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CVE-2026-20833 is an information-disclosure vulnerability in Windows Kerberos caused by continued use of legacy or weak encryption types, notably RC4, for service-ticket issuance. A domain controller may issue a service ticket encrypted using RC4 for accounts that lack an explicit Active Directory Kerberos encryption-type configuration. An authorized attacker can obtain such tickets and conduct offline password-recovery attacks against the associated service-account credentials. Microsoft mitigates the condition by changing the default domain-controller Kerberos encryption behavior for unspecified accounts to AES-SHA1 encryption types and by phasing out default RC4 use.
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No valid public exploits. Mallory filtered out 2 candidates as fakes, detection scripts, or README-only repos.
All candidate exploits were filtered out by Mallory's validation.
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.
14 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A Samba vulnerability affecting interoperability with Windows Kerberos, fixed in Samba 4.25.0.
A Samba/Windows Kerberos compatibility vulnerability or issue addressed in Samba 4.25. The supplied content does not provide sufficient technical detail to determine the precise flaw type or impact.
A Samba vulnerability addressed in version 4.25.0 by changing the default Kerberos domain-supported encryption types to AES-128 and AES-256 for domains at functional level 2008 or higher.
A vulnerability associated with the Kerberos protocol in Windows Server 2025 that is addressed by changing the default DefaultDomainSupportedEncTypes value to AES-SHA1 for accounts without explicit Active Directory encryption type definitions.
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.