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KerberLoss is a privilege-escalation vulnerability in Active Directory Domain Services caused by improper restriction of names for directory-managed resources, specifically Service Principal Name values and related SPN alias handling. The flaw arises from Active Directory accepting certain invisible or unfilterable Unicode characters in identity-related attributes and failing to enforce effective uniqueness checks consistently when those characters are present. By inserting such characters into an SPN value, an attacker with permission to modify SPNs can bypass forest-wide SPN and SPN-alias uniqueness verification introduced to prevent naming collisions. This allows creation of conflicting or ambiguous SPN registrations that alter Kerberos service resolution behavior. Reported effects include causing the KDC to issue service tickets encrypted with the wrong account key for HOST-mapped services, abusing explicit-SPN precedence over mapped aliases in constrained delegation scenarios, and creating duplicate explicit SPNs that cause Kerberos service lookup failures and authentication downgrade conditions.
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No valid public exploits. Mallory filtered out 3 candidates as fakes, detection scripts, or README-only repos.
All candidate exploits were filtered out by Mallory's validation.
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Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
16 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
An Active Directory privilege escalation and identity-confusion vulnerability that abuses invisible/unfilterable Unicode characters to bypass SPN uniqueness and SPN alias uniqueness checks, enabling conflicting or duplicate SPNs that can cause DoS, NTLM downgrade, and support SPN-jacking style attacks.
An Active Directory Domain Services vulnerability that may allow SYSTEM-level privilege gain and could impact Kerberos authentication behavior, potentially disrupting services or forcing weaker fallback behavior.
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.