacker can use the IMAP SETACL command to inject the anyone permission to user's dovecot-acl file even if imap_acl_allow_anyone=no. This causes folders to be spammed to all users. The impact is limited to being able to spam folders to other users, no unexpected access is gained. Install to fixed version. No publicly available exploits are known. | ||||
| CVE-2026-33603 | 2 Dovecot, Open-xchange | 3 Dovecot, Dovecot, Ox Dovecot Pro | 2026-05-18 | 6.8 Medium |
| 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. | ||||
| CVE-2026-40016 | 2 Dovecot, Open-xchange | 3 Dovecot, Dovecot, Ox Dovecot Pro | 2026-05-18 | 5.3 Medium |
| Attacker can upload a malicious Sieve script over ManageSieve service (or locally) to bypass configured CPU time limits for Sieve up to 130 times of the configured limit. Attacker can use this to degrade server performance and bypass configured CPU time limits for Sieve scripts. Install fixed version, or alternatively prevent direct access to Sieve scripts via ManageSieve or local access. No publicly available exploits are known. | ||||
| CVE-2024-4367 | 4 Debian, Mozilla, Open-xchange and 1 more | 10 Debian Linux, Firefox, Firefox Esr and 7 more | 2026-05-12 | 5.6 Medium |
| A type check was missing when handling fonts in PDF.js, which would allow arbitrary JavaScript execution in the PDF.js context. This vulnerability affects Firefox < 126, Firefox ESR < 115.11, and Thunderbird < 115.11. | ||||
| CVE-2025-59028 | 2 Dovecot, Open-xchange | 3 Dovecot, Dovecot, Ox Dovecot Pro | 2026-04-30 | 5.3 Medium |
| When sending invalid base64 SASL data, login process is disconnected from the auth server, causing all active authentication sessions to fail. Invalid BASE64 data can be used to DoS a vulnerable server to break concurrent logins. Install fixed version or disable concurrency in login processes (heavy perfomance penalty on large deployments). No publicly available exploits are known. | ||||
| CVE-2025-59032 | 2 Dovecot, Open-xchange | 3 Dovecot, Dovecot, Ox Dovecot Pro | 2026-04-30 | 7.5 High |
| ManageSieve AUTHENTICATE command crashes when using literal as SASL initial response. This can be used to crash ManageSieve service repeatedly, making it unavailable for other users. Control access to ManageSieve port, or disable the service if it's not needed. Alternatively upgrade to a fixed version. No publicly available exploits are known. | ||||
| CVE-2026-27857 | 2 Dovecot, Open-xchange | 3 Dovecot, Dovecot, Ox Dovecot Pro | 2026-04-30 | 4.3 Medium |
| Sending "NOOP (((...)))" command with 4000 parenthesis open+close results in ~1MB extra memory usage. Longer commands will result in client disconnection. This 1 MB can be left allocated for longer time periods by not sending the command ending LF. So attacker could connect possibly from even a single IP and create 1000 connections to allocate 1 GB of memory, which would likely result in reaching VSZ limit and killing the process and its other proxied connections. Attacker could connect possibly from even a single IP and create 1000 connections to allocate 1 GB of memory, which would likely result in reaching VSZ limit and killing the process and its other proxied connections. Install fixed version, there is no other remediation. No publicly available exploits are known. | ||||
| CVE-2026-27858 | 2 Dovecot, Open-xchange | 3 Dovecot, Dovecot, Ox Dovecot Pro | 2026-04-30 | 7.5 High |
| Attacker can send a specifically crafted message before authentication that causes managesieve to allocate large amount of memory. Attacker can force managesieve-login to be unavailable by repeatedly crashing the process. Protect access to managesieve protocol, or install fixed version. No publicly available exploits are known. | ||||
| CVE-2026-27859 | 2 Dovecot, Open-xchange | 3 Dovecot, Dovecot, Ox Dovecot Pro | 2026-04-30 | 5.3 Medium |
| A mail message containing excessive amount of RFC 2231 MIME parameters causes LMTP to use too much CPU. A suitably formatted mail message causes mail delivery process to consume large amounts of CPU time. Use MTA capabilities to limit RFC 2231 MIME parameters in mail messages, or upgrade to fixed version where the processing is limited. No publicly available exploits are known. | ||||
| CVE-2026-0394 | 2 Dovecot, Open-xchange | 3 Dovecot, Dovecot, Ox Dovecot Pro | 2026-04-29 | 5.3 Medium |
| When dovecot has been configured to use per-domain passwd files, and they are placed one path component above /etc, or slash has been added to allowed characters, path traversal can happen if the domain component is directory partial. This allows inadvertently reading /etc/passwd (or some other path which ends with passwd). If this file contains passwords, it can be used to authenticate wrongly, or if this is userdb, it can unexpectly make system users appear valid users. Upgrade to fixed version, or use different authentication scheme that does not rely on paths. Alternatively you can also ensure that the per-domain passwd files are in some other location, such as /etc/dovecot/auth/%d. No publicly available exploits are known. | ||||
| CVE-2026-27860 | 2 Dovecot, Open-xchange | 3 Dovecot, Dovecot, Ox Dovecot Pro | 2026-04-29 | 3.7 Low |
| If auth_username_chars is empty, it is possible to inject arbitrary LDAP filter to Dovecot's LDAP authentication. This leads to potentially bypassing restrictions and allows probing of LDAP structure. Do not clear out auth_username_chars, or install fixed version. No publicly available exploits are known. | ||||
| CVE-2026-27856 | 2 Dovecot, Open-xchange | 3 Dovecot, Dovecot, Ox Dovecot Pro | 2026-04-29 | 7.4 High |
| Doveadm credentials are verified using direct comparison which is susceptible to timing oracle attack. An attacker can use this to determine the configured credentials. Figuring out the credential will lead into full access to the affected component. Limit access to the doveadm http service port, install fixed version. No publicly available exploits are known. | ||||