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CVE-2021-42282 is an Active Directory Domain Services elevation-of-privilege vulnerability related to insufficient enforcement of uniqueness constraints for identity attributes such as User Principal Name (UPN), Service Principal Name (SPN), and SPN aliases across the forest. Microsoft introduced hardening for this issue in 2021 by adding new uniqueness verification checks for UPNs, SPNs, and SPN aliases. The available information indicates the flaw stems from improper handling of equivalent or ambiguous string representations in these attributes, allowing uniqueness protections to be bypassed under certain conditions. This weakness affects the integrity of account identity resolution in AD DS and can enable downstream abuse of Kerberos and directory object naming semantics.
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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.
If you can’t patch tonight, do this now.
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.
2 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A previously patched Active Directory vulnerability referenced because its fix introduced UPN/SPN/SPN-alias uniqueness checks that the newly described vulnerabilities bypass.
A Microsoft Active Directory-related vulnerability referenced as defining operating systems and updates relevant to the DoNotVerifyUPNAndOrSPNUniqueness heuristic.
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.