41
CVEs
2
Critical
9
High
0
KEV
1
PoC
0
Unpatched C/H
100.0%
Patch Rate
0.2%
Avg EPSS
Severity Breakdown
CRITICAL
2
HIGH
9
MEDIUM
24
LOW
6
Monthly CVE Trend
Affected Products (3)
Top Risky CVEs
| CVE | Summary | Severity | CVSS | EPSS | Priority | Signals |
|---|---|---|---|---|---|---|
| CVE-2026-42007 | Use-after-free in the OX Dovecot Pro and Dovecot CE mail-editing code lets an authenticated user who can install a Sieve filter with the editheader extension corrupt memory during mail delivery, leaking out-of-bounds buffer contents into the delivered message and potentially crashing or executing code in the delivery process. The flaw is remotely reachable with low-privilege credentials (CVSS 9.1, scope-changed) and combines information disclosure with a denial-of-service and possible RCE. No public exploit is identified at time of analysis and it is not on CISA KEV, so risk is currently theoretical but severe. | CRITICAL | 9.1 | 0.3% | 46 |
|
| CVE-2026-27851 | Authentication-layer injection in OX Dovecot Pro (versions up to and including 2.4.3 and 3.1.4) arises from a flaw in the 'safe' template filter: when 'safe' is applied during variable expansion, every subsequent pipeline stage on the same string inherits the 'safe' designation, so attacker-controlled data that should be escaped is passed through unescaped. Because variable expansion is used to build authentication backend queries, this enables SQL or LDAP injection by remote unauthenticated attackers. There is no public exploit identified at time of analysis, and EPSS exploitation probability is negligible (0.01%, 2nd percentile). | CRITICAL | 9.1 | 0.0% | 46 |
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| CVE-2026-24031 | Authentication bypass and user enumeration in OX Dovecot Pro (versions up to and including 3.1.0 and the 2.4.x line up to 2.4.0) lets remote attackers log in as any user when an administrator has cleared the auth_username_chars setting. The flaw is a CWE-89 SQL injection in the SQL-backed authentication driver: with input character filtering disabled, attacker-controlled username data reaches the SQL auth query unsanitized, enabling both full authentication bypass and account enumeration. Reported by OX and tracked as EUVD-2026-16561; no public exploit is identified at time of analysis, and CISA SSVC rates exploitation as none while assessing technical impact as total. | HIGH | 8.2 | 0.1% | 41 |
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| CVE-2026-27860 | Open-Xchange Dovecot Pro contains an LDAP filter injection vulnerability in its authentication module that allows remote unauthenticated attackers to inject arbitrary LDAP filters when the auth_username_chars configuration parameter is left empty, potentially enabling authentication bypass and reconnaissance of LDAP directory structures. The vulnerability carries a low CVSS score of 3.7 due to high attack complexity requirements, and no public exploit code has been identified at the time of analysis. | LOW | 3.7 | 0.0% | 39 |
PoC
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| CVE-2026-33605 | ManageSieve login process in OX Dovecot CE and Pro crashes on receipt of a small malformed pre-authentication command, enabling unauthenticated denial of service against Sieve script management. The blast radius is mode-dependent: high-security mode (CE community default) limits disruption to the attacker's own connection, whereas high-performance mode (Pro default) terminates all connections sharing the same managesieve-login process, making repeated attacks an effective targeted DoS. No public exploit code exists and no CISA KEV listing is present, but the unauthenticated network vector with low complexity makes this straightforward to trigger. | HIGH | 7.5 | 0.4% | 38 |
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| CVE-2026-42391 | Denial of service in OX Dovecot Pro and OX Dovecot CE allows unauthenticated remote attackers to exhaust memory and CPU on the imap-login process by sending an IMAP ID command with an excessive number of parameters before completing authentication. When the out-of-memory handler terminates the affected imap-login process, all other IMAP connections multiplexed on that same process are simultaneously dropped, amplifying the impact beyond the single malicious session. No public exploits are known, but the low attack complexity and zero authentication requirement make this a practical DoS vector against any internet-exposed OX Dovecot deployment. | HIGH | 7.5 | 0.4% | 38 |
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| CVE-2026-27852 | Memory exhaustion in OX Dovecot Pro and OX Dovecot CE allows any remote sender to deny IMAP service to a targeted user by crafting an email whose headers contain an abnormally large number of addresses or MIME parameters. The malicious message passes delivery intact, but when the recipient's IMAP process parses it, uncontrolled memory allocation causes the process to hit its memory limit and terminate, interrupting that user's IMAP session. No public exploits are known and CISA has not added this to the KEV catalog, but the low attack complexity and lack of authentication requirements make this a realistic nuisance-level threat for any Dovecot deployment. | HIGH | 7.5 | 0.4% | 38 |
|
