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CVE-2025-59028 is an input validation flaw in Dovecot core affecting OX Dovecot Pro core 3.1.0 and OX Dovecot CE core 2.4.0. When a client sends invalid base64-encoded SASL authentication data, the login process can be disconnected from the auth server. Because active authentication sessions are multiplexed through that login/auth relationship, the fault causes all active concurrent authentication sessions handled by that process to fail. The issue therefore enables denial of service against concurrent login activity by supplying malformed BASE64 SASL input during authentication. The advisory identifies this as DOV-8349 and states that no publicly available exploits are known.
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What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.
What an attacker gets, and what they’ve been doing with it.
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Patch, then assume compromise.
No public exploits tracked yet. Mallory keeps watching.
No public exploit code observed for this vulnerability.
Products and vendors Mallory has correlated with this vulnerability. Open in Mallory to drill down to specific CPE configurations and version ranges.
Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
6 sources tracked across advisories and community write-ups. News coverage will land here when it surfaces.
No news coverage yet. Advisories and community discussion only.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.