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CVE-2016-0762 is an observable timing discrepancy in Apache Tomcat Realm authentication implementations. In affected releases, when an authentication request supplied a nonexistent username, the Realm did not process the supplied password. Authentication handling therefore took measurably less time than it did for an existing username with an incorrect password, allowing an attacker to distinguish valid usernames through repeated timing measurements. Affected versions include Tomcat 9.0.0.M1 through 9.0.0.M9, 8.5.0 through 8.5.4, 8.0.0.RC1 through 8.0.36, 7.0.0 through 7.0.70, and 6.0.0 through 6.0.45.
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No public exploit code observed for this vulnerability.
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6 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
Username-enumeration vulnerability through timing differences in Tomcat Realm authentication handling.
A timing side-channel in Tomcat Realm implementations that may allow enumeration of valid usernames; the default LockOutRealm makes exploitation harder.
Apache Tomcat Realm implementations permitted timing-based username enumeration because password processing differed for nonexistent usernames.
Tomcat Realm authentication timing differences can allow user-name 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.