CVE-2025-59028
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.
- Dovecot
- < 2.4.3
- Open-xchange Dovecot
- < 3.1.2
- Fix
- Available
- CVSS 3.1
- 7.5 HIGH
- EPSS
- 0.4% (37th percentile)
- Weakness
- CWE-20
- NVD status
- Analyzed
- Published
- 2026-03-27
CVE-2025-59028 at NVD
No indexed exploits for CVE-2025-59028 yet
Our index is partial: it proves presence, never absence
No exploit for CVE-2025-59028 has been indexed yet. Our index is built from live traffic and upstream syncs, so this page can only say what it knows — not that no exploit exists.