CVE-2025-59032 — Improper Input Validation in Dovecot

CWE-20 — Improper Input ValidationCWE-229 — Improper Handling of Values8 documents7 sources
Severity
7.5HIGHNVD
OSV5.3
EPSS
0.1%
top 78.76%
CISA KEV
Not in KEV
Exploit
No known exploits
Affected products
3
DovecotDebian DovecotOpen-xchange Gmbh OX Dovecot PRO
Timeline
PublishedMar 27
Latest updateMar 31

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.

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:HExploitability: 3.9 | Impact: 3.6

Affected Packages4 packages

▶debiandebian/dovecot< dovecot 1:2.3.19.1+dfsg1-2.1+deb12u2 (bookworm)
▶Debiandovecot/dovecot< 1:2.3.19.1+dfsg1-2.1+deb12u2+1
▶Ubuntudovecot/dovecot< 1:2.3.16+dfsg1-3ubuntu2.7+2

🔴Vulnerability Details

3
OSV
dovecot vulnerabilities↗2026-03-31
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OSV
CVE-2025-59032: ManageSieve AUTHENTICATE command crashes when using literal as SASL initial response↗2026-03-27
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GHSA
GHSA-w2gj-cmfm-c4j4: ManageSieve AUTHENTICATE command crashes when using literal as SASL initial response↗2026-03-27
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📋Vendor Advisories

3
Ubuntu
Dovecot vulnerabilities↗2026-03-31
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Red Hat
dovecot: ManageSieve: Denial of Service via crafted SASL initial response in AUTHENTICATE command↗2026-03-27
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Debian
CVE-2025-59032: dovecot - ManageSieve AUTHENTICATE command crashes when using literal as SASL initial resp...↗2025
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🕵️Threat Intelligence

1
Wiz
CVE-2025-59032 Impact, Exploitability, and Mitigation Steps | Wiz↗
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