| CVE-2025-59032 | OX Dovecot Pro ManageSieve service crashes when processing AUTHENTICATE commands with SASL initial responses using literal format, enabling unauthenticated remote attackers to repeatedly crash the service and deny availability to legitimate users (CVSS 7.5, High availability impact). The vulnerability affects OX Dovecot Pro installations with ManageSieve enabled. No public exploit identified at time of analysis, and EPSS data was not provided in available intelligence. | HIGH | 7.5 | 0.1% | 38 |
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| CVE-2026-27858 | OX Dovecot Pro managesieve-login process crashes repeatedly due to memory exhaustion triggered by unauthenticated attackers sending crafted messages. The vulnerability enables remote denial of service against the managesieve protocol without authentication (CVSS:3.1/AV:N/AC:L/PR:N/UI:N), with a CVSS score of 7.5 (High severity). No public exploit identified at time of analysis, and the vendor has released a security advisory with remediation guidance. | HIGH | 7.5 | 0.0% | 38 |
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| CVE-2026-27857 | Remote memory-exhaustion denial of service in OX Dovecot Pro (versions up to and including 2.3.0) lets an unauthenticated network attacker exhaust process memory by sending NOOP commands containing thousands of nested parentheses. Each such command consumes roughly 1 MB, and by withholding the terminating line-feed the attacker keeps the allocation alive; ~1000 concurrent connections from even a single source IP can pin around 1 GB, breaching the process VSZ limit and killing the service along with its proxied connections. There is no public exploit identified at time of analysis (EPSS 0.04%, percentile 12; CISA SSVC exploitation=none), but the vector is trivial and a vendor patch is available. | HIGH | 7.5 | 0.0% | 38 |
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| CVE-2026-40018 | SQL injection in Open-Xchange OX Dovecot Pro and OX Dovecot CE enables unauthenticated remote attackers, under high-complexity conditions, to read and manipulate backend database contents - yielding high confidentiality and integrity impact with no availability disruption. Both the commercial (Pro) and community (CE) editions of the OX-branded Dovecot mail server are confirmed affected per vendor CPE data and the OX advisory OXDC-ADV-2026-0003. No public exploit code has been identified at time of analysis, and the AC:H vector indicates exploitation is non-trivial and likely requires specific environmental or protocol conditions. | HIGH | 7.4 | 0.3% | 37 |
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| CVE-2026-73208 | OAuth2 token validation in OX Dovecot Pro and OX Dovecot CE contains a logic error that permits authentication bypass when the identity provider omits the scope claim from token responses. Dovecot incorrectly falls back to evaluating the audience claim as a substitute for scope, accepting any token whose audience value coincidentally matches a configured scope name - regardless of what permissions that token actually grants. The flaw also silently masks IDP misconfigurations where scope issuance is entirely absent. No public exploit code has been identified and the vulnerability is not listed in CISA KEV, but the CVSS score of 7.4 (AV:N/AC:H) reflects that successful exploitation yields full confidentiality and integrity access to email. | HIGH | 7.4 | 0.3% | 37 |
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| CVE-2026-27855 | Dovecot OTP authentication enables replay attacks when authentication cache is enabled and username alteration occurs in passdb, allowing attackers who observe an OTP exchange to authenticate as the targeted user. Open-XChange Dovecot Pro is affected (CPE: cpe:2.3:a:open-xchange_gmbh:ox_dovecot_pro:*:*:*:*:*:*:*:*). No public exploit identified at time of analysis, though the vulnerability requires relatively specific preconditions (enabled cache, username modification in passdb) to be exploitable. The CVSS 6.8 score reflects high confidentiality and integrity impact but requires high attack complexity and user interaction. | MEDIUM | 6.8 | 0.0% | 34 |
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| CVE-2026-33603 | Man-in-the-middle attackers positioned between OX Dovecot Pro and clients can forge SCRAM TLS channel binding via specially crafted base64 exchanges, allowing eavesdropping on encrypted communications. The attack requires network-level access and knowledge of channel binding mechanics but yields complete confidentiality compromise. No public exploit code is known, and patched versions are available from Open-Xchange. | MEDIUM | 6.8 | 0.0% | 34 |
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| CVE-2026-52687 | IMAP compression in OX Dovecot Pro and OX Dovecot CE allows any authenticated user to exhaust the memory of the imap-login process by negotiating a memory-intensive decompression algorithm across multiple simultaneous connections. The process crashes after only a few such connections, terminating all sessions it manages and causing denial of service for all active IMAP users sharing that process. No public exploits are known and CISA KEV does not list this CVE, but the low prerequisite bar - any valid IMAP credential - makes it a meaningful risk in multi-tenant or hosted email environments. | MEDIUM | 6.5 | 0.3% | 33 |
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