CVE-2025-59032
High
Description
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.
SeverityHigh
CVSS7.5
Exploit probability—
ProductDovecot
PublishedMar 27, 2026
First seenMar 27, 2026
Weakness typeCWE-20Improper input validation
How to fix
Update
- dovecot dovecot2.4.3 or later
- open-xchange dovecot3.1.3 or later
Vendor advisories
- documentation.open-xchange.com/dovecot/security/advisories/csaf/2026/oxdc-adv-2026-0001.json
- access.redhat.com/errata/RHSA-2026:26564
- access.redhat.com/errata/RHSA-2026:17602
- access.redhat.com/errata/RHSA-2026:13498
- access.redhat.com/errata/RHSA-2026:19149
- access.redhat.com/errata/RHSA-2026:13830
- access.redhat.com/errata/RHSA-2026:19455
- access.redhat.com/errata/RHSA-2026:19453
- access.redhat.com/errata/RHSA-2026:18053
- access.redhat.com/errata/RHSA-2026:17630
- access.redhat.com/errata/RHSA-2026:17628
- access.redhat.com/errata/RHSA-2026:17625
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| dovecot dovecot | v < 2.4.3 | 2.4.3 |
| open-xchange dovecot | v < 3.1.3 | 3.1.3 |
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