CVE-2025-59028

EUVD-2025-209088
When sending invalid base64 SASL data, login process is disconnected from the auth server, causing all active authentication sessions to fail. Invalid BASE64 data can be used to DoS a vulnerable server to break concurrent logins. Install fixed version or disable concurrency in login processes (heavy perfomance penalty on large deployments). No publicly available exploits are known.
ProviderTypeBase ScoreAtk. VectorAtk. ComplexityPriv. RequiredVector
NISTPrimary
5.3 MEDIUM
NETWORK
LOW
NONE
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Base Score
CVSS 3.x
EPSS Score
Percentile: 16%
Affected Products (NVD)
VendorProductVersion
dovecotdovecot
𝑥
< 2.4.3
open-xchangedovecot
𝑥
< 3.1.2
𝑥
= Vulnerable software versions
Debian logo
Debian Releases
Debian Product
Codename
dovecot
bookworm
1:2.3.19.1+dfsg1-2.1+deb12u1
fixed
bookworm (security)
1:2.3.19.1+dfsg1-2.1+deb12u4
fixed
bullseye
1:2.3.13+dfsg1-2+deb11u1
fixed
bullseye (security)
1:2.3.13+dfsg1-2+deb11u3
fixed
forky
1:2.4.3+dfsg1-2
fixed
sid
1:2.4.3+dfsg1-2
fixed
trixie
vulnerable
trixie (security)
1:2.4.1+dfsg1-6+deb13u4
fixed
Ubuntu logo
Ubuntu Releases
Ubuntu Product
Codename
dovecot
bionic
not-affected
focal
not-affected
jammy
not-affected
noble
not-affected
questing
Fixed 1:2.4.1+dfsg1-5ubuntu4.1
released
trusty
not-affected
xenial
not-affected
Common Weakness Enumeration
Vulnerability Media Exposure
References
https://documentation.open-xchange.com/dovecot/security/advisories/csaf/2026/oxdc-adv-2026-0001.json