EUVD-2026-16563
GHSA-7923-h3mf-4442
CVSS VectorNVD
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N
Lifecycle Timeline
4DescriptionNVD
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 known.
AnalysisAI
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:*:*:*:*:*:*:*:*). …
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RemediationAI
Within 30 days: Identify affected systems and apply vendor patches as part of regular patch cycle. Monitor vendor channels for patch availability.
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Vendor StatusVendor
Ubuntu
Priority: Medium| Release | Status | Version |
|---|---|---|
| trusty | needed | - |
| xenial | needed | - |
| bionic | needed | - |
| focal | needed | - |
| jammy | needed | - |
| noble | needed | - |
| questing | needed | - |
| upstream | released | 2.4.3 |
Debian
| Release | Status | Fixed Version | Urgency |
|---|---|---|---|
| bullseye | vulnerable | 1:2.3.13+dfsg1-2+deb11u1 | - |
| bullseye (security) | vulnerable | 1:2.3.13+dfsg1-2+deb11u2 | - |
| bookworm, bookworm (security) | vulnerable | 1:2.3.19.1+dfsg1-2.1+deb12u1 | - |
| trixie | vulnerable | 1:2.4.1+dfsg1-6+deb13u3 | - |
| trixie (security) | vulnerable | 1:2.4.1+dfsg1-6+deb13u1 | - |
| forky, sid | vulnerable | 1:2.4.2+dfsg1-4 | - |
| (unstable) | fixed | (unfixed) | - |
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External POC / Exploit Code
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