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Apache Tomcat contains an observable-discrepancy flaw in FORM authentication handling. In affected releases, improper error checking in the MemoryRealm, and in affected earlier versions of DataSourceRealm and JDBCRealm, produces distinguishable behavior when a malformed URL-encoded password is submitted during authentication. An unauthenticated remote attacker can use this behavior to determine whether a supplied username is valid.
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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.
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Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
9 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
Username enumeration through insufficient authentication error handling.
Username-enumeration information disclosure in FORM authentication realms.
An Apache Tomcat information-disclosure vulnerability that permits remote username enumeration when FORM authentication is enabled. Malformed URL encoding in the j_password parameter triggers improper error handling in the MemoryRealm, DataSourceRealm, and JDBCRealm authentication realms.
Authentication error-handling flaw allowing username enumeration.
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.