Dovecot
Dovecot 2.3
Dovecot 2.3
Third-party support for the Dovecot 2.3: 24/7 engineers manage issues, remediate vulnerabilities, and help you maintain compliance — independent of the vendor contract.
Issue Management
24/7 engineers own your Dovecot 2.3 incidents end to end.
Vulnerability Remediation
Mitigation and patch-around guidance when the vendor no longer ships fixes.
Compliance Maintenance
Controls evidence and documentation that keep auditors satisfied.
Specifications
- product
- dovecot
- release
- 2.3
- product Label
- Dovecot
- release Label
- 2.3
- codename
- lts
- latest Version
- 2.3.21.1
- release Date
- 2017-12-22
- maintained
- true
- source Url
- https://endoflife.date/dovecot
Lifecycle Dates
- Last OEM Support
- Jan 24, 2025
OEM vs. 3rd Party Support
See how third-party support compares to the vendor contract for Dovecot 2.3 — monitoring, break/fix, vulnerability work, operations and compliance, before and after EOSL.
| Feature | OEM Support | 3rd Party Support |
|---|---|---|
| Post-EOSL Support | ||
| Break/Fix Support | Until EOSL | |
| 24/7 Monitoring | ||
| Vulnerability Scanning & Remediation | ||
| Managed Operations | ||
| Procedure & Configuration Review | ||
| Compliance & Audit Documentation | Limited | |
| Discounted Migration to Other Platforms |
Why Choose 3rd Party Support for Dovecot 2.3?
Vulnerability Remediation
Scanning, mitigation and patch-around guidance for Dovecot 2.3 when the vendor no longer ships fixes.
Compliance Maintenance
Procedure review, controls evidence and the documentation auditors ask for — maintained continuously, not scrambled at audit time.
24/7 Expert Support
Engineers who know this release monitor, manage and fix issues around the clock — break/fix to managed operations.
Dovecot 2.3 Support: Frequently Asked Questions
Is the Dovecot 2.3 still supported?
Yes. The Dovecot 2.3 is currently supported by Dovecot, and third-party support is available as an alternative — issue management, vulnerability remediation, and compliance help independent of the vendor contract.
How much does third-party support for the Dovecot 2.3 cost?
Typically 40-70% below the OEM maintenance renewal price. Exact pricing depends on quantity, service level and location — request a quote and we respond within 24 hours.
Known Vulnerabilities Affecting Dovecot 2.3
34 published CVEs affect the Dovecot 2.3, including 16 rated critical or high severity. Our 24/7 engineers help you assess exposure, prioritize fixes and apply available patches.
| CVE | Severity | CVSS | Published | Summary |
|---|---|---|---|---|
| CVE-2019-11500 | CRITICAL | 9.8 | Aug 29, 2019 | In Dovecot before 2.2.36.4 and 2.3.x before 2.3.7.2 (and Pigeonhole before 0.5.7.2), protocol processing can fail for quoted strings. This occurs because '\0' characters are mishandled, and can lead to out-of-bounds writes and remote code execution. |
| CVE-2022-30550 | HIGH | 8.8 | Jul 17, 2022 | An issue was discovered in the auth component in Dovecot 2.2 and 2.3 before 2.3.20. When two passdb configuration entries exist with the same driver and args settings, incorrect username_filter and mechanism settings can be applied to passdb definitions. These incorrectly applied settings can lead to an unintended security configuration and can permit privilege escalation in certain configurations. The documentation does not advise against the use of passdb definitions that have the same driver |
| CVE-2019-7524 | HIGH | 8.8 | Mar 28, 2019 | In Dovecot before 2.2.36.3 and 2.3.x before 2.3.5.1, a local attacker can cause a buffer overflow in the indexer-worker process, which can be used to elevate to root. This occurs because of missing checks in the fts and pop3-uidl components. |
| CVE-2026-24031 | HIGH | 7.7 | Mar 27, 2026 | 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-2019-3814 | HIGH | 7.7 | Mar 27, 2019 | It was discovered that Dovecot before versions 2.2.36.1 and 2.3.4.1 incorrectly handled client certificates. A remote attacker in possession of a valid certificate with an empty username field could possibly use this issue to impersonate other users. |
| CVE-2026-27858 | HIGH | 7.5 | Mar 27, 2026 | 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-2025-59032 | HIGH | 7.5 | Mar 27, 2026 | 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-2020-25275 | HIGH | 7.5 | Jan 4, 2021 | Dovecot before 2.3.13 has Improper Input Validation in lda, lmtp, and imap, leading to an application crash via a crafted email message with certain choices for ten thousand MIME parts. |
| CVE-2020-12674 | HIGH | 7.5 | Aug 12, 2020 | In Dovecot before 2.3.11.3, sending a specially formatted RPA request will crash the auth service because a length of zero is mishandled. |
| CVE-2020-12673 | HIGH | 7.5 | Aug 12, 2020 | In Dovecot before 2.3.11.3, sending a specially formatted NTLM request will crash the auth service because of an out-of-bounds read. |
| CVE-2020-12100 | HIGH | 7.5 | Aug 12, 2020 | In Dovecot before 2.3.11.3, uncontrolled recursion in submission, lmtp, and lda allows remote attackers to cause a denial of service (resource consumption) via a crafted e-mail message with deeply nested MIME parts. |
| CVE-2020-10957 | HIGH | 7.5 | May 18, 2020 | In Dovecot before 2.3.10.1, unauthenticated sending of malformed parameters to a NOOP command causes a NULL Pointer Dereference and crash in submission-login, submission, or lmtp. |
| CVE-2019-10691 | HIGH | 7.5 | Apr 24, 2019 | The JSON encoder in Dovecot before 2.3.5.2 allows attackers to repeatedly crash the authentication service by attempting to authenticate with an invalid UTF-8 sequence as the username. |
| CVE-2017-15132 | HIGH | 7.5 | Jan 25, 2018 | A flaw was found in dovecot 2.0 up to 2.2.33 and 2.3.0. An abort of SASL authentication results in a memory leak in dovecot's auth client used by login processes. The leak has impact in high performance configuration where same login processes are reused and can cause the process to crash due to memory exhaustion. |
| CVE-2026-27851 | HIGH | 7.4 | May 12, 2026 | 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-2026-27856 | HIGH | 7.4 | Mar 27, 2026 | 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. |
| CVE-2026-33603 | MEDIUM | 6.8 | May 12, 2026 | 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-2026-27855 | MEDIUM | 6.8 | Mar 27, 2026 | Dovecot OTP authentication is vulnerable to replay attack under specific conditions. If auth cache is enabled, and username is altered in passdb, then OTP credentials can be cached so that same OTP reply is valid. An attacker able to observe an OTP exchange is able to log in as the user. If authentication happens over unsecure connection, switch to SCRAM protocol. Alternatively ensure the communcations are secured, and if possible switch to OAUTH2 or SCRAM. No publicly available exploits are kno |
| CVE-2020-24386 | MEDIUM | 6.8 | Jan 4, 2021 | An issue was discovered in Dovecot before 2.3.13. By using IMAP IDLE, an authenticated attacker can trigger unhibernation via attacker-controlled parameters, leading to access to other users' email messages (and path disclosure). |
| CVE-2026-40016 | MEDIUM | 5.3 | May 12, 2026 | 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. |
Showing the 20 most severe of 34 known CVEs.
Get Third Party SupportRelated Dovecot Products
All Dovecot products →Dovecot 2.3
Save 40-70% vs OEM