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CVE-2025-59028

medium CVSS 5.3 EPSS 0.4%

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.

Versions it affects

Software versions checked with the free lookup that CVE-2025-59028 applies to, and the release that fixes it where the sources name one.

Dovecot 2.2.36

At a glance

Severity
Medium
CVSS base score
5.3 out of 10
Known exploited
Not in CISA's catalogue of exploited vulnerabilities
EPSS
0.4% probability of exploitation in the next 30 days, higher than 38% of scored vulnerabilities
Weakness
CWE-20
Published
2026-03-27
NVD CVE.org

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